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DOCUMENT AND ENTITY INFORMATION - shares	9 Months Ended
DOCUMENT AND ENTITY INFORMATION - shares	Sep. 30, 2018	Nov. 02, 2018
Entity Registrant Name	IAC/INTERACTIVECORP
Entity Central Index Key	0000891103
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Emerging Growth Company	false
Small Business	false
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Amendment Flag	false
Common Class A
Entity Common Stock, Shares Outstanding		77,724,487
Class B Convertible Common Stock
Entity Common Stock, Shares Outstanding		5,789,499

CONSOLIDATED BALANCE SHEET (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 1,670,984	$ 1,630,809
Marketable securities	208,555	4,995
Accounts receivable, net of allowance of $19,835 and $11,489, respectively	347,158	304,027
Other current assets	246,197	185,374
Total current assets	2,472,894	2,125,205
Property and equipment, net of accumulated depreciation and amortization of $283,129 and $271,811, respectively	308,465	315,170
Goodwill	2,572,221	2,559,066
Intangible assets, net of accumulated amortization of $129,842 and $74,957, respectively	624,102	663,737
Long-term investments	217,615	64,977
Deferred income taxes	84,817	66,321
Other non-current assets	92,233	73,334
TOTAL ASSETS	6,372,347	5,867,810
LIABILITIES:
Current portion of long-term debt	13,750	13,750
Accounts payable, trade	76,193	76,571
Deferred revenue	381,397	342,483
Accrued expenses and other current liabilities	422,165	366,924
Total current liabilities	893,505	799,728
Long-term debt, net	1,983,993	1,979,469
Income taxes payable	25,241	25,624
Deferred income taxes	34,861	35,070
Other long-term liabilities	36,625	38,229
Redeemable noncontrolling interests	69,530	42,867
Commitments and contingencies
SHAREHOLDERS' EQUITY:
Additional paid-in capital	11,955,629	12,165,002
Retained earnings	1,067,042	595,038
Accumulated other comprehensive loss	(112,855)	(103,568)
Treasury stock 194,708 and 194,163 shares, respectively	(10,309,612)	(10,226,721)
Total IAC shareholders' equity	2,600,482	2,430,028
Noncontrolling interests	728,110	516,795
Total shareholders' equity	3,328,592	2,946,823
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	6,372,347	5,867,810
Common stock $.001 par value; authorized 1,600,000 shares; issued 262,040 and 260,624 shares, respectively, and outstanding 77,701 and 76,829 shares, respectively
SHAREHOLDERS' EQUITY:
Common stock	262	261
Class B convertible common stock $.001 par value; authorized 400,000 shares; issued 16,157 shares and outstanding 5,789 shares
SHAREHOLDERS' EQUITY:
Common stock	$ 16	$ 16

CONSOLIDATED BALANCE SHEET (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Allowance for accounts receivable	$ 19,835	$ 11,489
Accumulated depreciation and amortization of property and equipment	283,129	271,811
Accumulated amortization of intangible assets	$ 129,842	$ 74,957
Treasury stock (shares)	194,708,000	194,163,000
Common stock $.001 par value; authorized 1,600,000 shares; issued 262,040 and 260,624 shares, respectively, and outstanding 77,701 and 76,829 shares, respectively
Par value of common stock (USD per share)	$ 0.001	$ 0.001
Common stock authorized (shares)	1,600,000,000	1,600,000,000
Common stock issued (shares)	262,040,000	260,624,000
Common stock outstanding (shares)	77,701,000	76,829,000
Class B convertible common stock $.001 par value; authorized 400,000 shares; issued 16,157 shares and outstanding 5,789 shares
Par value of common stock (USD per share)	$ 0.001	$ 0.001
Common stock authorized (shares)	400,000,000	400,000,000
Common stock issued (shares)	16,157,000	16,157,000
Common stock outstanding (shares)	5,789,000	5,789,000

CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue	$ 1,104,592	$ 828,434	$ 3,158,789	$ 2,356,654
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	237,238	166,290	657,424	451,281
Selling and marketing expense	386,802	352,879	1,159,294	1,023,394
General and administrative expense	190,903	235,580	563,450	529,397
Product development expense	77,740	70,645	230,122	180,835
Depreciation	18,925	17,263	56,987	55,490
Amortization of intangibles	20,152	4,366	60,293	22,151
Total operating costs and expenses	931,760	847,023	2,727,570	2,262,548
Operating income (loss)	172,832	(18,589)	431,219	94,106
Interest expense	(27,610)	(25,036)	(81,471)	(74,556)
Other income (expense), net	8,113	(10,216)	174,635	(7,700)
Earnings (loss) before income taxes	153,335	(53,841)	524,383	11,850
Income tax benefit	18,242	279,480	15,887	322,809
Net earnings	171,577	225,639	540,270	334,659
Net earnings attributable to noncontrolling interests	(25,803)	(45,996)	(105,061)	(62,539)
Net earnings attributable to IAC shareholders	$ 145,774	$ 179,643	$ 435,209	$ 272,120
Per share information attributable to IAC shareholders:
Basic earnings per share (USD per share)	$ 1.75	$ 2.22	$ 5.22	$ 3.43
Diluted earnings per share (USD per share)	$ 1.49	$ 1.79	$ 4.55	$ 2.82
Stock-based compensation expense by function:
Stock-based compensation expense	$ 55,363	$ 134,472	$ 172,006	$ 207,362
Cost of revenue
Stock-based compensation expense by function:
Stock-based compensation expense	512	414	1,937	1,389
Selling and marketing expense
Stock-based compensation expense by function:
Stock-based compensation expense	1,837	20,970	5,679	24,420
General and administrative expense
Stock-based compensation expense by function:
Stock-based compensation expense	44,242	94,432	134,743	153,123
Product development expense
Stock-based compensation expense by function:
Stock-based compensation expense	$ 8,772	$ 18,656	$ 29,647	$ 28,430

CONSOLIDATED STATEMENT OF COMPREHENSIVE OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 171,577	$ 225,639	$ 540,270	$ 334,659
Other comprehensive income, net of tax:
Change in foreign currency translation adjustment	(1,050)	44,126	(12,233)	84,824
Change in unrealized gains and losses on available-for-sale securities (net of tax benefit of $4 for the three months ended September 30, 2018, and net of tax benefit of $3,846 for the nine months ended September 30, 2017)	(28)	0	(15)	(4,026)
Total other comprehensive (loss) income	(1,078)	44,126	(12,248)	80,798
Comprehensive income, net of tax	170,499	269,765	528,022	415,457
Components of comprehensive income attributable to noncontrolling interests:
Net earnings attributable to noncontrolling interests	(25,803)	(45,996)	(105,061)	(62,539)
Change in foreign currency translation adjustment attributable to noncontrolling interests	549	(6,901)	2,632	(14,188)
Comprehensive income attributable to noncontrolling interests	(25,254)	(52,897)	(102,429)	(76,727)
Comprehensive income attributable to IAC shareholders	$ 145,245	$ 216,868	$ 425,593	$ 338,730

CONSOLIDATED STATEMENT OF COMPREHENSIVE OPERATIONS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Tax provision (benefit) of change in unrealized gains and losses of available-for-sale securities	$ (4)	$ 0	$ 0	$ (3,846)

CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Redeemable Noncontrolling Interests	Total IAC Shareholders' Equity	Common Stock Common Stock $.001 Par Value	Common Stock Class B Convertible Common Stock $.001 Par Value	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interests	Match Group	Match Group Total IAC Shareholders' Equity	Match Group Additional Paid-in Capital	Match Group Accumulated Other Comprehensive Loss	Match Group Noncontrolling Interests	ANGI Homeservices	ANGI Homeservices Total IAC Shareholders' Equity	ANGI Homeservices Additional Paid-in Capital	ANGI Homeservices Accumulated Other Comprehensive Loss	ANGI Homeservices Noncontrolling Interests
Increase (Decrease) in Shareholders' Equity
Cumulative effect of adoption of ASU No. 2014-09	$ 40,205		$ 36,795				$ 36,795			$ 3,410
Balance at beginning of period at Dec. 31, 2017	42,867	$ 42,867
Increase (Decrease) in Redeemable Noncontrolling Interests
Net earnings		34,481
Other comprehensive loss, net of tax		(710)
Stock-based compensation expense		1,084
Purchase of noncontrolling interests		(3,562)
Adjustment of redeemable noncontrolling interests to fair value		(372)
Noncontrolling interests created in acquisitions		2,261														$ 14,246				$ 14,246
Other		(6,519)
Balance at end of period at Sep. 30, 2018	69,530	69,530
Balance at beginning of period at Dec. 31, 2017	2,946,823		2,430,028	$ 261	$ 16	$ 12,165,002	595,038	$ (103,568)	$ (10,226,721)	516,795
Balance at beginning of period (shares) at Dec. 31, 2017				260,624,000	16,157,000
Increase (Decrease) in Shareholders' Equity
Net earnings	505,789		435,209				435,209			70,580
Other comprehensive loss, net of tax	(11,538)		(9,616)					(9,616)		(1,922)
Stock-based compensation expense	170,922		52,763			52,763				118,159
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	34,903		34,903	$ 1		34,902
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (in shares)				1,416,000
Purchase of treasury stock	(82,891)		(82,891)						(82,891)
Purchase of noncontrolling interests	(1,236)									(1,236)
Adjustment of redeemable noncontrolling interests to fair value	372		372			372
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests											$ (268,113)	$ (269,802)	$ (270,149)	$ 347	$ 1,689	(23,542)	$ (29,548)	$ (29,530)	$ (18)	6,006
Noncontrolling interests created in acquisitions		$ 2,261														$ 14,246				$ 14,246
Other	2,652		2,269			2,269				383
Balance at end of period at Sep. 30, 2018	$ 3,328,592		$ 2,600,482	$ 262	$ 16	$ 11,955,629	$ 1,067,042	$ (112,855)	$ (10,309,612)	$ 728,110
Balance at end of period (shares) at Sep. 30, 2018				262,040,000	16,157,000

CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Parenthetical)	Sep. 30, 2018 $ / shares
Common Stock $.001 Par Value
Par value of common stock (USD per share)	$ 0.001
Class B Convertible Common Stock $.001 Par Value
Par value of common stock (USD per share)	0.001
Common Stock \| Common Stock $.001 Par Value
Par value of common stock (USD per share)	0.001
Common Stock \| Class B Convertible Common Stock $.001 Par Value
Par value of common stock (USD per share)	$ 0.001

CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net earnings	$ 540,270	$ 334,659
Adjustments to reconcile net earnings to net cash provided by operating activities:
Stock-based compensation expense	172,006	207,362
Amortization of intangibles	60,293	22,151
Depreciation	56,987	55,490
Bad debt expense	35,521	20,935
Deferred income taxes	(36,866)	(344,120)
Unrealized gains on equity securities, net	(126,444)	0
Gains from the sale of investments and businesses, net	(27,240)	(24,031)
Other adjustments, net	12,677	35,662
Changes in assets and liabilities, net of effects of acquisitions and dispositions:
Accounts receivable	(78,665)	(78,612)
Other assets	(48,935)	(17,326)
Accounts payable and other liabilities	57,891	36,407
Income taxes payable and receivable	1,971	4,433
Deferred revenue	52,234	44,791
Net cash provided by operating activities	671,700	297,801
Cash flows from investing activities:
Acquisitions, net of cash acquired	(17,635)	(69,113)
Capital expenditures	(60,113)	(56,519)
Proceeds from maturities and sales of marketable debt securities	125,000	114,350
Purchases of marketable debt securities	(326,906)	(24,909)
Purchases of investments	(32,180)	(9,105)
Net proceeds from the sale of investments and businesses	28,630	125,220
Other, net	9,646	1,319
Net cash (used in) provided by investing activities	(273,558)	81,243
Cash flows from financing activities:
Purchase of noncontrolling interests	(4,798)	(13,011)
Acquisition-related contingent consideration payments	(185)	(27,289)
Debt issuance costs	0	(2,637)
Other, net	(4,873)	(5,002)
Net cash used in financing activities	(359,856)	(492,800)
Total cash provided (used)	38,286	(113,756)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(207)	9,401
Net increase (decrease) in cash, cash equivalents, and restricted cash	38,079	(104,355)
Cash, cash equivalents, and restricted cash at beginning of period	1,633,682	1,360,199
Cash, cash equivalents, and restricted cash at end of period	1,671,761	1,255,844
Match Group and ANGI Homeservices
Cash flows from financing activities:
Proceeds from the exercise of stock options	2,876	57,705
Withholding taxes paid on behalf of employees on net settled stock-based awards	(208,962)	(228,978)
ANGI Homeservices
Cash flows from financing activities:
Principal payments on ANGI Homeservices debt	(10,313)	0
Match Group
Cash flows from financing activities:
Proceeds from issuance of Match Group debt	0	75,000
Purchase of treasury stock	(86,239)	0
Proceeds from the exercise of stock options		57,705
Withholding taxes paid on behalf of employees on net settled stock-based awards		(228,978)
Purchase of Match Group stock-based awards	0	(272,459)
IAC/InterActiveCorp
Cash flows from financing activities:
Repurchases of IAC debt	(363)	(31,590)
Purchase of treasury stock	(82,891)	(56,424)
Proceeds from the exercise of stock options	38,903	69,065
Withholding taxes paid on behalf of employees on net settled stock-based awards	$ (3,011)	$ (57,180)

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of Operations

IAC operates Vimeo, Dotdash, The Daily Beast and Investopedia, among many others, and also has majority ownership of both Match Group, which includes Tinder, Match, PlentyOfFish, and OkCupid, and ANGI Homeservices, which includes HomeAdvisor and Angie’s List.

All references to "IAC," the "Company," "we," "our" or "us" in this report are to IAC/InterActiveCorp.

As of September 30, 2018, IAC’s economic and voting interest in:


•	Match Group were 80.9%, and 97.5%, respectively. All references to "Match Group" or "MTCH" in this report are to Match Group, Inc.


•	ANGI Homeservices were 86.3%, and 98.4%, respectively. All reference to "ANGI Homeservices" or "ANGI" in this report are to ANGI Homeservices Inc.

Basis of Consolidation and Accounting for Investments

The Company prepares its consolidated financial statements in accordance with U.S. generally accepted accounting principles ("GAAP").

The consolidated financial statements include the accounts of the Company, all entities that are wholly-owned by the Company and all entities in which the Company has a controlling financial interest. Intercompany transactions and accounts have been eliminated.

Investments in the common stock or in-substance common stock of entities in which the Company has the ability to exercise significant influence over the operating and financial matters of the investee, but does not have a controlling financial interest, are accounted for using the equity method and are included in "Long-term investments" in the accompanying consolidated balance sheet.

Investments in equity securities, other than those of our consolidated subsidiaries and those accounted for under the equity method, are accounted for at fair value or under the measurement alternative of Financial Accounting Standards Board ("FASB") issued Accounting Standards Update (“ASU”) No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, upon its adoption on January 1, 2018, with changes recognized within other income (expense), net each reporting period. Under the measurement alternative, equity investments without readily determinable fair values are carried at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer and value is generally determined based on a market approach as of the transaction date. An investment will be considered identical or similar if it has identical or similar rights to the equity investments held by the Company. The Company reviews impairment of our equity securities each reporting period when there are qualitative indicators that may indicate impairment. Once the qualitative indicators are identified and the fair value of the security is less than its carrying value, the Company will write down the security to its fair value and record the corresponding charge within other income (expense), net. See "Accounting Pronouncements adopted by the Company" below for further information.

In management's opinion, the unaudited interim consolidated financial statements have been prepared on the same basis as the annual consolidated financial statements and reflect all adjustments, consisting of normal and recurring adjustments, necessary for the fair presentation of our financial position, results of operations and cash flows for the periods presented. Interim results are not necessarily indicative of the results that may be expected for the full year. The accompanying unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2017.

Accounting Estimates

Management of the Company is required to make certain estimates, judgments and assumptions during the preparation of its consolidated financial statements in accordance with GAAP. These estimates, judgments and assumptions impact the reported amounts of assets, liabilities, revenue and expenses and the related disclosure of contingent assets and liabilities. Actual results could differ from these estimates.

On an ongoing basis, the Company evaluates its estimates and judgments, including those related to: the recoverability of goodwill and indefinite-lived intangible assets; the useful lives and recoverability of definite-lived intangible assets and property and equipment; the fair values of marketable debt securities and equity securities without readily determinable fair values; the carrying value of accounts receivable, including the determination of the allowance for doubtful accounts; the determination of revenue reserves; the fair value of acquisition-related contingent consideration arrangements; unrecognized tax benefits; the valuation allowance for deferred income tax assets; and the fair value of and forfeiture rates for stock-based awards, among others. The Company bases its estimates and judgments on historical experience, its forecasts and budgets and other factors that the Company considers relevant.

Certain Risks and Concentrations

A meaningful portion of the Company's revenue is derived from online advertising, the market for which is highly competitive and rapidly changing. Significant changes in this industry or changes in advertising spending behavior or in customer buying behavior could adversely affect our operating results. Most of the Company's online advertising revenue is attributable to a services agreement with Google Inc. ("Google").

The services agreement became effective on April 1, 2016, following the expiration of the previous services agreement, and expires on March 31, 2020; however, the Company may choose to terminate the agreement effective March 31, 2019. The services agreement requires that the Company comply with certain guidelines promulgated by Google. Google may generally unilaterally update its policies and guidelines without advance notice, which could in turn require modifications to, or prohibit and/or render obsolete certain of our products, services and/or business practices, which could be costly to address or otherwise have an adverse effect on our business, financial condition and results of operations. Google’s previously announced policy changes related to its Chrome browser became effective on September 12, 2018 and negatively impacted the distribution of our desktop products through the Chrome Web Store. The impact of these changes on revenue and profits in the third quarter of 2018 were modest as the Company optimized marketing spend in anticipation of the changes. While these changes will reduce revenue and profits of these products in the future, the negative effect on overall Applications revenue and profits are expected to be partially offset by marketing optimization and growth at our Mobile businesses. The estimated fair value of the Applications reporting unit exceeded its carrying value by approximately 5% and the fair value of the related intangible asset approximated its carrying value as of our most recent assessment. As of September 30, 2018, the goodwill balance of the Applications reporting unit and the carrying value of the related intangible asset are $460.1 million and $56.6 million, respectively.

For the three and nine months ended September 30, 2018, revenue earned from Google was $204.4 million and $620.7 million, representing 19% and 20%, respectively, of the Company's consolidated revenue. For the three and nine months ended September 30, 2017, revenue earned from Google was $176.8 million and $539.2 million, representing 21% and 23%, respectively, of the Company's consolidated revenue. This revenue is earned principally by the businesses comprising the Applications and Publishing segments. For the three and nine months ended September 30, 2018, revenue earned from Google represents 72% and 76%, respectively, of Applications revenue and 67% and 71%, respectively, of Publishing revenue. For the three and nine months ended September 30, 2017, revenue earned from Google represents 82% and 83% of Applications revenue and 72% and 71% of Publishing revenue. Accounts receivable related to revenue earned from Google totaled $73.1 million and $72.4 million at September 30, 2018 and December 31, 2017, respectively.

Recent Accounting Pronouncements

Accounting Pronouncements adopted by the Company

ASU No. 2014-09, Revenue from Contracts with Customers

In May 2014, the FASB issued ASU No. 2014-09, which superseded nearly all previous revenue recognition guidance. The Company adopted ASU No. 2014-09 effective January 1, 2018 using the modified retrospective transition method for open contracts as of the date of initial application. The cumulative effect to the Company's retained earnings at January 1, 2018 was an increase of $40.2 million, of which $3.4 million was related to the noncontrolling interest in ANGI; the adjustment to retained earnings was principally related to the Company’s ANGI Homeservices and Applications segments.

•

Within ANGI, the effect of the adoption of ASU No. 2014-09 is that commissions paid to employees pursuant to certain sales incentive programs, which represent the incremental direct costs of obtaining a service professional contract, are now capitalized and amortized over the estimated life of a service professional (also referred to as the estimated customer relationship period). These costs were expensed as incurred prior to January 1, 2018. The cumulative effect of the adoption of ASU No. 2014-09 was the establishment of a current and non-current asset for capitalized sales commissions of $29.7 million and $4.2 million, respectively, and a related deferred tax liability of $8.0 million, resulting in a net increase to retained earnings of $25.9 million on January 1, 2018.

•

Within Applications, the primary effect of the adoption of ASU No. 2014-09 is to accelerate the recognition of the portion of the revenue of certain desktop applications sold by SlimWare that qualifies as functional intellectual property ("functional IP") under ASU No. 2014-09. This revenue was previously deferred and recognized over the applicable subscription term. The cumulative effect of the adoption of ASU No. 2014-09 for SlimWare was a reduction in deferred revenue of $20.3 million and the establishment of a deferred tax liability of $4.9 million, resulting in a net increase to retained earnings of $15.5 million on January 1, 2018.

The adoption of ASU No. 2014-09 will not have a material effect on the Company’s results of operations or cash flows for the year ending December 31, 2018. See "Note 2—Revenue Recognition" for additional information on the impact to the Company.

The Company's disaggregated revenue disclosures are presented in "Note 9—Segment Information."

The following tables present the impact of the adoption of ASU No. 2014-09 by segment under Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers, as reported, and ASC 605, Revenue Recognition, for the three and nine months ended September 30, 2018.



	Three Months Ended September 30, 2018									Nine Months Ended September 30, 2018
	Under ASC 606 (as reported)			Under ASC 605			Effect of adoption of ASU No. 2014-09			Under ASC 606 (as reported)			Under ASC 605			Effect of adoption of ASU No. 2014-09
	(In thousands)
Revenue by segment:
Match Group	$	443,943		$	443,943		$	—		$	1,272,506		$	1,272,506		$	—
ANGI Homeservices	303,116			303,116			—			853,249			853,249			—
Video	64,193			64,440			(247		)	193,112			194,049			(937		)
Applications	153,973			153,863			110			429,034			429,118			(84		)
Publishing	139,439			139,439			—			411,116			411,116			—
Inter-segment eliminations	(72		)	(72		)	—			(228		)	(228		)	—
Total	$	1,104,592		$	1,104,729		$	(137	)	$	3,158,789		$	3,159,810		$	(1,021	)



	Three Months Ended September 30, 2018							Nine Months Ended September 30, 2018
	Under ASC 606 (as reported)		Under ASC 605		Effect of adoption of ASU No. 2014-09			Under ASC 606 (as reported)		Under ASC 605		Effect of adoption of ASU No. 2014-09
	(In thousands)
Operating costs and expenses by segment:
Match Group	$	304,048	$	304,048	$	—		$	870,213	$	870,213	$	—
ANGI Homeservices	269,601		269,352		249			807,228		815,190		(7,962		)
Video	74,443		74,756		(313		)	234,219		234,941		(722		)
Applications	120,932		119,962		970			337,455		335,184		2,271
Publishing	122,041		122,041		—			365,100		365,100		—
Corporate	40,695		40,695		—			113,355		113,355		—
Total	$	931,760	$	930,854	$	906		$	2,727,570	$	2,733,983	$	(6,413	)



	Three Months Ended September 30, 2018									Nine Months Ended September 30, 2018
	Under ASC 606 (as reported)			Under ASC 605			Effect of adoption of ASU No. 2014-09			Under ASC 606 (as reported)			Under ASC 605			Effect of adoption of ASU No. 2014-09
	(In thousands)
Operating income (loss) by segment:
Match Group	$	139,895		$	139,895		$	—		$	402,293		$	402,293		$	—
ANGI Homeservices	33,515			33,764			(249		)	46,021			38,059			7,962
Video	(10,250		)	(10,316		)	66			(41,107		)	(40,892		)	(215		)
Applications	33,041			33,901			(860		)	91,579			93,934			(2,355		)
Publishing	17,398			17,398			—			46,016			46,016			—
Corporate	(40,767		)	(40,767		)	—			(113,583		)	(113,583		)	—
Total	$	172,832		$	173,875		$	(1,043	)	$	431,219		$	425,827		$	5,392



	Three Months Ended September 30, 2018							Nine Months Ended September 30, 2018
	Under ASC 606 (as reported)		Under ASC 605		Effect of adoption of ASU No. 2014-09			Under ASC 606 (as reported)		Under ASC 605		Effect of adoption of ASU No. 2014-09
	(In thousands)
Net earnings	$	171,577	$	172,235	$	(658	)	$	540,270	$	536,119	$	4,151

ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities

In January 2016, the FASB issued ASU No. 2016-01, which updates certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. Under ASU No. 2016-01, equity securities, other than those of our consolidated subsidiaries and those accounted for under the equity method, will be measured at fair value with changes in fair value recognized in the statement of operations each reporting period. ASU No. 2016-01 is effective for reporting periods beginning after December 15, 2017. There was no cumulative impact to the Company's consolidated financial statements upon adoption of ASU No. 2016-01 on January 1, 2018. The adoption of ASU No. 2016-01 increases the volatility of the Company's other income (expense), net as a result of the remeasurement of these instruments. For the three months ended September 30, 2018, other income, net includes an unrealized loss related to an equity security of $0.1 million. For the nine months ended September 30, 2018, other income, net includes net unrealized gains related to certain equity securities that were adjusted to fair value in the second quarter of 2018 in accordance with ASU No. 2016-01 of $126.4 million. See "Note 5—Financial Instruments" for additional information.

ASU No. 2016-18, Restricted Cash

In November 2016, the FASB issued ASU No. 2016-18, which requires companies to explain the changes in the total of cash, cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flows. Therefore, amounts generally described as restricted cash or restricted cash equivalents are combined with unrestricted cash and cash equivalents when reconciling the beginning and end of period balances on the statement of cash flows. ASU No. 2016-18 also requires companies to disclose the nature of their restricted cash and restricted cash equivalents balances. Additionally, when cash, cash equivalents, restricted cash, and restricted cash equivalents are presented within different captions on the balance sheet, a reconciliation of the totals in the statement of cash flows to the related captions in the balance sheet is required. ASU No. 2016-18 is effective for reporting periods beginning after December 15, 2017. The Company's adoption of ASU No. 2016-18 effective January 1, 2018, on a retrospective basis, did not have a material effect on its consolidated financial statements.

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheet to the total amounts shown in the consolidated statement of cash flows:



	September 30, 2018		December 31, 2017		September 30, 2017		December 31, 2016
	(In thousands)
Cash and cash equivalents	$	1,670,984	$	1,630,809	$	1,255,317	$	1,329,187
Restricted cash included in other current assets	344		2,873		527		20,464
Restricted cash included in other assets	433		—		—		10,548
Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows	$	1,671,761	$	1,633,682	$	1,255,844	$	1,360,199

Restricted cash at December 31, 2017 primarily supports a letter of credit to a supplier, which was released to the Company in the second quarter of 2018.

Restricted cash at December 31, 2016 primarily included funds held in escrow for the redemption and repurchase of IAC Senior Notes and the MyHammer tender offer. In the first quarter of 2017, the Senior Notes were redeemed and repurchased and the funds held in escrow for the MyHammer tender offer were returned to the Company.

ASU No. 2018-07, Improvements to Nonemployee Share-Based Payment Accounting

In June 2018, the FASB issued ASU No. 2018-07, which largely aligns the measurement and classification guidance for share-based payments granted to non-employees with the guidance for share-based payments granted to employees. The new guidance supersedes Subtopic 505-50, Equity - Equity-Based payments to Nonemployees. ASU No. 2018-07 is effective for reporting periods beginning after December 15, 2018, with early adoption permitted. The Company adopted ASU No. 2018-07 effective April 1, 2018 and its adoption did not have a material effect on its consolidated financial statements. The effect of the adoption of ASU No. 2018-07 will be to minimize the volatility of expense related to stock-based awards to non-employees in the future.

Accounting Pronouncement not yet adopted by the Company

ASU No. 2016-02, Leases (Topic 842)

In February 2016, the FASB issued ASU No. 2016-02, which supersedes existing guidance on accounting for leases and generally requires all leases to be recognized in the statement of financial position. The provisions of ASU No. 2016-02 are effective for reporting periods beginning after December 15, 2018. The Company will adopt the new lease guidance effective January 1, 2019. In July 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, which provides the option of an additional transition method that allows entities to initially apply the new lease guidance at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company expects to implement the transition method option provided by ASU No. 2018-11.

The Company is not a lessor, has no capitalized leases and does not expect to enter into any capitalized leases prior to the adoption of ASU No. 2016-02. Accordingly, the Company does not expect the amount or classification of rent expense in its statement of operations to be affected by the adoption of ASU No. 2016-02. The primary effect of the adoption of ASU No. 2016-02 will be the recognition of a right of use asset and related liability to reflect the Company's rights and obligations under its operating leases. The Company will also be required to provide the additional disclosures stipulated in ASU No. 2016-02.

The adoption of ASU No. 2016-02 will not have an impact on the leverage calculation set forth in any of the agreements governing the outstanding debt of the Company or its MTCH and ANGI subsidiaries, or our credit agreement or the credit agreement of MTCH because, in each circumstance, the leverage calculations are not affected by the liability that will be recorded upon adoption of the new standard.

While the Company's evaluation of the impact of the adoption of ASU No. 2016-02 on its consolidated financial statements continues, outlined below is a summary of the status of the Company's progress:


•	the Company has selected a software solution to implement ASU No. 2016-02;


•	the Company has input lease summaries into the software solution;


•	the Company is assessing the other inputs required in connection with the adoption of ASU No. 2016-02; and


•	the Company is developing its accounting policy, procedures and internal controls related to the new standard.

Development of our selected software solution is ongoing, as it is not yet fully compliant with the requirements of ASU No. 2016-02. The timely readiness of the software solution is critical to ensure an efficient and effective adoption of ASU No. 2016-02. The Company's ability to calculate an estimate of the right of use asset and related liability is dependent upon the readiness of the software solution.

Reclassifications

Certain prior year amounts have been reclassified to conform to the current year presentation.

REVENUE RECOGNITION	9 Months Ended
REVENUE RECOGNITION	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
REVENUE RECOGNITION	REVENUE RECOGNITION General Revenue Recognition The Company accounts for a contract when it has approval and commitment from all parties, the rights of the parties and payment terms are identified, the contract has commercial substance and collectability of consideration is probable. Revenue is recognized when control of the promised services or goods is transferred to our customers, and in an amount that reflects the consideration the Company is contractually due in exchange for those services or goods. Match Group Match Group revenue is primarily derived directly from users in the form of recurring subscriptions. Subscription revenue is presented net of credits and credit card chargebacks. Subscribers pay in advance, primarily by credit card or through mobile app stores, and, subject to certain conditions identified in our terms and conditions, generally all purchases are final and nonrefundable. Revenue is initially deferred and is recognized using the straight-line method over the term of the applicable subscription period, which primarily range from one to six months. Revenue is also earned from online advertising, the purchase of à la carte features and offline events. Online advertising revenue is recognized when an advertisement is displayed. Revenue from the purchase of à la carte features is recognized based on usage. Revenue associated with offline events is recognized when each event occurs. ANGI Homeservices ANGI revenue is primarily derived from (i) consumer connection revenue, which comprises fees paid by service professionals for consumer matches (regardless of whether the professional ultimately provides the requested service), and (ii) membership subscription fees paid by service professionals. Consumer connection revenue varies based upon several factors, including the service requested, type of match and geographic location of service. The Company’s consumer connection revenue is generated and recognized when an in-network service professional is delivered a consumer match. Membership subscription revenue from service professionals is initially deferred and is recognized using the straight-line method over the applicable subscription period, which is typically one year. Consumer connection revenue is generally billed one week following a consumer match, with payment due upon receipt of invoice. ANGI revenue is also derived from Angie's List (i) sales of time-based website, mobile and call center advertising to service professionals and (ii) membership subscription fees from consumers. Angie's List service professionals generally pay for advertisements in advance on a monthly or annual basis at the option of the service professional, with the average advertising contract term being approximately one year. Angie's List website, mobile and call center advertising revenue is recognized ratably over the contract term. Revenue from the sale of advertising in the Angie’s List Magazine is recognized in the period in which the publication is distributed. Angie's List prepaid consumer membership subscription fees are recognized as revenue using the straight-line method over the term of the applicable subscription period, which is typically one year. Video Revenue of businesses in this segment is generated primarily through subscriptions, media production and distribution, and advertising. Subscription fee revenue is recognized over the terms of the applicable subscription period, which are one month or one year, production revenue is recognized when control is transferred to the customer to broadcast or exhibit, and advertising revenue is recognized when an advertisement is displayed or over the advertising period. Applications Applications revenue largely consists of advertising revenue generated principally through the display of paid listings in response to search queries. The substantial majority of the paid listings displayed by our Applications businesses are supplied to us by Google pursuant to our services agreement with Google. Pursuant to this agreement, those of our Applications businesses that provide search services transmit search queries to Google, which in turn transmits a set of relevant and responsive paid listings back to these businesses for display in search results. This ad-serving process occurs independently of, but concurrently with, the generation of algorithmic search results for the same search queries. Google paid listings are displayed separately from algorithmic search results and are identified as sponsored listings on search results pages. Paid listings are priced on a price per click basis and when a user submits a search query through one of our Applications businesses and then clicks on a Google paid listing displayed in response to the query, Google bills the advertiser that purchased the paid listing directly and shares a portion of the fee charged to the advertiser with us. The Company recognizes paid listing revenue from Google when it delivers the user's click. In cases where the user’s click is generated due to the efforts of a third-party distributor, we recognize the amount due from Google as revenue and record a revenue share or other payment obligation to the third-party distributor as traffic acquisition costs. To a lesser extent, Applications revenue also consists of fees related to subscription downloadable desktop and mobile applications as well as display advertisements. Fees related to subscription downloadable desktop and paid mobile applications are generally recognized at the time of the sale when the software license is delivered. To the extent updates or maintenance is required or expected, revenue is recognized over the term of the applicable subscription period, which is primarily one or two years. Fees related to display advertisements are recognized when an advertisement is displayed. Publishing Publishing revenue consists principally of advertising revenue, which is generated primarily through the display of paid listings in response to search queries and display advertisements (sold directly and through programmatic ad sales). The majority of the paid listings that our Publishing businesses display are supplied to us by Google in the manner, and pursuant to the services agreement with Google, described above under "Applications." Transaction Price The objective of determining the transaction price is to estimate the amount of consideration the Company is due in exchange for its services or goods, including amounts that are variable. The Company determines the total transaction price, including an estimate of any variable consideration, at contract inception and reassesses this estimate each reporting period. The Company excludes from the measurement of transaction price all taxes assessed by governmental authorities that are both (i) imposed on and concurrent with a specific revenue-producing transaction and (ii) collected from customers. Accordingly, such tax amounts are not included as a component of revenue or cost of revenue. For contracts that have an original duration of one year or less, the Company uses the practical expedient available under ASU No. 2014-09 applicable to such contracts and does not consider the time value of money. Accounts Receivables, net of allowance for doubtful accounts and revenue reserves Accounts receivable include amounts billed and currently due from customers. The Company maintains an allowance for doubtful accounts to provide for the estimated amount of accounts receivables that will not be collected. The allowance for doubtful accounts is based upon a number of factors, including the length of time accounts receivable are past due, the Company’s previous loss history and the specific customer’s ability to pay its obligation. The time between the Company issuance of an invoice and payments due date is not significant; customer payments that are not collected in advance of the transfer of promised services or goods are generally due no later than 30 days from invoice date. The Company also maintains allowances to reserve for potential credits issued to consumers or other revenue adjustments. The amounts of these reserves are based primarily upon historical experience. Deferred Revenue Deferred revenue consists of advance payments that are received or due in advance of the Company's performance. The Company’s deferred revenue is reported on a contract by contract basis at the end of each reporting period. The Company generally classifies deferred revenue as current when the term of the applicable subscription period or expected completion of our performance obligation is one year or less. The deferred revenue balance as of January 1, 2018 is $332.2 million. During the nine months ended September 30, 2018, the Company recognized $317.2 million of revenue that was included in the deferred revenue balance as of January 1, 2018. The deferred revenue balance as of June 30, 2018 is $377.2 million. During the three months ended September 30, 2018, the Company recognized $220.4 million of revenue that was included in the deferred revenue balance as of July 1, 2018. The current and non-current deferred revenue balances at September 30, 2018 are $381.4 million and $1.8 million, respectively. Non-current deferred revenue is included in “Other long-term liabilities” in the accompanying consolidated balance sheet. Arrangements with Multiple Performance Obligations The Company’s contracts with customers may include multiple performance obligations. For such arrangements, the Company allocates revenue to each performance obligation based on its relative standalone selling price. The Company generally determines standalone selling prices based on the prices charged to customers, which are directly observable or based on an estimate if not directly observable. For our multiple performance obligation arrangements that include functional intellectual property ("IP"), which comprise the downloadable apps and software of the Applications segment, the Company uses a residual approach to determine standalone selling prices for the functional IP. Assets Recognized from the Costs to Obtain a Contract with a Customer The Company has determined that certain costs, primarily commissions paid to employees pursuant to certain sales incentive programs and mobile app store fees, meet the requirements to be capitalized as a cost of obtaining a contract. Commissions paid to employees pursuant to certain sales incentive programs are amortized over the estimated customer relationship period. The Company calculates the estimated customer relationship period as the average customer life, which is based on historical data. When customer renewals are expected and the renewal commission is not commensurate with the initial commission, the average customer life includes renewal periods. For sales incentive programs where the customer relationship period is one year or less, the Company has elected the practical expedient to expense the costs as incurred. The Company generally capitalizes and amortizes mobile app store fees over the term of the applicable subscription. During the three and nine months ended September 30, 2018, the Company recognized expense of $94.4 million and $254.3 million, respectively, related to the amortization of these costs. The current and non-current contract asset balances at September 30, 2018 are $69.9 million and $5.6 million, respectively. The current and non-current contract assets are included in “Other current assets” and "Other non-current assets," respectively, in the accompanying consolidated balance sheet. Performance Obligations As permitted under the practical expedient available under ASU No. 2014-09, the Company does not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less, (ii) contracts with variable consideration that is allocated entirely to unsatisfied performance obligations or to a wholly unsatisfied promise accounted for under the series guidance, and (iii) contracts for which the Company recognizes revenue at the amount which we have the right to invoice for services performed.

INCOME TAXES	9 Months Ended
INCOME TAXES	Sep. 30, 2018
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES At the end of each interim period, the Company makes its best estimate of the annual expected effective income tax rate and applies that rate to its ordinary year-to-date earnings or loss. The income tax provision or benefit related to significant, unusual, or extraordinary items, if applicable, that will be separately reported or reported net of their related tax effects are individually computed and recognized in the interim period in which they occur. In addition, the effect of changes in enacted tax laws or rates, tax status, judgment on the realizability of a beginning-of-the-year deferred tax asset in future years or unrecognized tax benefits is recognized in the interim period in which the change occurs. The computation of the annual expected effective income tax rate at each interim period requires certain estimates and assumptions including, but not limited to, the expected pre-tax income (or loss) for the year, projections of the proportion of income (and/or loss) earned and taxed in foreign jurisdictions, permanent and temporary differences, and the likelihood of the realization of deferred tax assets generated in the current year. The accounting estimates used to compute the provision or benefit for income taxes may change as new events occur, more experience is acquired, additional information is obtained or our tax environment changes. To the extent that the expected annual effective income tax rate changes during a quarter, the effect of the change on prior quarters is included in income tax provision in the quarter in which the change occurs. For the three and nine months ended September 30, 2018, the Company recorded an income tax benefit, despite pre-tax income, of $18.2 million and $15.9 million, due primarily to excess tax benefits generated by the exercise and vesting of stock-based awards, a reduction in the Transition Tax described below, and research credits. For the three and nine months ended September 30, 2017, the Company recorded an income tax benefit, despite pre-tax income, of $279.5 million and $322.8 million, respectively, due primarily to excess tax benefits generated by the exercise and vesting of stock-based awards. On December 22, 2017, the U.S. enacted the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act subjected to U.S. taxation certain previously deferred earnings of foreign subsidiaries as of December 31, 2017 (“Transition Tax”) and implemented a number of changes that took effect on January 1, 2018, including but not limited to, a reduction of the U.S. federal corporate tax rate from 35% to 21% and a new minimum tax on global intangible low-taxed income (“GILTI”) earned by foreign subsidiaries. The Company was able to make a reasonable estimate of the Transition Tax and recorded a provisional tax expense in the fourth quarter of 2017. In the third quarter of 2018, the Company finalized this calculation, which resulted in a $9.2 million reduction in the Transition Tax. The net reduction in the Transition Tax was due primarily to the utilization of additional foreign tax credits and a reduction in state taxes, partially offset by additional taxable earnings and profits of our foreign subsidiaries based on recently issued Internal Revenue Service ("IRS") guidance. The adjustment of the Company’s provisional tax expense was recorded as a change in estimate in accordance with Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act, which is also included in the FASB issued ASU No. 2018-05, Income Taxes (Topic 740), Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 (“SAB 118”), which was issued and adopted by the Company in March 2018. Despite the completion of the Company’s accounting for the Tax Act under SAB 118, many aspects of the law remain unclear and we expect ongoing guidance to be issued at both the federal and state levels. We will continue to monitor and assess the impact of any new developments. The Company recognizes interest and, if applicable, penalties related to unrecognized tax benefits in the income tax provision. Accruals for interest and penalties are not material. The Company is routinely under audit by federal, state, local and foreign authorities in the area of income tax. These audits include questioning the timing and the amount of income and deductions and the allocation of income and deductions among various tax jurisdictions. The IRS is currently auditing the Company’s federal income tax returns for the years ended December 31, 2010 through 2016. The statute of limitations for the years 2010 through 2012 has been extended to December 31, 2019, and the statute of limitations for the years 2013 and 2014 has been extended to March 31, 2019. Various other jurisdictions are open to examination for tax years beginning with 2009. Income taxes payable include unrecognized tax benefits considered sufficient to pay assessments that may result from examination of prior year tax returns. We consider many factors when evaluating and estimating our tax positions and tax benefits, which may not accurately anticipate actual outcomes and, therefore, may require periodic adjustments. Although management currently believes changes in unrecognized tax benefits from period to period and differences between amounts paid, if any, upon resolution of issues raised in audits and amounts previously provided will not have a material impact on the liquidity, results of operations, or financial condition of the Company, these matters are subject to inherent uncertainties and management’s view of these matters may change in the future. At September 30, 2018 and December 31, 2017, unrecognized tax benefits, including interest and penalties, are $43.7 million and $39.7 million, respectively. If unrecognized tax benefits at September 30, 2018 are subsequently recognized, $40.6 million, net of related deferred tax assets and interest, would reduce income tax expense. The comparable amount as of December 31, 2017 was $37.2 million. The Company believes that it is reasonably possible that its unrecognized tax benefits could decrease by $14.6 million by September 30, 2019, due to expirations of statutes of limitations; $14.3 million of which would reduce the income tax provision. The Company regularly assesses the realizability of deferred tax assets considering all available evidence including, among other things, the nature, frequency and severity of prior cumulative losses, forecasts of future taxable income, the duration of statutory carryforward periods, available tax planning and historical experience, to the extent these items are applicable. As of September 30, 2018, the Company has a gross deferred tax asset of $149.0 million that the Company expects to fully utilize on a more likely than not basis.

BUSINESS COMBINATION

9 Months Ended

Sep. 30, 2018

Business Combinations [Abstract]

BUSINESS COMBINATION

On September 29, 2017, the Company completed the combination of the businesses in the Company's HomeAdvisor segment and Angie's List under a new publicly traded company called ANGI Homeservices (the "Combination"). Through the Combination, ANGI acquired 100% of the common stock of Angie's List on September 29, 2017 for a total purchase price valued at $781.4 million.

The unaudited pro forma financial information in the table below presents the combined results of the Company and Angie's List as if the Combination had occurred on January 1, 2016. The unaudited pro forma financial information includes adjustments required under the acquisition method of accounting and is presented for informational purposes only and is not necessarily indicative of the results that would have been achieved had the Combination actually occurred on January 1, 2016. For the three and nine months ended September 30, 2017, pro forma adjustments include (i) reductions in stock-based compensation expense of $85.1 million and $52.8 million, respectively, and transaction related costs of $22.1 million and $25.6 million, respectively, because they are one-time in nature and will not have a continuing impact on operations; and (ii) an increase in amortization of intangibles of $11.4 million and $34.4 million, respectively. The stock-based compensation expense is related to the modification of previously issued HomeAdvisor equity awards and previously issued Angie's List equity awards, both of which were converted into ANGI Homeservices' equity awards in the Combination, and the acceleration of certain converted equity awards resulting from the termination of Angie's List employees in connection with the Combination. The transaction related costs include severance and retention costs of $12.0 million related to the Combination.



	Three Months Ended September 30, 2017		Nine Months Ended September 30, 2017
	(In thousands, except per share data)
Revenue	$	898,584	$	2,571,613
Net earnings attributable to IAC shareholders	$	244,400	$	313,054
Basic earnings per share attributable to IAC shareholders	$	3.02	$	3.94
Diluted earnings per share attributable to IAC shareholders	$	2.80	$	3.70

FINANCIAL INSTRUMENTS

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

FINANCIAL INSTRUMENTS

Marketable Securities

At September 30, 2018 and December 31, 2017, the fair value of marketable securities are as follows:



	September 30, 2018		December 31, 2017
	(In thousands)
Available-for-sale marketable debt securities	$	208,005	$	4,995
Marketable equity security	550		—
Total marketable securities	$	208,555	$	4,995

At September 30, 2018, current available-for-sale marketable debt securities are as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Treasury discount notes	$	171,974	$	—	$	(10	)	$	171,964
Commercial paper	36,041		—		—			36,041
Total available-for-sale marketable debt securities	$	208,015	$	—	$	(10	)	$	208,005

The contractual maturities of debt securities classified as current available-for-sale at September 30, 2018 are within one year. There are no investments in available-for-sale marketable debt securities that have been in a continuous unrealized loss position for longer than twelve months as of September 30, 2018.

At December 31, 2017, current available-for-sale marketable debt securities are as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
Commercial paper	$	4,995	$	—	$	—	$	4,995
Total available-for-sale marketable debt securities	$	4,995	$	—	$	—	$	4,995

The following table presents the proceeds from maturities and sales of available-for-sale marketable debt securities:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
	(In thousands)
Proceeds from maturities and sales of available-for-sale marketable debt securities	$	115,000	$	15,000	$	125,000	$	114,350

The specific-identification method is used to determine the cost of available-for-sale marketable debt securities sold and the amount of unrealized gains and losses reclassified out of accumulated other comprehensive income (loss) into earnings. There were no gross realized gains or losses from the maturities and sales of available-for-sale marketable debt securities for the three and nine months ended September 30, 2018 and 2017.

Equity securities without readily determinable fair values

At September 30, 2018 and December 31, 2017, the carrying values of the Company's investments in equity securities without readily determinable fair values totaled $216.4 million and $63.4 million, respectively, and are included in "Long-term investments" in the accompanying consolidated balance sheet. Following the adoption of the measurement alternative under ASU No. 2016-01 on January 1, 2018, the Company's equity securities without readily determinable fair values are carried at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. All gains and losses on equity securities without readily determinable fair values, realized and unrealized, are recognized in "other income (expense), net" in the accompanying consolidated statement of operations.

The following table presents a summary of realized and unrealized gains and losses recorded in other income (expense), net, as adjustments to the carrying value of equity securities without readily determinable fair values held as of September 30, 2018. The gross unrealized gains relate to the Company's remaining investments in an investee following the sale of a portion of the Company's investment during the second quarter of 2018.



	Three Months Ended September 30, 2018		Nine Months Ended September 30, 2018
	(In thousands)
Upward adjustments (gross unrealized gains)	$	—	$	128,786
Downward adjustments (including impairment) (gross unrealized losses)	—		(2,588		)
Total	$	—	$	126,198

Realized and unrealized gains and losses for the Company's marketable equity security and investments without a readily determinable fair value for the three and nine months ended September 30, 2018 are as follows:



	Three Months Ended September 30, 2018			Nine Months Ended September 30, 2018
	(In thousands)
Realized gains, net, for equity securities sold	$	702		$	27,874
Unrealized (losses) gains, net, on equity securities held	(115		)	126,444
Total gains recognized, net, in other income, net	$	587		$	154,318

Fair Value Measurements

The Company categorizes its financial instruments measured at fair value into a fair value hierarchy that prioritizes the inputs used in pricing the asset or liability. The three levels of the fair value hierarchy are:


•	Level 1: Observable inputs obtained from independent sources, such as quoted market prices for identical assets and liabilities in active markets.

•

Level 2: Other inputs, which are observable directly or indirectly, such as quoted market prices for similar assets or liabilities in active markets, quoted market prices for identical or similar assets or liabilities in markets that are not active and inputs that are derived principally from or corroborated by observable market data. The fair values of the Company's Level 2 financial assets are primarily obtained from observable market prices for identical underlying securities that may not be actively traded. Certain of these securities may have different market prices from multiple market data sources, in which case an average market price is used.


•	Level 3: Unobservable inputs for which there is little or no market data and require the Company to develop its own assumptions, based on the best information available in the circumstances, about the assumptions market participants would use in pricing the assets or liabilities. See below for a discussion of fair value measurements made using Level 3 inputs.

The following tables present the Company's financial instruments that are measured at fair value on a recurring basis:



	September 30, 2018
	Quoted Market Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value Measurements
	(In thousands)
Assets:
Cash equivalents:
Money market funds	$	745,046	$	—	$	—		$	745,046
Treasury discount notes	—		194,843		—			194,843
Commercial paper	—		157,808		—			157,808
Time deposits	—		105,034		—			105,034
Marketable securities:
Treasury discount notes	—		171,964		—			171,964
Commercial paper	—		36,041		—			36,041
Marketable equity security	550		—		—			550
Total	$	745,596	$	665,690	$	—		$	1,411,286

Liabilities:
Contingent consideration arrangements	$	—	$	—	$	(1,980	)	$	(1,980	)



	December 31, 2017
	Quoted Market Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value Measurements
	(In thousands)
Assets:
Cash equivalents:
Money market funds	$	780,425	$	—	$	—		$	780,425
Treasury discount notes	—		100,457		—			100,457
Commercial paper	—		215,325		—			215,325
Time deposits	—		60,000		—			60,000
Certificates of deposit	—		6,195		—			6,195
Marketable securities:
Commercial paper	—		4,995		—			4,995
Total	$	780,425	$	386,972	$	—		$	1,167,397

Liabilities:
Contingent consideration arrangements	$	—	$	—	$	(2,647	)	$	(2,647	)

The Company's financial instruments that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3) are its contingent consideration arrangements.



	Contingent Consideration Arrangements
	Three Months Ended September 30,
	2018			2017
	(In thousands)
Balance at July 1	$	(1,910	)	$	(24,829	)
Total net losses:
Included in earnings:
Fair value adjustments	(55		)	(60		)
Included in other comprehensive loss	(15		)	(332		)
Settlements	—			23,429
Balance at September 30	$	(1,980	)	$	(1,792	)



	Contingent Consideration Arrangements
	Nine Months Ended September 30,
	2018			2017
	(In thousands)
Balance at January 1	$	(2,647	)	$	(33,871	)
Total net losses:
Included in earnings:
Fair value adjustments	(265		)	(4,945		)
Included in other comprehensive loss	(16		)	(1,405		)
Settlements	948			38,429
Balance at September 30	$	(1,980	)	$	(1,792	)

Contingent Consideration Arrangements

As of September 30, 2018, there are three contingent consideration arrangements related to business acquisitions. Two of the contingent consideration arrangements have limits as to the maximum amount that can be paid. The maximum contingent payments related to these arrangements is $32.0 million and the gross fair value of these arrangements, before the unamortized discount, at September 30, 2018 is $2.0 million. No payment is expected for the one contingent consideration arrangement which does not have a limit on the maximum earnout.

The contingent consideration arrangements are based upon earnings performance and/or operating metrics. The Company generally determines the fair value of the contingent consideration arrangements by using probability-weighted analyses to determine the amounts of the gross liability, and, because the arrangements were initially long-term in nature, applying a discount rate that appropriately captures the risks associated with the obligation to determine the net amount reflected in the consolidated financial statements. The fair values of the contingent consideration arrangements at both September 30, 2018 and December 31, 2017 reflect discount rates of 12%.

The fair value of contingent consideration arrangements is sensitive to changes in the forecasts of earnings and/or the relevant operating metrics and changes in discount rates. The Company remeasures the fair value of the contingent consideration arrangements each reporting period, including the accretion of the discount, if applicable, and changes are recognized in “General and administrative expense” in the accompanying consolidated statement of operations. The contingent consideration arrangement liability at September 30, 2018 and December 31, 2017 includes a current portion of $2.0 million and $0.6 million, respectively, and non-current portion of $2.0 million at December 31, 2017, which are included in “Accrued expenses and other current liabilities” and “Other long-term liabilities,” respectively, in the accompanying consolidated balance sheet. At September 30, 2018, there is no non-current portion of the contingent consideration arrangement liability.

Assets measured at fair value on a nonrecurring basis

The Company's non-financial assets, such as goodwill, intangible assets and property and equipment, as well as equity method investments, are adjusted to fair value only when an impairment charge is recognized. The Company's financial assets, comprising equity securities without readily determinable fair values, are adjusted to fair value when observable price changes are identified or an impairment charge is recognized. Such fair value measurements are based predominantly on Level 3 inputs.

Financial instruments measured at fair value only for disclosure purposes

The following table presents the carrying value and the fair value of financial instruments measured at fair value only for disclosure purposes:



	September 30, 2018						December 31, 2017
	Carrying Value			Fair Value			Carrying Value			Fair Value
	(In thousands)
Current portion of long-term debt	$	(13,750	)	$	(13,664	)	$	(13,750	)	$	(13,802	)
Long-term debt, net^(a)	(1,983,993		)	(2,353,160		)	(1,979,469		)	(2,168,108		)

_________________


^(a)	At September 30, 2018 and December 31, 2017, the carrying value of long-term debt, net includes unamortized original issue discount and debt issuance costs of $93.9 million and $109.1 million, respectively.

The fair value of long-term debt, including the current portion, is estimated using observable market prices or indices for similar liabilities, which are Level 2 inputs.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

LONG-TERM DEBT

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

LONG-TERM DEBT

Long-term debt consists of:



	September 30, 2018		December 31, 2017
	(In thousands)
MTCH Debt:
MTCH Term Loan due November 16, 2022	$	425,000	$	425,000
6.375% Senior Notes due June 1, 2024 (the "6.375% MTCH Senior Notes"); interest payable each June 1 and December 1	400,000		400,000
5.00% Senior Notes due December 15, 2027 (the "5.00% MTCH Senior Notes"); interest payable each June 15 and December 15	450,000		450,000
Total MTCH long-term debt	1,275,000		1,275,000
Less: unamortized original issue discount	7,681		8,668
Less: unamortized debt issuance costs	12,231		13,636
Total MTCH debt, net	1,255,088		1,252,696

ANGI Debt:
ANGI Term Loan due November 1, 2022	264,688		275,000
Less: current portion of ANGI Term Loan	13,750		13,750
Less: unamortized debt issuance costs	2,483		2,938
Total ANGI debt, net	248,455		258,312

IAC Debt:
0.875% Exchangeable Senior Notes due October 1, 2022 (the "Exchangeable Notes"); interest payable each April 1 and October 1	517,500		517,500
4.75% Senior Notes due December 15, 2022 (the "4.75% Senior Notes"); interest payable each June 15 and December 15	34,489		34,859
Total IAC long-term debt	551,989		552,359
Less: unamortized original issue discount	57,356		67,158
Less: unamortized debt issuance costs	14,183		16,740
Total IAC debt, net	480,450		468,461

Total long-term debt, net	$	1,983,993	$	1,979,469

MTCH Senior Notes

The 6.375% MTCH Senior Notes were issued on June 1, 2016. The proceeds of $400 million were used to prepay a portion of indebtedness outstanding under the MTCH Term Loan. At any time prior to June 1, 2019, these notes may be redeemed at a redemption price equal to the sum of the principal amount thereof, plus accrued and unpaid interest and a make-whole premium set forth in the indenture governing the notes. Thereafter, these notes may be redeemed at redemption prices set forth in the indenture governing the notes, together with accrued and unpaid interest thereon to the applicable redemption date.

On December 4, 2017, MTCH issued $450 million aggregate principal amount of its 5.00% Senior Notes. The proceeds from these notes, along with cash on hand, were used to redeem the $445.2 million outstanding balance of the 6.75% MTCH Senior Notes, which were due on December 15, 2022, and pay the related call premium. At any time prior to December 15, 2022, the 5.00% MTCH Senior Notes may be redeemed at a redemption price equal to the sum of the principal amount thereof, plus accrued and unpaid interest and a make-whole premium set forth in the indenture governing the notes. Thereafter, these notes may be redeemed at redemption prices set forth in the indenture governing the notes, together with accrued and unpaid interest thereon to the applicable redemption date.

The indentures governing the 6.375% and 5.00% MTCH Senior Notes (i) contain covenants that would limit MTCH's ability to pay dividends or to make distributions and repurchase or redeem MTCH stock in the event a default has occurred or MTCH's leverage ratio (as defined in the indentures) exceeds 5.0 to 1.0 and (ii) are ranked equally with each other. At September 30, 2018, there were no limitations pursuant thereto. There are additional covenants that limit MTCH's ability and the ability of its subsidiaries to, among other things, (i) incur indebtedness, make investments, or sell assets in the event MTCH is not in compliance with certain ratios set forth in the indentures, and (ii) incur liens, enter into agreements restricting MTCH subsidiaries' ability to pay dividends, enter into transactions with affiliates and consolidate, merge or sell substantially all of their assets.

MTCH Term Loan and MTCH Credit Facility

At both September 30, 2018 and December 31, 2017, the outstanding balance on the MTCH Term Loan was $425 million. The MTCH Term Loan bears interest at LIBOR plus 2.50% and was 4.67% and 3.85% at September 30, 2018 and December 31, 2017, respectively. The MTCH Term Loan provides for annual principal payments as part of an excess cash flow sweep provision, the amount of which, if any, is governed by the secured net leverage ratio contained in the credit agreement. Interest payments are due at least quarterly through the term of the loan.

As of September 30, 2018, MTCH has a $500 million revolving credit facility (the "MTCH Credit Facility") that expires on October 7, 2020. At September 30, 2018 and December 31, 2017, there were no outstanding borrowings under the MTCH Credit Facility. The annual commitment fee on undrawn funds based on the current leverage ratio is 25 basis points. Borrowings under the MTCH Credit Facility bear interest, at MTCH's option, at a base rate or LIBOR, in each case plus an applicable margin, which is determined by reference to a pricing grid based on MTCH's consolidated net leverage ratio. The terms of the MTCH Credit Facility require MTCH to maintain a consolidated net leverage ratio of not more than 5.0 to 1.0 and a minimum interest coverage ratio of not less than 2.5 to 1.0 (in each case as defined in the agreement).

There are additional covenants under the MTCH Credit Facility and the MTCH Term Loan that limit the ability of MTCH and its subsidiaries to, among other things, incur indebtedness, pay dividends or make distributions. While the MTCH Term Loan remains outstanding, these same covenants under its credit agreement are generally more restrictive than the covenants that are applicable to the MTCH Credit Facility. Obligations under the MTCH Credit Facility and MTCH Term Loan are unconditionally guaranteed by certain MTCH wholly-owned domestic subsidiaries, and are also secured by the stock of certain MTCH domestic and foreign subsidiaries. The MTCH Term Loan and outstanding borrowings, if any, under the MTCH Credit Facility rank equally with each other, and have priority over the 6.375% and 5.00% MTCH Senior Notes to the extent of the value of the assets securing the borrowings under the MTCH credit agreement.

ANGI Term Loan:

At September 30, 2018 and December 31, 2017, the outstanding balance on the ANGI Term Loan was $264.7 million and $275.0 million, respectively. The ANGI Term Loan bears interest at LIBOR plus 1.75%, or 4.10% at September 30, 2018, which is subject to change in future periods based on ANGI's consolidated net leverage ratio. The ANGI Term Loan bore interest at LIBOR plus 2.00%, or 3.38%, at December 31, 2017. Interest payments are due at least quarterly through the term of the loan and quarterly principal payments of 1.25% of the original principal amount in the first three years, 2.5% in the fourth year and 3.75% in the fifth year are required.

The terms of the ANGI Term Loan require ANGI to maintain a consolidated net leverage ratio of not more than 4.5 to 1.0 and a minimum interest coverage ratio of not less than 2.5 to 1.0 (in each case as defined in the credit agreement). There are additional covenants under the ANGI Term Loan that limit the ability of ANGI and its subsidiaries to, among other things, incur indebtedness, pay dividends or make distributions. The ANGI Term Loan is guaranteed by ANGI's wholly-owned material domestic subsidiaries and is secured by substantially all assets of ANGI and the guarantors, subject to certain exceptions.

IAC Exchangeable Notes:

On October 2, 2017, IAC FinanceCo, Inc., a direct, wholly-owned subsidiary of the Company, issued $517.5 million aggregate principal amount of its 0.875% Exchangeable Senior Notes (the “Exchangeable Notes”). The Exchangeable Notes are guaranteed by the Company. Each $1,000 of principal of the Exchangeable Notes is exchangeable for 6.5713 shares of the Company's common stock, which is equivalent to an exchange price of approximately $152.18 per share, subject to adjustment upon the occurrence of specified events. Upon exchange, the Company has the right to settle the principal amount of Exchangeable Notes with any of the three following alternatives: (1) shares of our common stock, (2) cash or (3) a combination of cash and shares of our common stock.

The Exchangeable Notes are exchangeable at any time prior to the close of business on the business day immediately preceding July 1, 2022 only under the following circumstances: (1) during any calendar quarter (and only during such calendar quarter), if the last reported sale price of our common stock for at least 20 trading days during the period of 30 consecutive trading days during the immediately preceding calendar quarter is greater than or equal to 130% of the exchange price on each applicable trading day, which occurred in the third quarter of 2018; (2) during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our common stock and the exchange rate on each such trading day; (3) if the issuer calls the notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or (4) upon the occurrence of specified corporate events as further described under the indenture governing the Exchangeable Notes. On or after July 1, 2022 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may exchange all or any portion of their Exchangeable Notes regardless of the foregoing conditions.

A portion of the net proceeds from the sale of the Exchangeable Notes of $499.5 million, after deducting fees and expenses, was used to pay the net premium of $50.7 million on the Exchangeable Note Hedge and Warrants (defined below).

We separately account for the debt and the equity components of the Exchangeable Notes. Accordingly, the Company recorded a debt discount and corresponding increase to additional paid-in capital of $70.4 million, which is the fair value attributed to the exchange feature or equity component of the debt, on the date of issuance. The Company is amortizing the debt discount utilizing the effective interest method over the life of the Exchangeable Notes which increases the effective interest rate from its coupon rate of 0.875% to 3.88%.

In connection with the debt offering, the Company purchased call options allowing the Company to purchase initially (subject to adjustment upon the occurrence of specified events) the entire 3.4 million shares that would be issuable upon the exchange of the Exchangeable Notes at approximately $152.18 per share (the "Exchangeable Note Hedge"), and sold warrants allowing the holder to purchase initially (subject to adjustment upon the occurrence of specified events) 3.4 million shares at $229.70 per share (the "Warrants"). The if-converted value of the Exchangeable Notes exceeds its principal amount by $219.5 million based on the Company's stock price on September 30, 2018. The Exchangeable Note Hedge is expected to reduce the potential dilutive effect on the Company's common stock upon any exchange of notes and/or offset any cash payment IAC FinanceCo, Inc. is required to make in excess of the principal amount of the exchanged notes. The Warrants have a dilutive effect on the Company's common stock to the extent that the market price per share of the Company common stock exceeds the strike price of the Warrants.

For the three and nine months ended September 30, 2018, the Company incurred interest expense of $5.3 million and $15.8 million, which includes amortization of original issue discount of $3.3 million and $9.8 million, and debt issuance costs of $0.9 million and $2.6 million, respectively. As of September 30, 2018, the unamortized discount is $57.4 million resulting in a net carrying value of the liability component of $460.1 million.

IAC Senior Notes

The 4.75% Senior Notes were issued by IAC on December 21, 2012. These Notes are unconditionally guaranteed by certain of our wholly-owned domestic subsidiaries, which are designated as guarantor subsidiaries. See "Note 12—Guarantor and Non-Guarantor Financial Information" for financial information relating to guarantor and non-guarantor subsidiaries. The 4.75% Senior Notes may be redeemed at redemption prices set forth in the indenture governing the notes, together with accrued and unpaid interest thereon to the applicable redemption date.

IAC Credit Facility

As of September 30, 2018, IAC has a $300 million revolving credit facility (the "IAC Credit Facility") that expires October 7, 2020. At September 30, 2018 and December 31, 2017, there were no outstanding borrowings under the IAC Credit Facility. The annual commitment fee on undrawn funds is 25 basis points, and is based on the leverage ratio (as defined in the agreement) most recently reported. Borrowings under the IAC Credit Facility bear interest, at the Company's option, at a base rate or LIBOR, in each case, plus an applicable margin, which is determined by reference to a pricing grid based on the Company's leverage ratio. The terms of the IAC Credit Facility require that the Company maintains a leverage ratio of not more than 3.25 to 1.0 and restrict our ability to incur additional indebtedness. Borrowings under the IAC Credit Facility are unconditionally guaranteed by substantially the same domestic subsidiaries that guarantee the 4.75% Senior Notes and are also secured by the stock of certain of our domestic and foreign subsidiaries, which includes MTCH and ANGI. The 4.75% Senior Notes are subordinate to the outstanding borrowings under the IAC Credit Facility to the extent of the value of the assets securing such borrowings.

ACCUMULATED OTHER COMPREHENSIVE LOSS

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

ACCUMULATED OTHER COMPREHENSIVE LOSS

The following tables present the components of accumulated other comprehensive (loss) income and items reclassified out of accumulated other comprehensive loss into earnings:



	Three Months Ended September 30, 2018
	Foreign Currency Translation Adjustment			Unrealized Gains (Losses) On Available-For-Sale Securities			Accumulated Other Comprehensive Loss
	(In thousands)
Balance as of July 1	$	(112,730	)	$	13		$	(112,717	)
Other comprehensive loss	(111		)	(27		)	(138		)
Balance as of September 30	$	(112,841	)	$	(14	)	$	(112,855	)



	Three Months Ended September 30, 2017
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Securities		Accumulated Other Comprehensive (Loss) Income
	(In thousands)
Balance as of July 1	$	(136,738	)	$	—	$	(136,738	)
Other comprehensive income	37,225			—		37,225
Balance as of September 30	$	(99,513	)	$	—	$	(99,513	)



	Nine Months Ended September 30, 2018
	Foreign Currency Translation Adjustment			Unrealized Losses On Available-For-Sale Securities			Accumulated Other Comprehensive Loss
	(In thousands)
Balance as of January 1	$	(103,568	)	$	—		$	(103,568	)
Other comprehensive loss before reclassifications	(9,221		)	(14		)	(9,235		)
Amounts reclassified to earnings	(52		)	—			(52		)
Net current period other comprehensive loss	(9,273		)	(14		)	(9,287		)
Balance as of September 30	$	(112,841	)	$	(14	)	$	(112,855	)



	Nine Months Ended September 30, 2017
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Securities			Accumulated Other Comprehensive (Loss) Income
	(In thousands)
Balance as of January 1	$	(170,149	)	$	4,026		$	(166,123	)
Other comprehensive income before reclassifications	69,951			7			69,958
Amounts reclassified to earnings	685			(4,033		)	(3,348		)
Net current period other comprehensive income (loss)	70,636			(4,026		)	66,610
Balance as of September 30	$	(99,513	)	$	—		$	(99,513	)

The amounts reclassified out of foreign currency translation adjustment into earnings for both the nine months ended September 30, 2018 and 2017 relate to the liquidation of international subsidiaries. The amount reclassified out of unrealized gains on available-for-sale securities into earnings for the nine months ended September 30, 2017 includes a tax benefit of $3.8 million.

EARNINGS PER SHARE

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

EARNINGS PER SHARE

The following tables set forth the computation of basic and diluted earnings per share attributable to IAC shareholders:



	Three Months Ended September 30,
	2018						2017
	Basic			Diluted			Basic			Diluted
	(In thousands, except per share data)
Numerator:
Net earnings	$	171,577		$	171,577		$	225,639		$	225,639
Net earnings attributable to noncontrolling interests	(25,803		)	(25,803		)	(45,996		)	(45,996		)
Impact from public subsidiaries' dilutive securities ^(a)	—			(8,336		)	—			(23,749		)
Net earnings attributable to IAC shareholders	$	145,774		$	137,438		$	179,643		$	155,894

Denominator:
Weighted average basic shares outstanding	83,433			83,433			80,817			80,817
Dilutive securities ^{(a) (b) (c) (d)}	—			8,542			—			6,379
Denominator for earnings per share—weighted average shares^{(a) (b) (c) (d)}	83,433			91,975			80,817			87,196

Earnings per share attributable to IAC shareholders:
Earnings per share	$	1.75		$	1.49		$	2.22		$	1.79



	Nine Months Ended September 30,
	2018						2017
	Basic			Diluted			Basic			Diluted
	(In thousands, except per share data)
Numerator:
Net earnings	$	540,270		$	540,270		$	334,659		$	334,659
Net earnings attributable to noncontrolling interests	(105,061		)	(105,061		)	(62,539		)	(62,539		)
Impact from public subsidiaries' dilutive securities ^(a)	—			(19,490		)	—			(34,104		)
Net earnings attributable to IAC shareholders	$	435,209		$	415,719		$	272,120		$	238,016

Denominator:
Weighted average basic shares outstanding	83,342			83,342			79,369			79,369
Dilutive securities ^{(a) (b) (c) (d)}	—			8,076			—			5,133
Denominator for earnings per share—weighted average shares^{(a) (b) (c) (d)}	83,342			91,418			79,369			84,502

Earnings per share attributable to IAC shareholders:
Earnings per share	$	5.22		$	4.55		$	3.43		$	2.82

________________________

^(a)

For the three months ended September 30, 2018, it is more dilutive for IAC to settle certain ANGI equity awards and MTCH to settle certain MTCH equity awards. For the nine months ended September 30, 2018, it is more dilutive for IAC to settle certain MTCH and ANGI equity awards. For the three and nine months ended September 30, 2017, it is more dilutive for IAC to settle certain ANGI equity awards and MTCH to settle certain MTCH equity awards.

^(b)

If the effect is dilutive, weighted average common shares outstanding include the incremental shares that would be issued upon the assumed exercise of stock options, warrants and subsidiary denominated equity, exchange of the Company's Exchangeable Notes and vesting of restricted stock units ("RSUs"). For both the three and nine months ended September 30, 2018, 3.4 million potentially dilutive securities are excluded from the calculation of diluted earnings per share because their inclusion would have been anti-dilutive. For the three months ended September 30, 2017, there were no potentially dilutive securities excluded from the calculation of diluted earnings per share. For the nine months ended September 30, 2017 less than 0.1 million potentially dilutive securities are excluded from the calculation of diluted earnings per share because their inclusion would have been anti-dilutive.

^(c)

Market-based awards and performance-based stock units (“PSUs”) are considered contingently issuable shares. Shares issuable upon exercise or vesting of market-based awards and PSUs are included in the denominator for earnings per share if (i) the applicable market or performance condition(s) has been met and (ii) the inclusion of the market-based awards and PSUs is dilutive for the respective reporting periods. For both the three and nine months ended September 30, 2018 and 2017, 0.2 million and 0.3 million shares, respectively, underlying market-based awards and PSUs were excluded from the calculation of diluted earnings per share because the market or performance conditions had not been met.

^(d)

It is the Company's intention to settle the Exchangeable Notes through a combination of cash, equal to the face amount of the notes, and shares; therefore, the Exchangeable Notes are only dilutive for periods during which the average price of IAC common stock exceeds the approximate $152.18 per share exchange price per $1,000 principal amount of the Exchangeable Notes. For the three and nine months ended September 30, 2018, the average price of IAC common stock exceeded $152.18 and the dilutive impact of the Exchangeable Notes was 0.6 million and 0.2 million shares, respectively.

SEGMENT INFORMATION

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

SEGMENT INFORMATION

The overall concept that IAC employs in determining its operating segments is to present the financial information in a manner consistent with: how the chief operating decision maker views the businesses; how the businesses are organized as to segment management; and the focus of the businesses with regards to the types of services or products offered or the target market. Operating segments are combined for reporting purposes if they meet certain aggregation criteria, which principally relate to the similarity of their economic characteristics.

The following table presents revenue by reportable segment:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
	(In thousands)
Revenue:
Match Group	$	443,943		$	343,418		$	1,272,506		$	951,754
ANGI Homeservices	303,116			181,717			853,249			513,173
Video	64,193			78,338			193,112			184,097
Applications	153,973			136,333			429,034			439,199
Publishing	139,439			88,755			411,116			244,959
Other^(a)	—			—			—			23,980
Inter-segment eliminations	(72		)	(127		)	(228		)	(508		)
Total	$	1,104,592		$	828,434		$	3,158,789		$	2,356,654

___________________


^(a)	The 2017 results at the Other segment consists of the results of The Princeton Review prior to its sale on March 31, 2017.

The following table presents the revenue of the Company's reportable segments disaggregated by type of service:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
	(In thousands)
Match Group
Direct revenue:
North America	$	233,643	$	186,868	$	667,163	$	540,701
International	197,902		143,230		564,846		376,572
Direct revenue	431,545		330,098		1,232,009		917,273
Indirect revenue (principally advertising revenue)	12,398		13,320		40,497		34,481
Total Match Group revenue	$	443,943	$	343,418	$	1,272,506	$	951,754

ANGI Homeservices
Marketplace:
Consumer connection revenue	$	195,065	$	141,055	$	531,297	$	398,218
Membership subscription revenue	17,034		14,486		49,226		40,942
Other revenue	950		1,060		2,869		2,840
Marketplace revenue	213,049		156,601		583,392		442,000
Advertising & Other revenue	73,545		10,503		216,733		28,667
North America	286,594		167,104		800,125		470,667
Consumer connection revenue	12,022		10,001		38,885		29,636
Membership subscription revenue	4,217		4,320		13,405		12,198
Other revenue	283		292		834		672
Europe	16,522		14,613		53,124		42,506
Total ANGI Homeservices revenue	$	303,116	$	181,717	$	853,249	$	513,173

Video
Subscription revenue	$	33,964	$	28,348	$	101,031	$	79,947
Media production and distribution revenue	15,966		45,926		52,281		90,603



Advertising and other revenue	14,263		4,064		39,800		13,547
Total Video revenue	$	64,193	$	78,338	$	193,112	$	184,097

Applications
Desktop
Advertising revenue:
Google advertising revenue	$	110,855	$	112,356	$	326,982	$	364,622
Other	3,410		1,574		7,223		4,795
Advertising revenue	114,265		113,930		334,205		369,417
Subscription and other revenue	4,277		8,692		16,355		25,889
Total Desktop	118,542		122,622		350,560		395,306
Mobile
Subscription and other revenue	31,157		6,216		63,687		23,150
Advertising revenue	4,274		7,495		14,787		20,743
Total Mobile	35,431		13,711		78,474		43,893
Total Applications revenue	$	153,973	$	136,333	$	429,034	$	439,199

Publishing
Premium Brands
Advertising revenue:
Google advertising revenue	$	11,526	$	11,956	$	37,517	$	32,553
Other	26,231		17,909		76,401		51,009
Advertising revenue	37,757		29,865		113,918		83,562
Other revenue	1,340		756		3,746		1,405
Total Premium Brands	39,097		30,621		117,664		84,967
Ask & Other
Advertising revenue:
Google advertising revenue	81,507		51,995		254,762		140,476
Other	12,407		5,928		28,682		18,919
Advertising revenue	93,914		57,923		283,444		159,395
Other revenue	6,428		211		10,008		597
Total Ask & Other	100,342		58,134		293,452		159,992
Total Publishing revenue	$	139,439	$	88,755	$	411,116	$	244,959

Revenue by geography is based on where the customer is located. Geographic information about revenue and long-lived assets is presented below:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
	(In thousands)
Revenue:
United States	$	738,599	$	577,362	$	2,104,750	$	1,670,980
All other countries	365,993		251,072		1,054,039		685,674
Total	$	1,104,592	$	828,434	$	3,158,789	$	2,356,654



	September 30, 2018		December 31, 2017
	(In thousands)
Long-lived assets (excluding goodwill and intangible assets):
United States	$	279,690	$	286,541
All other countries	28,775		28,629
Total	$	308,465	$	315,170

The following tables present operating income (loss) and Adjusted EBTIDA by reportable segment:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
	(In thousands)
Operating Income (Loss):
Match Group	$	139,895		$	91,008		$	402,293		$	232,854
ANGI Homeservices	33,515			(112,505		)	46,021			(115,258		)
Video	(10,250		)	(1,809		)	(41,107		)	(25,227		)
Applications	33,041			29,386			91,579			101,288
Publishing	17,398			5,677			46,016			(2,968		)
Other^(a)	—			—			—			(5,621		)
Corporate	(40,767		)	(30,346		)	(113,583		)	(90,962		)
Total	$	172,832		$	(18,589	)	$	431,219		$	94,106



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
	(In thousands)
Adjusted EBITDA:^(b)
Match Group	$	165,039		$	119,564		$	478,341		$	315,705
ANGI Homeservices	$	77,700		$	(2,266	)	$	181,319		$	21,612
Video	$	(7,390	)	$	(822	)	$	(31,432	)	$	(22,386	)
Applications	$	34,989		$	31,077		$	97,145		$	106,556
Publishing	$	18,467		$	7,088		$	49,435		$	11,007
Other^(a)	$	—		$	—		$	—		$	(1,532	)
Corporate	$	(21,478	)	$	(17,070	)	$	(54,038	)	$	(46,908	)

________________________

^(b)

The Company's primary financial measure is Adjusted EBITDA, which is defined as operating income excluding: (1) stock-based compensation expense; (2) depreciation; and (3) acquisition-related items consisting of (i) amortization of intangible assets and impairments of goodwill and intangible assets, if applicable, and (ii) gains and losses recognized on changes in the fair value of contingent consideration arrangements. The Company believes this measure is useful for analysts and investors as this measure allows a more meaningful comparison between our performance and that of our competitors. Moreover, our management uses this measure internally to evaluate the performance of our businesses, and this measure is one of the primary metrics on which our internal budgets are based and by which management is compensated. The above items are excluded from our Adjusted EBITDA measure because these items are non-cash in nature. Adjusted EBITDA has certain limitations in that it does not take into account the impact to IAC's statement of operations of certain expenses.

The following tables reconcile operating income (loss) for the Company's reportable segments and net earnings attributable to IAC shareholders to Adjusted EBITDA:



	Three Months Ended September 30, 2018
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	139,895		$	16,141	$	8,513	$	435	$	55	$	165,039
ANGI Homeservices	33,515			$	22,474	$	6,100	$	15,611	$	—	$	77,700
Video	(10,250		)	$	323	$	396	$	2,141	$	—	$	(7,390	)
Applications	33,041			$	—	$	617	$	1,331	$	—	$	34,989
Publishing	17,398			$	—	$	435	$	634	$	—	$	18,467
Corporate	(40,767		)	$	16,425	$	2,864	$	—	$	—	$	(21,478	)
Operating income	172,832
Interest expense	(27,610		)
Other income, net	8,113
Earnings before income taxes	153,335
Income tax benefit	18,242
Net earnings	171,577
Net earnings attributable to noncontrolling interests	(25,803		)
Net earnings attributable to IAC shareholders	$	145,774



	Three Months Ended September 30, 2017
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	91,008		$	19,949	$	8,147	$	401	$	59	$	119,564
ANGI Homeservices	(112,505		)	$	103,980	$	3,491	$	2,768	$	—	$	(2,266	)
Video	(1,809		)	$	134	$	541	$	312	$	—	$	(822	)
Applications	29,386			$	—	$	1,155	$	536	$	—	$	31,077
Publishing	5,677			$	—	$	1,062	$	349	$	—	$	7,088
Corporate	(30,346		)	$	10,409	$	2,867	$	—	$	—	$	(17,070	)
Operating loss	(18,589		)
Interest expense	(25,036		)
Other expense, net	(10,216		)
Loss before income taxes	(53,841		)
Income tax benefit	279,480
Net earnings	225,639
Net earnings attributable to noncontrolling interests	(45,996		)
Net earnings attributable to IAC shareholders	$	179,643



	Nine Months Ended September 30, 2018
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	402,293		$	49,810	$	25,059	$	914	$	265	$	478,341
ANGI Homeservices	46,021			$	69,433	$	18,170	$	47,695	$	—	$	181,319
Video	(41,107		)	$	1,747	$	1,518	$	6,410	$	—	$	(31,432	)
Applications	91,579			$	—	$	2,145	$	3,421	$	—	$	97,145
Publishing	46,016			$	—	$	1,566	$	1,853	$	—	$	49,435
Corporate	(113,583		)	$	51,016	$	8,529	$	—	$	—	$	(54,038	)
Operating income	431,219
Interest expense	(81,471		)
Other income, net	174,635
Earnings before income taxes	524,383
Income tax benefit	15,887
Net earnings	540,270
Net earnings attributable to noncontrolling interests	(105,061		)
Net earnings attributable to IAC shareholders	$	435,209



	Nine Months Ended September 30, 2017
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	232,854		$	53,627	$	23,619	$	1,208	$	4,397	$	315,705
ANGI Homeservices	(115,258		)	$	120,280	$	9,705	$	6,885	$	—	$	21,612
Video	(25,227		)	$	267	$	1,637	$	937	$	—	$	(22,386	)
Applications	101,288			$	—	$	3,087	$	1,633	$	548	$	106,556
Publishing	(2,968		)	$	—	$	4,011	$	9,964	$	—	$	11,007
Other	(5,621		)	$	1,729	$	836	$	1,524	$	—	$	(1,532	)
Corporate	(90,962		)	$	31,459	$	12,595	$	—	$	—	$	(46,908	)
Operating income	94,106
Interest expense	(74,556		)
Other expense, net	(7,700		)
Earnings before income taxes	11,850
Income tax benefit	322,809
Net earnings	334,659
Net earnings attributable to noncontrolling interests	(62,539		)
Net earnings attributable to IAC shareholders	$	272,120

OTHER INCOME (EXPENSE), NET

9 Months Ended

Sep. 30, 2018

Other Income and Expenses [Abstract]

OTHER INCOME (EXPENSE), NET



	Three Months Ended September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
	(In thousands)
Other income (expense), net	$8,113	$(10,216)	$174,635	$(7,700)

Other income (expense), net consists of:

Three months ended September 30, 2018 and 2017

Other income, net in 2018 includes: $8.1 million of interest income; $0.8 million in net foreign currency exchange gains due primarily to the strengthening of the dollar relative to the British Pound; $0.7 million in realized gains related to the sales of certain investments; and $0.8 million mark-to-market charge pertaining to a subsidiary denominated equity instrument.

Other expense, net in 2017 includes: $10.2 million in net foreign currency exchange losses due primarily to the weakening of the dollar relative to the British Pound and Euro; $2.9 million in other-than-temporary impairment charges related to certain cost method investments; $2.1 million expense related to the repricing of the Match Group Term Loan; $1.5 million mark-to-market charge pertaining to a subsidiary denominated equity award held by a non-employee; $4.5 million in realized gains related to the sales of certain investments; and $2.9 million of interest income.

Nine months ended September 30, 2018 and 2017

Other income, net in 2018 includes: $126.4 million of net unrealized gains related to certain equity investments that were adjusted to fair value in accordance with ASU No. 2016-01, which was adopted on January 1, 2018; $27.9 million in realized gains related to the sale of certain equity investments; $20.2 million of interest income; $2.9 million in net foreign currency exchange gains due primarily to the strengthening of the dollar relative to the British Pound; and $1.3 million mark-to-market charge pertaining to a subsidiary denominated equity instrument.

Other expense, net in 2017 includes: $16.3 million in net foreign currency exchange losses due primarily to the weakening of the dollar relative to the British Pound and Euro; $12.2 million mark-to-market charge pertaining to a subsidiary denominated equity award held by a non-employee; $7.7 million in other-than-temporary impairment charges related to certain cost method investments; $2.1 million expense related to the repricing of the Match Group Term Loan; $1.2 million loss from the sale of The Princeton Review; $25.8 million in realized gains related to the sale of certain investments; and $7.1 million of interest income.

CONTINGENCIES	9 Months Ended
CONTINGENCIES	Sep. 30, 2018
Loss Contingency [Abstract]
CONTINGENCIES	CONTINGENCIES In the ordinary course of business, the Company is a party to various lawsuits. The Company establishes reserves for specific legal matters when it determines that the likelihood of an unfavorable outcome is probable and the loss is reasonably estimable. Management has also identified certain other legal matters where we believe an unfavorable outcome is not probable and, therefore, no reserve is established. Although management currently believes that resolving claims against us, including claims where an unfavorable outcome is reasonably possible, will not have a material impact on the liquidity, results of operations, or financial condition of the Company, these matters are subject to inherent uncertainties and management's view of these matters may change in the future. The Company also evaluates other contingent matters, including income and non-income tax contingencies, to assess the likelihood of an unfavorable outcome and estimated extent of potential loss. It is possible that an unfavorable outcome of one or more of these lawsuits or other contingencies could have a material impact on the liquidity, results of operations, or financial condition of the Company. See "Note 3—Income Taxes" for additional information related to income tax contingencies.

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION

9 Months Ended

Sep. 30, 2018

Guarantor and Nonguarantor Financial Statements [Abstract]

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION

The 4.75% Senior Notes are unconditionally guaranteed, jointly and severally, by certain domestic subsidiaries which are 100% owned by the Company. The following tables present condensed consolidating financial information at September 30, 2018 and December 31, 2017 and for the three and nine months ended September 30, 2018 and 2017 for: IAC, on a stand-alone basis; the combined guarantor subsidiaries of IAC; the combined non-guarantor subsidiaries of IAC; and IAC on a consolidated basis.

Balance sheet at September 30, 2018:



	IAC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Cash and cash equivalents	$	739,157	$	—	$	931,827		$	—		$	1,670,984
Marketable securities	173,140		—		35,415			—			208,555
Accounts receivable, net of allowance	—		100,837		246,321			—			347,158
Other current assets	43,501		32,036		170,660			—			246,197
Intercompany receivables	—		1,225,467		—			(1,225,467		)	—
Property and equipment, net of accumulated depreciation and amortization	5,707		166,151		136,607			—			308,465
Goodwill	—		412,009		2,160,212			—			2,572,221
Intangible assets, net of accumulated amortization	—		73,524		550,578			—			624,102
Investment in subsidiaries	1,888,607		198,380		—			(2,086,987		)	—
Other non-current assets	220,674		83,101		223,597			(132,707		)	394,665
Total assets	$	3,070,786	$	2,291,505	$	4,455,217		$	(3,445,161	)	$	6,372,347

Current portion of long-term debt	$	—	$	—	$	13,750		$	—		$	13,750
Accounts payable, trade	884		38,487		36,822			—			76,193
Other current liabilities	39,385		91,104		673,073			—			803,562
Long-term debt, net	34,248		—		1,949,745			—			1,983,993
Income taxes payable	—		1,649		23,592			—			25,241
Intercompany liabilities	395,463		—		830,004			(1,225,467		)	—
Other long-term liabilities	324		18,059		185,810			(132,707		)	71,486
Redeemable noncontrolling interests	—		—		69,530			—			69,530
Shareholders' equity (deficit)	2,600,482		2,142,206		(55,219		)	(2,086,987		)	2,600,482
Noncontrolling interests	—		—		728,110			—			728,110
Total liabilities and shareholders' equity	$	3,070,786	$	2,291,505	$	4,455,217		$	(3,445,161	)	$	6,372,347

Balance sheet at December 31, 2017:



	IAC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			IAC Consolidated
	(In thousands)
Cash and cash equivalents	$	585,639	$	—	$	1,045,170	$	—		$	1,630,809
Marketable securities	4,995		—		—		—			4,995
Accounts receivable, net of allowance	31		109,289		194,707		—			304,027
Other current assets	49,159		33,387		102,828		—			185,374
Intercompany receivables	—		668,703		—		(668,703		)	—
Property and equipment, net of accumulated depreciation and amortization	2,811		174,323		138,036		—			315,170
Goodwill	—		412,010		2,147,056		—			2,559,066
Intangible assets, net of accumulated amortization	—		74,852		588,885		—			663,737
Investment in subsidiaries	2,077,898		554,998		—		(2,632,896		)	—
Other non-current assets	170,073		87,306		79,688		(132,435		)	204,632
Total assets	$	2,890,606	$	2,114,868	$	4,296,370	$	(3,434,034	)	$	5,867,810

Current portion of long-term debt	$	—	$	—	$	13,750	$	—		$	13,750
Accounts payable, trade	5,163		30,469		40,939		—			76,571
Other current liabilities	29,489		88,050		591,868		—			709,407
Long-term debt, net	34,572		—		1,944,897		—			1,979,469
Income taxes payable	16		1,605		24,003		—			25,624
Intercompany liabilities	390,827		—		277,876		(668,703		)	—
Other long-term liabilities	511		18,613		186,610		(132,435		)	73,299
Redeemable noncontrolling interests	—		—		42,867		—			42,867
Shareholders' equity	2,430,028		1,976,131		656,765		(2,632,896		)	2,430,028
Noncontrolling interests	—		—		516,795		—			516,795
Total liabilities and shareholders' equity	$	2,890,606	$	2,114,868	$	4,296,370	$	(3,434,034	)	$	5,867,810

Statement of operations for the three months ended September 30, 2018:



	IAC			Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	212,892	$	891,771		$	(71	)	$	1,104,592
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	19			68,748		168,524			(53		)	237,238
Selling and marketing expense	225			79,865		306,747			(35		)	386,802
General and administrative expense	37,021			7,238		146,627			17			190,903
Product development expense	155			14,395		63,190			—			77,740
Depreciation	271			3,009		15,645			—			18,925
Amortization of intangibles	—			409		19,743			—			20,152
Total operating costs and expenses	37,691			173,664		720,476			(71		)	931,760
Operating (loss) income	(37,691		)	39,228		171,295			—			172,832
Equity in earnings of unconsolidated affiliates	162,497			14,555		—			(177,052		)	—
Interest expense	(424		)	—		(27,186		)	—			(27,610		)
Other (expense) income, net ^(a)	(3,812		)	29,367		3,826			(21,268		)	8,113
Earnings before income taxes	120,570			83,150		147,935			(198,320		)	153,335
Income tax benefit (provision)	25,204			310		(7,272		)	—			18,242
Net earnings	145,774			83,460		140,663			(198,320		)	171,577
Net earnings attributable to noncontrolling interests	—			—		(25,803		)	—			(25,803		)
Net earnings attributable to IAC shareholders	$	145,774		$	83,460	$	114,860		$	(198,320	)	$	145,774
Comprehensive income attributable to IAC shareholders	$	145,245		$	92,277	$	122,765		$	(215,042	)	$	145,245

____________________


^(a)	During the three months ended September 30, 2018, foreign cash of $20 million was repatriated to the U.S.

Statement of operations for the three months ended September 30, 2017:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	185,386		$	643,175		$	(127	)	$	828,434
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	—			41,741			124,676			(127		)	166,290
Selling and marketing expense	311			84,416			268,182			(30		)	352,879
General and administrative expense	32,060			15,404			188,086			30			235,580
Product development expense	592			13,145			56,908			—			70,645
Depreciation	407			4,338			12,518			—			17,263
Amortization of intangibles	—			350			4,016			—			4,366
Total operating costs and expenses	33,370			159,394			654,386			(127		)	847,023
Operating (loss) income	(33,370		)	25,992			(11,211		)	—			(18,589		)
Equity in earnings of unconsolidated affiliates	203,817			489			—			(204,306		)	—
Interest expense	(5,484		)	—			(19,552		)	—			(25,036		)
Other (expense) income, net	(8,157		)	8,309			(10,368		)	—			(10,216		)
Earnings (loss) before income taxes	156,806			34,790			(41,131		)	(204,306		)	(53,841		)
Income tax benefit (provision)	22,837			(11,616		)	268,259			—			279,480
Net earnings	179,643			23,174			227,128			(204,306		)	225,639
Net earnings attributable to noncontrolling interests	—			—			(45,996		)	—			(45,996		)
Net earnings attributable to IAC shareholders	$	179,643		$	23,174		$	181,132		$	(204,306	)	$	179,643
Comprehensive income attributable to IAC shareholders	$	216,868		$	3,682		$	225,089		$	(228,771	)	$	216,868

Statement of operations for the nine months ended September 30, 2018:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	633,745		$	2,525,271		$	(227	)	$	3,158,789
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	170			186,187			471,227			(160		)	657,424
Selling and marketing expense	627			250,305			908,478			(116		)	1,159,294
General and administrative expense	100,082			36,878			426,441			49			563,450
Product development expense	1,371			42,815			185,936			—			230,122
Depreciation	803			9,475			46,709			—			56,987
Amortization of intangibles	—			1,328			58,965			—			60,293
Total operating costs and expenses	103,053			526,988			2,097,756			(227		)	2,727,570
Operating (loss) income	(103,053		)	106,757			427,515			—			431,219
Equity in earnings of unconsolidated affiliates	517,349			19,282			—			(536,631		)	—
Interest expense	(1,276		)	—			(80,195		)	—			(81,471		)
Other (expense) income, net ^(b)	(14,223		)	378,454			159,786			(349,382		)	174,635
Earnings before income taxes	398,797			504,493			507,106			(886,013		)	524,383
Income tax benefit (provision)	36,412			(22,815		)	2,290			—			15,887
Net earnings	435,209			481,678			509,396			(886,013		)	540,270
Net earnings attributable to noncontrolling interests	—			—			(105,061		)	—			(105,061		)
Net earnings attributable to IAC shareholders	$	435,209		$	481,678		$	404,335		$	(886,013	)	$	435,209
Comprehensive income attributable to IAC shareholders	$	425,593		$	490,542		$	401,429		$	(891,971	)	$	425,593

________________________


^(b)	During the nine months ended September 30, 2018, foreign cash of $346 million was repatriated to the U.S.

Statement of operations for the nine months ended September 30, 2017:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	536,789		$	1,820,373		$	(508	)	$	2,356,654
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	160			104,580			346,975			(434		)	451,281
Selling and marketing expense	1,250			258,634			763,640			(130		)	1,023,394
General and administrative expense	93,974			45,779			389,588			56			529,397
Product development expense	2,098			42,324			136,413			—			180,835
Depreciation	1,290			17,355			36,845			—			55,490
Amortization of intangibles	—			10,102			12,049			—			22,151
Total operating costs and expenses	98,772			478,774			1,685,510			(508		)	2,262,548
Operating (loss) income	(98,772		)	58,015			134,863			—			94,106
Equity in earnings of unconsolidated affiliates	346,655			2,512			—			(349,167		)	—
Interest expense	(16,960		)	—			(57,596		)	—			(74,556		)
Other (expense) income, net	(20,783		)	21,207			(8,124		)	—			(7,700		)
Earnings before income taxes	210,140			81,734			69,143			(349,167		)	11,850
Income tax benefit (provision)	61,980			(22,444		)	283,273			—			322,809
Net earnings	272,120			59,290			352,416			(349,167		)	334,659
Net earnings attributable to noncontrolling interests	—			—			(62,539		)	—			(62,539		)
Net earnings attributable to IAC shareholders	$	272,120		$	59,290		$	289,877		$	(349,167	)	$	272,120
Comprehensive income attributable to IAC shareholders	$	338,730		$	46,025		$	373,997		$	(420,022	)	$	338,730

Statement of cash flows for the nine months ended September 30, 2018:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities	$	(30,873	)	$	502,225		$	548,884		$	(348,536	)	$	671,700
Cash flows from investing activities:
Acquisitions, net of cash acquired	(4,142		)	—			(13,493		)	—			(17,635		)
Capital expenditures	(3,960		)	(1,288		)	(54,865		)	—			(60,113		)
Proceeds from maturities and sales of marketable debt securities	125,000			—			—			—			125,000
Purchases of marketable debt securities	(292,090		)	—			(34,816		)	—			(326,906		)
Purchases of investments	(19,180		)	—			(13,000		)	—			(32,180		)
Net proceeds from the sale of investments and businesses	408			—			28,222			—			28,630
Other, net	(5,000		)	3,908			10,738			—			9,646
Net cash (used in) provided by investing activities	(198,964		)	2,620			(77,214		)	—			(273,558		)
Cash flows from financing activities:
Repurchases of IAC debt	(363		)	—			—			—			(363		)
Principal payments on ANGI Homeservices debt	—			—			(10,313		)	—			(10,313		)
Purchase of IAC treasury stock	(82,891		)	—			—			—			(82,891		)
Purchase of Match Group treasury stock	—			—			(86,239		)	—			(86,239		)
Proceeds from the exercise of IAC stock options	38,903			—			—			—			38,903
Proceeds from the exercise of Match Group and ANGI Homeservices stock options	—			—			2,876			—			2,876
Withholding taxes paid on behalf of IAC employees on net settled stock-based awards	(3,011		)	—			—			—			(3,011		)
Withholding taxes paid on behalf of Match Group and ANGI Homeservices employees on net settled stock-based awards	—			—			(208,962		)	—			(208,962		)
Purchase of noncontrolling interests	—			—			(4,798		)	—			(4,798		)
Acquisition-related contingent consideration payments	—			—			(185		)	—			(185		)
Intercompany	427,698			(504,845		)	(271,389		)	348,536			—
Other, net	2,674			—			(7,547		)	—			(4,873		)
Net cash provided by (used in) financing activities	383,010			(504,845		)	(586,557		)	348,536			(359,856		)
Total cash provided (used)	153,173			—			(114,887		)	—			38,286
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	345			—			(552		)	—			(207		)
Net increase (decrease) in cash, cash equivalents, and restricted cash	153,518			—			(115,439		)	—			38,079
Cash, cash equivalents, and restricted cash at beginning of period	585,639			—			1,048,043			—			1,633,682
Cash, cash equivalents, and restricted cash at end of period	$	739,157		$	—		$	932,604		$	—		$	1,671,761

Statement of cash flows for the nine months ended September 30, 2017:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities	$	(35,286	)	$	75,892		$	257,195		$	—		$	297,801
Cash flows from investing activities:
Acquisitions, net of cash acquired	—			(2,200		)	(66,913		)	—			(69,113		)
Capital expenditures	(337		)	(903		)	(55,279		)	—			(56,519		)
Proceeds from maturities and sales of marketable debt securities	114,350			—			—			—			114,350
Purchases of marketable debt securities	(24,909		)	—			—			—			(24,909		)
Purchases of investments	—			—			(9,105		)	—			(9,105		)
Net proceeds from the sale of businesses and investments	911			—			124,309			—			125,220
Intercompany	(123,893		)	—			—			123,893			—
Other, net	—			307			1,012			—			1,319
Net cash (used in) provided by investing activities	(33,878		)	(2,796		)	(5,976		)	123,893			81,243
Cash flows from financing activities:
Repurchases of IAC debt	(31,590		)	—			—			—			(31,590		)
Proceeds from the issuance of Match Group debt	—			—			75,000			—			75,000
Purchase of IAC treasury stock	(56,424		)	—			—			—			(56,424		)
Proceeds from the exercise of IAC stock options	69,065			—			—			—			69,065
Proceeds from the exercise of Match Group stock options	—			—			57,705			—			57,705
Withholding taxes paid on behalf of IAC employees on net settled stock-based awards	(57,180		)	—			—			—			(57,180		)
Withholding taxes paid on behalf of Match Group employees on net settled stock-based awards	—			—			(228,978		)	—			(228,978		)
Purchase of Match Group stock-based awards	—			—			(272,459		)	—			(272,459		)
Purchase of noncontrolling interests	—			—			(13,011		)	—			(13,011		)
Acquisition-related contingent consideration payments	—			—			(27,289		)	—			(27,289		)
Debt issuance costs	—			—			(2,637		)	—			(2,637		)
Intercompany	73,095			(73,096		)	123,894			(123,893		)	—
Other, net	251			—			(5,253		)	—			(5,002		)
Net cash used in financing activities	(2,783		)	(73,096		)	(293,028		)	(123,893		)	(492,800		)
Total cash used	(71,947		)	—			(41,809		)	—			(113,756		)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	81			—			9,320			—			9,401
Net decrease in cash, cash equivalents, and restricted cash	(71,866		)	—			(32,489		)	—			(104,355		)
Cash, cash equivalents, and restricted cash at beginning of period	573,784			—			786,415			—			1,360,199
Cash, cash equivalents, and restricted cash at end of period	$	501,918		$	—		$	753,926		$	—		$	1,255,844

SUBSEQUENT EVENTS

9 Months Ended

Sep. 30, 2018

Subsequent Events [Abstract]

SUBSEQUENT EVENTS

On November 6, 2018, MTCH declared a special dividend of $2.00 per share on MTCH common stock and Class B common stock, payable on December 19, 2018 to shareholders of record on December 5, 2018. Based on MTCH's current shares outstanding, the total amount of this dividend will be an aggregate of approximately $560 million, of which approximately $450 million will be paid to IAC. The special dividend will be funded with cash on hand and incremental debt, as necessary.

On November 5, 2018,


•	the IAC Credit Facility was amended and restated, reducing the facility size from $300 million to $250 million, and now expires on November 5, 2023.

•

ANGI entered into a five-year $250 million revolving credit facility (the "ANGI Credit Facility"). The annual commitment fee on undrawn funds is currently 25 basis points and is based on the net leverage ratio most recently reported. Borrowings under the ANGI Credit Facility bear interest, at ANGI's option, at either a base rate or LIBOR, in each case plus an applicable margin, which is determined by reference to a pricing grid based on ANGI's consolidated net leverage ratio. The terms of the ANGI Homeservices Credit Facility require ANGI to maintain a net leverage ratio of not more than 4.5 to 1.0 and a minimum interest coverage ratio of not less than 2.0 to 1.0.

•

ANGI Term Loan was amended and restated, and is now due on November 5, 2023. Interest payments continue to be due at least quarterly through the term of the loan and quarterly principal payments of 1.25% of the original principal amount in the first three years from the amendment date, 2.5% in the fourth year and 3.75% in the fifth year are required. The financial covenants are the same as those for the ANGI Credit Facility.

On October 1, 2018, the Company entered into an agreement to sell Dictionary LLC, which is part of the Publishing segment; the transaction is expected to close in the fourth quarter of 2018. In addition, on October 29, 2018, the Company sold the television business of Electus, which was part of the Video segment. The combined proceeds from the two transactions are expected to be approximately $130 million.

In October 2018, IAC acquired TelTech, a developer of mobile applications, including RoboKiller and TapeACall, within its Applications segment.

In October 2018, ANGI completed the acquisition of Handy Technologies, Inc. ("Handy"), an on-demand platform and gig marketplace connecting people looking for household services with independent, pre-screened professionals. ANGI issued approximately 8.6 million shares of its Class A common stock in connection with the Handy transaction.

On October 10, 2018, IAC was issued approximately 5.1 million shares of Class B common stock of ANGI pursuant to post-closing adjustment provision of the Angie's List merger agreement.

The Company will change its segment reporting in the fourth quarter of 2018. Dotdash and Vimeo will be moved from the Publishing and Video segments and each will be reported as its own segment. The other businesses within the Publishing and Video segments will be moved to the Emerging & Other segment (formerly the Other segment).

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of Operations

All references to "IAC," the "Company," "we," "our" or "us" in this report are to IAC/InterActiveCorp.

Basis of Consolidation

The Company prepares its consolidated financial statements in accordance with U.S. generally accepted accounting principles ("GAAP").

Accounting for Investments

The Company prepares its consolidated financial statements in accordance with U.S. generally accepted accounting principles ("GAAP").

Accounting Estimates

Certain Risks and Concentrations

Recent Accounting Pronouncements

Accounting Pronouncements adopted by the Company

ASU No. 2014-09, Revenue from Contracts with Customers

•

The Company's disaggregated revenue disclosures are presented in "Note 9—Segment Information."



	Three Months Ended September 30, 2018									Nine Months Ended September 30, 2018
	Under ASC 606 (as reported)			Under ASC 605			Effect of adoption of ASU No. 2014-09			Under ASC 606 (as reported)			Under ASC 605			Effect of adoption of ASU No. 2014-09
	(In thousands)
Revenue by segment:
Match Group	$	443,943		$	443,943		$	—		$	1,272,506		$	1,272,506		$	—
ANGI Homeservices	303,116			303,116			—			853,249			853,249			—
Video	64,193			64,440			(247		)	193,112			194,049			(937		)
Applications	153,973			153,863			110			429,034			429,118			(84		)
Publishing	139,439			139,439			—			411,116			411,116			—
Inter-segment eliminations	(72		)	(72		)	—			(228		)	(228		)	—
Total	$	1,104,592		$	1,104,729		$	(137	)	$	3,158,789		$	3,159,810		$	(1,021	)



	Three Months Ended September 30, 2018							Nine Months Ended September 30, 2018
	Under ASC 606 (as reported)		Under ASC 605		Effect of adoption of ASU No. 2014-09			Under ASC 606 (as reported)		Under ASC 605		Effect of adoption of ASU No. 2014-09
	(In thousands)
Operating costs and expenses by segment:
Match Group	$	304,048	$	304,048	$	—		$	870,213	$	870,213	$	—
ANGI Homeservices	269,601		269,352		249			807,228		815,190		(7,962		)
Video	74,443		74,756		(313		)	234,219		234,941		(722		)
Applications	120,932		119,962		970			337,455		335,184		2,271
Publishing	122,041		122,041		—			365,100		365,100		—
Corporate	40,695		40,695		—			113,355		113,355		—
Total	$	931,760	$	930,854	$	906		$	2,727,570	$	2,733,983	$	(6,413	)



	Three Months Ended September 30, 2018									Nine Months Ended September 30, 2018
	Under ASC 606 (as reported)			Under ASC 605			Effect of adoption of ASU No. 2014-09			Under ASC 606 (as reported)			Under ASC 605			Effect of adoption of ASU No. 2014-09
	(In thousands)
Operating income (loss) by segment:
Match Group	$	139,895		$	139,895		$	—		$	402,293		$	402,293		$	—
ANGI Homeservices	33,515			33,764			(249		)	46,021			38,059			7,962
Video	(10,250		)	(10,316		)	66			(41,107		)	(40,892		)	(215		)
Applications	33,041			33,901			(860		)	91,579			93,934			(2,355		)
Publishing	17,398			17,398			—			46,016			46,016			—
Corporate	(40,767		)	(40,767		)	—			(113,583		)	(113,583		)	—
Total	$	172,832		$	173,875		$	(1,043	)	$	431,219		$	425,827		$	5,392



	Three Months Ended September 30, 2018							Nine Months Ended September 30, 2018
	Under ASC 606 (as reported)		Under ASC 605		Effect of adoption of ASU No. 2014-09			Under ASC 606 (as reported)		Under ASC 605		Effect of adoption of ASU No. 2014-09
	(In thousands)
Net earnings	$	171,577	$	172,235	$	(658	)	$	540,270	$	536,119	$	4,151

ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities

ASU No. 2016-18, Restricted Cash



	September 30, 2018		December 31, 2017		September 30, 2017		December 31, 2016
	(In thousands)
Cash and cash equivalents	$	1,670,984	$	1,630,809	$	1,255,317	$	1,329,187
Restricted cash included in other current assets	344		2,873		527		20,464
Restricted cash included in other assets	433		—		—		10,548
Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows	$	1,671,761	$	1,633,682	$	1,255,844	$	1,360,199

Restricted cash at December 31, 2017 primarily supports a letter of credit to a supplier, which was released to the Company in the second quarter of 2018.

ASU No. 2018-07, Improvements to Nonemployee Share-Based Payment Accounting

Accounting Pronouncement not yet adopted by the Company

ASU No. 2016-02, Leases (Topic 842)


•	the Company has selected a software solution to implement ASU No. 2016-02;


•	the Company has input lease summaries into the software solution;


•	the Company is assessing the other inputs required in connection with the adoption of ASU No. 2016-02; and


•	the Company is developing its accounting policy, procedures and internal controls related to the new standard.

Reclassifications

Certain prior year amounts have been reclassified to conform to the current year presentation.

General Revenue Recognition

The Company accounts for a contract when it has approval and commitment from all parties, the rights of the parties and payment terms are identified, the contract has commercial substance and collectability of consideration is probable. Revenue is recognized when control of the promised services or goods is transferred to our customers, and in an amount that reflects the consideration the Company is contractually due in exchange for those services or goods.

Match Group

Match Group revenue is primarily derived directly from users in the form of recurring subscriptions. Subscription revenue is presented net of credits and credit card chargebacks. Subscribers pay in advance, primarily by credit card or through mobile app stores, and, subject to certain conditions identified in our terms and conditions, generally all purchases are final and nonrefundable. Revenue is initially deferred and is recognized using the straight-line method over the term of the applicable subscription period, which primarily range from one to six months. Revenue is also earned from online advertising, the purchase of à la carte features and offline events. Online advertising revenue is recognized when an advertisement is displayed. Revenue from the purchase of à la carte features is recognized based on usage. Revenue associated with offline events is recognized when each event occurs.

ANGI Homeservices

ANGI revenue is primarily derived from (i) consumer connection revenue, which comprises fees paid by service professionals for consumer matches (regardless of whether the professional ultimately provides the requested service), and (ii) membership subscription fees paid by service professionals. Consumer connection revenue varies based upon several factors, including the service requested, type of match and geographic location of service. The Company’s consumer connection revenue is generated and recognized when an in-network service professional is delivered a consumer match. Membership subscription revenue from service professionals is initially deferred and is recognized using the straight-line method over the applicable subscription period, which is typically one year. Consumer connection revenue is generally billed one week following a consumer match, with payment due upon receipt of invoice.

ANGI revenue is also derived from Angie's List (i) sales of time-based website, mobile and call center advertising to service professionals and (ii) membership subscription fees from consumers. Angie's List service professionals generally pay for advertisements in advance on a monthly or annual basis at the option of the service professional, with the average advertising contract term being approximately one year. Angie's List website, mobile and call center advertising revenue is recognized ratably over the contract term. Revenue from the sale of advertising in the Angie’s List Magazine is recognized in the period in which the publication is distributed. Angie's List prepaid consumer membership subscription fees are recognized as revenue using the straight-line method over the term of the applicable subscription period, which is typically one year.

Video

Revenue of businesses in this segment is generated primarily through subscriptions, media production and distribution, and advertising. Subscription fee revenue is recognized over the terms of the applicable subscription period, which are one month or one year, production revenue is recognized when control is transferred to the customer to broadcast or exhibit, and advertising revenue is recognized when an advertisement is displayed or over the advertising period.

Applications

Applications revenue largely consists of advertising revenue generated principally through the display of paid listings in response to search queries. The substantial majority of the paid listings displayed by our Applications businesses are supplied to us by Google pursuant to our services agreement with Google.

Pursuant to this agreement, those of our Applications businesses that provide search services transmit search queries to Google, which in turn transmits a set of relevant and responsive paid listings back to these businesses for display in search results. This ad-serving process occurs independently of, but concurrently with, the generation of algorithmic search results for the same search queries. Google paid listings are displayed separately from algorithmic search results and are identified as sponsored listings on search results pages. Paid listings are priced on a price per click basis and when a user submits a search query through one of our Applications businesses and then clicks on a Google paid listing displayed in response to the query, Google bills the advertiser that purchased the paid listing directly and shares a portion of the fee charged to the advertiser with us. The Company recognizes paid listing revenue from Google when it delivers the user's click. In cases where the user’s click is generated due to the efforts of a third-party distributor, we recognize the amount due from Google as revenue and record a revenue share or other payment obligation to the third-party distributor as traffic acquisition costs.

To a lesser extent, Applications revenue also consists of fees related to subscription downloadable desktop and mobile applications as well as display advertisements. Fees related to subscription downloadable desktop and paid mobile applications are generally recognized at the time of the sale when the software license is delivered. To the extent updates or maintenance is required or expected, revenue is recognized over the term of the applicable subscription period, which is primarily one or two years. Fees related to display advertisements are recognized when an advertisement is displayed.

Publishing

Publishing revenue consists principally of advertising revenue, which is generated primarily through the display of paid listings in response to search queries and display advertisements (sold directly and through programmatic ad sales). The majority of the paid listings that our Publishing businesses display are supplied to us by Google in the manner, and pursuant to the services agreement with Google, described above under "Applications."

Transaction Price

The objective of determining the transaction price is to estimate the amount of consideration the Company is due in exchange for its services or goods, including amounts that are variable. The Company determines the total transaction price, including an estimate of any variable consideration, at contract inception and reassesses this estimate each reporting period.

The Company excludes from the measurement of transaction price all taxes assessed by governmental authorities that are both (i) imposed on and concurrent with a specific revenue-producing transaction and (ii) collected from customers. Accordingly, such tax amounts are not included as a component of revenue or cost of revenue.

For contracts that have an original duration of one year or less, the Company uses the practical expedient available under ASU No. 2014-09 applicable to such contracts and does not consider the time value of money.

Accounts Receivables, net of allowance for doubtful accounts and revenue reserves

Accounts receivable include amounts billed and currently due from customers. The Company maintains an allowance for doubtful accounts to provide for the estimated amount of accounts receivables that will not be collected. The allowance for doubtful accounts is based upon a number of factors, including the length of time accounts receivable are past due, the Company’s previous loss history and the specific customer’s ability to pay its obligation. The time between the Company issuance of an invoice and payments due date is not significant; customer payments that are not collected in advance of the transfer of promised services or goods are generally due no later than 30 days from invoice date. The Company also maintains allowances to reserve for potential credits issued to consumers or other revenue adjustments. The amounts of these reserves are based primarily upon historical experience.

Deferred Revenue

Deferred revenue consists of advance payments that are received or due in advance of the Company's performance. The Company’s deferred revenue is reported on a contract by contract basis at the end of each reporting period. The Company generally classifies deferred revenue as current when the term of the applicable subscription period or expected completion of our performance obligation is one year or less. The deferred revenue balance as of January 1, 2018 is $332.2 million. During the nine months ended September 30, 2018, the Company recognized $317.2 million of revenue that was included in the deferred revenue balance as of January 1, 2018. The deferred revenue balance as of June 30, 2018 is $377.2 million. During the three months ended September 30, 2018, the Company recognized $220.4 million of revenue that was included in the deferred revenue balance as of July 1, 2018. The current and non-current deferred revenue balances at September 30, 2018 are $381.4 million and $1.8 million, respectively. Non-current deferred revenue is included in “Other long-term liabilities” in the accompanying consolidated balance sheet.

Arrangements with Multiple Performance Obligations

The Company’s contracts with customers may include multiple performance obligations. For such arrangements, the Company allocates revenue to each performance obligation based on its relative standalone selling price. The Company generally determines standalone selling prices based on the prices charged to customers, which are directly observable or based on an estimate if not directly observable. For our multiple performance obligation arrangements that include functional intellectual property ("IP"), which comprise the downloadable apps and software of the Applications segment, the Company uses a residual approach to determine standalone selling prices for the functional IP.

Assets Recognized from the Costs to Obtain a Contract with a Customer

The Company has determined that certain costs, primarily commissions paid to employees pursuant to certain sales incentive programs and mobile app store fees, meet the requirements to be capitalized as a cost of obtaining a contract. Commissions paid to employees pursuant to certain sales incentive programs are amortized over the estimated customer relationship period. The Company calculates the estimated customer relationship period as the average customer life, which is based on historical data. When customer renewals are expected and the renewal commission is not commensurate with the initial commission, the average customer life includes renewal periods. For sales incentive programs where the customer relationship period is one year or less, the Company has elected the practical expedient to expense the costs as incurred. The Company generally capitalizes and amortizes mobile app store fees over the term of the applicable subscription.

During the three and nine months ended September 30, 2018, the Company recognized expense of $94.4 million and $254.3 million, respectively, related to the amortization of these costs. The current and non-current contract asset balances at September 30, 2018 are $69.9 million and $5.6 million, respectively. The current and non-current contract assets are included in “Other current assets” and "Other non-current assets," respectively, in the accompanying consolidated balance sheet.

Performance Obligations

As permitted under the practical expedient available under ASU No. 2014-09, the Company does not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less, (ii) contracts with variable consideration that is allocated entirely to unsatisfied performance obligations or to a wholly unsatisfied promise accounted for under the series guidance, and (iii) contracts for which the Company recognizes revenue at the amount which we have the right to invoice for services performed.

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles



	Three Months Ended September 30, 2018									Nine Months Ended September 30, 2018
	Under ASC 606 (as reported)			Under ASC 605			Effect of adoption of ASU No. 2014-09			Under ASC 606 (as reported)			Under ASC 605			Effect of adoption of ASU No. 2014-09
	(In thousands)
Revenue by segment:
Match Group	$	443,943		$	443,943		$	—		$	1,272,506		$	1,272,506		$	—
ANGI Homeservices	303,116			303,116			—			853,249			853,249			—
Video	64,193			64,440			(247		)	193,112			194,049			(937		)
Applications	153,973			153,863			110			429,034			429,118			(84		)
Publishing	139,439			139,439			—			411,116			411,116			—
Inter-segment eliminations	(72		)	(72		)	—			(228		)	(228		)	—
Total	$	1,104,592		$	1,104,729		$	(137	)	$	3,158,789		$	3,159,810		$	(1,021	)



	Three Months Ended September 30, 2018							Nine Months Ended September 30, 2018
	Under ASC 606 (as reported)		Under ASC 605		Effect of adoption of ASU No. 2014-09			Under ASC 606 (as reported)		Under ASC 605		Effect of adoption of ASU No. 2014-09
	(In thousands)
Operating costs and expenses by segment:
Match Group	$	304,048	$	304,048	$	—		$	870,213	$	870,213	$	—
ANGI Homeservices	269,601		269,352		249			807,228		815,190		(7,962		)
Video	74,443		74,756		(313		)	234,219		234,941		(722		)
Applications	120,932		119,962		970			337,455		335,184		2,271
Publishing	122,041		122,041		—			365,100		365,100		—
Corporate	40,695		40,695		—			113,355		113,355		—
Total	$	931,760	$	930,854	$	906		$	2,727,570	$	2,733,983	$	(6,413	)



	Three Months Ended September 30, 2018									Nine Months Ended September 30, 2018
	Under ASC 606 (as reported)			Under ASC 605			Effect of adoption of ASU No. 2014-09			Under ASC 606 (as reported)			Under ASC 605			Effect of adoption of ASU No. 2014-09
	(In thousands)
Operating income (loss) by segment:
Match Group	$	139,895		$	139,895		$	—		$	402,293		$	402,293		$	—
ANGI Homeservices	33,515			33,764			(249		)	46,021			38,059			7,962
Video	(10,250		)	(10,316		)	66			(41,107		)	(40,892		)	(215		)
Applications	33,041			33,901			(860		)	91,579			93,934			(2,355		)
Publishing	17,398			17,398			—			46,016			46,016			—
Corporate	(40,767		)	(40,767		)	—			(113,583		)	(113,583		)	—
Total	$	172,832		$	173,875		$	(1,043	)	$	431,219		$	425,827		$	5,392



	Three Months Ended September 30, 2018							Nine Months Ended September 30, 2018
	Under ASC 606 (as reported)		Under ASC 605		Effect of adoption of ASU No. 2014-09			Under ASC 606 (as reported)		Under ASC 605		Effect of adoption of ASU No. 2014-09
	(In thousands)
Net earnings	$	171,577	$	172,235	$	(658	)	$	540,270	$	536,119	$	4,151

Schedule of Cash, Cash Equivalents, and Restricted Cash



	September 30, 2018		December 31, 2017		September 30, 2017		December 31, 2016
	(In thousands)
Cash and cash equivalents	$	1,670,984	$	1,630,809	$	1,255,317	$	1,329,187
Restricted cash included in other current assets	344		2,873		527		20,464
Restricted cash included in other assets	433		—		—		10,548
Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows	$	1,671,761	$	1,633,682	$	1,255,844	$	1,360,199

Schedule of Cash, Cash Equivalents, and Restricted Cash



	September 30, 2018		December 31, 2017		September 30, 2017		December 31, 2016
	(In thousands)
Cash and cash equivalents	$	1,670,984	$	1,630,809	$	1,255,317	$	1,329,187
Restricted cash included in other current assets	344		2,873		527		20,464
Restricted cash included in other assets	433		—		—		10,548
Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows	$	1,671,761	$	1,633,682	$	1,255,844	$	1,360,199

BUSINESS COMBINATION (Tables)

9 Months Ended

Sep. 30, 2018

Business Combinations [Abstract]

Schedule of Pro Forma Financial Information



	Three Months Ended September 30, 2017		Nine Months Ended September 30, 2017
	(In thousands, except per share data)
Revenue	$	898,584	$	2,571,613
Net earnings attributable to IAC shareholders	$	244,400	$	313,054
Basic earnings per share attributable to IAC shareholders	$	3.02	$	3.94
Diluted earnings per share attributable to IAC shareholders	$	2.80	$	3.70

FINANCIAL INSTRUMENTS (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Marketable Securities

At September 30, 2018 and December 31, 2017, the fair value of marketable securities are as follows:



	September 30, 2018		December 31, 2017
	(In thousands)
Available-for-sale marketable debt securities	$	208,005	$	4,995
Marketable equity security	550		—
Total marketable securities	$	208,555	$	4,995

Schedule of Current Available-for-sale Marketable Securities

At December 31, 2017, current available-for-sale marketable debt securities are as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
Commercial paper	$	4,995	$	—	$	—	$	4,995
Total available-for-sale marketable debt securities	$	4,995	$	—	$	—	$	4,995

At September 30, 2018, current available-for-sale marketable debt securities are as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Treasury discount notes	$	171,974	$	—	$	(10	)	$	171,964
Commercial paper	36,041		—		—			36,041
Total available-for-sale marketable debt securities	$	208,015	$	—	$	(10	)	$	208,005

Schedule of Proceeds from Maturities and Sales of Available-for-sale Marketable Debt Securities

The following table presents the proceeds from maturities and sales of available-for-sale marketable debt securities:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
	(In thousands)
Proceeds from maturities and sales of available-for-sale marketable debt securities	$	115,000	$	15,000	$	125,000	$	114,350

Schedule of Realized and Unrealized Gains and Losses



	Three Months Ended September 30, 2018		Nine Months Ended September 30, 2018
	(In thousands)
Upward adjustments (gross unrealized gains)	$	—	$	128,786
Downward adjustments (including impairment) (gross unrealized losses)	—		(2,588		)
Total	$	—	$	126,198



	Three Months Ended September 30, 2018			Nine Months Ended September 30, 2018
	(In thousands)
Realized gains, net, for equity securities sold	$	702		$	27,874
Unrealized (losses) gains, net, on equity securities held	(115		)	126,444
Total gains recognized, net, in other income, net	$	587		$	154,318

Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following tables present the Company's financial instruments that are measured at fair value on a recurring basis:



	September 30, 2018
	Quoted Market Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value Measurements
	(In thousands)
Assets:
Cash equivalents:
Money market funds	$	745,046	$	—	$	—		$	745,046
Treasury discount notes	—		194,843		—			194,843
Commercial paper	—		157,808		—			157,808
Time deposits	—		105,034		—			105,034
Marketable securities:
Treasury discount notes	—		171,964		—			171,964
Commercial paper	—		36,041		—			36,041
Marketable equity security	550		—		—			550
Total	$	745,596	$	665,690	$	—		$	1,411,286

Liabilities:
Contingent consideration arrangements	$	—	$	—	$	(1,980	)	$	(1,980	)



	December 31, 2017
	Quoted Market Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value Measurements
	(In thousands)
Assets:
Cash equivalents:
Money market funds	$	780,425	$	—	$	—		$	780,425
Treasury discount notes	—		100,457		—			100,457
Commercial paper	—		215,325		—			215,325
Time deposits	—		60,000		—			60,000
Certificates of deposit	—		6,195		—			6,195
Marketable securities:
Commercial paper	—		4,995		—			4,995
Total	$	780,425	$	386,972	$	—		$	1,167,397

Liabilities:
Contingent consideration arrangements	$	—	$	—	$	(2,647	)	$	(2,647	)

Schedule of Changes in Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)

The Company's financial instruments that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3) are its contingent consideration arrangements.



	Contingent Consideration Arrangements
	Three Months Ended September 30,
	2018			2017
	(In thousands)
Balance at July 1	$	(1,910	)	$	(24,829	)
Total net losses:
Included in earnings:
Fair value adjustments	(55		)	(60		)
Included in other comprehensive loss	(15		)	(332		)
Settlements	—			23,429
Balance at September 30	$	(1,980	)	$	(1,792	)



	Contingent Consideration Arrangements
	Nine Months Ended September 30,
	2018			2017
	(In thousands)
Balance at January 1	$	(2,647	)	$	(33,871	)
Total net losses:
Included in earnings:
Fair value adjustments	(265		)	(4,945		)
Included in other comprehensive loss	(16		)	(1,405		)
Settlements	948			38,429
Balance at September 30	$	(1,980	)	$	(1,792	)

Schedule of Carrying Value and the Fair Value of Financial Instruments Measured at Fair Value Only for Disclosure Purposes

The following table presents the carrying value and the fair value of financial instruments measured at fair value only for disclosure purposes:



	September 30, 2018						December 31, 2017
	Carrying Value			Fair Value			Carrying Value			Fair Value
	(In thousands)
Current portion of long-term debt	$	(13,750	)	$	(13,664	)	$	(13,750	)	$	(13,802	)
Long-term debt, net^(a)	(1,983,993		)	(2,353,160		)	(1,979,469		)	(2,168,108		)

_________________


^(a)	At September 30, 2018 and December 31, 2017, the carrying value of long-term debt, net includes unamortized original issue discount and debt issuance costs of $93.9 million and $109.1 million, respectively.

LONG-TERM DEBT (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt

Long-term debt consists of:



	September 30, 2018		December 31, 2017
	(In thousands)
MTCH Debt:
MTCH Term Loan due November 16, 2022	$	425,000	$	425,000
6.375% Senior Notes due June 1, 2024 (the "6.375% MTCH Senior Notes"); interest payable each June 1 and December 1	400,000		400,000
5.00% Senior Notes due December 15, 2027 (the "5.00% MTCH Senior Notes"); interest payable each June 15 and December 15	450,000		450,000
Total MTCH long-term debt	1,275,000		1,275,000
Less: unamortized original issue discount	7,681		8,668
Less: unamortized debt issuance costs	12,231		13,636
Total MTCH debt, net	1,255,088		1,252,696

ANGI Debt:
ANGI Term Loan due November 1, 2022	264,688		275,000
Less: current portion of ANGI Term Loan	13,750		13,750
Less: unamortized debt issuance costs	2,483		2,938
Total ANGI debt, net	248,455		258,312

IAC Debt:
0.875% Exchangeable Senior Notes due October 1, 2022 (the "Exchangeable Notes"); interest payable each April 1 and October 1	517,500		517,500
4.75% Senior Notes due December 15, 2022 (the "4.75% Senior Notes"); interest payable each June 15 and December 15	34,489		34,859
Total IAC long-term debt	551,989		552,359
Less: unamortized original issue discount	57,356		67,158
Less: unamortized debt issuance costs	14,183		16,740
Total IAC debt, net	480,450		468,461

Total long-term debt, net	$	1,983,993	$	1,979,469

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
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-Topic 835
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-Topic 505
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+ Details

ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Schedule of Accumulated Other Comprehensive (Loss) Income

The following tables present the components of accumulated other comprehensive (loss) income and items reclassified out of accumulated other comprehensive loss into earnings:



	Three Months Ended September 30, 2018
	Foreign Currency Translation Adjustment			Unrealized Gains (Losses) On Available-For-Sale Securities			Accumulated Other Comprehensive Loss
	(In thousands)
Balance as of July 1	$	(112,730	)	$	13		$	(112,717	)
Other comprehensive loss	(111		)	(27		)	(138		)
Balance as of September 30	$	(112,841	)	$	(14	)	$	(112,855	)



	Three Months Ended September 30, 2017
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Securities		Accumulated Other Comprehensive (Loss) Income
	(In thousands)
Balance as of July 1	$	(136,738	)	$	—	$	(136,738	)
Other comprehensive income	37,225			—		37,225
Balance as of September 30	$	(99,513	)	$	—	$	(99,513	)



	Nine Months Ended September 30, 2018
	Foreign Currency Translation Adjustment			Unrealized Losses On Available-For-Sale Securities			Accumulated Other Comprehensive Loss
	(In thousands)
Balance as of January 1	$	(103,568	)	$	—		$	(103,568	)
Other comprehensive loss before reclassifications	(9,221		)	(14		)	(9,235		)
Amounts reclassified to earnings	(52		)	—			(52		)
Net current period other comprehensive loss	(9,273		)	(14		)	(9,287		)
Balance as of September 30	$	(112,841	)	$	(14	)	$	(112,855	)



	Nine Months Ended September 30, 2017
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Securities			Accumulated Other Comprehensive (Loss) Income
	(In thousands)
Balance as of January 1	$	(170,149	)	$	4,026		$	(166,123	)
Other comprehensive income before reclassifications	69,951			7			69,958
Amounts reclassified to earnings	685			(4,033		)	(3,348		)
Net current period other comprehensive income (loss)	70,636			(4,026		)	66,610
Balance as of September 30	$	(99,513	)	$	—		$	(99,513	)

EARNINGS PER SHARE (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings (Loss) Per Share

The following tables set forth the computation of basic and diluted earnings per share attributable to IAC shareholders:



	Three Months Ended September 30,
	2018						2017
	Basic			Diluted			Basic			Diluted
	(In thousands, except per share data)
Numerator:
Net earnings	$	171,577		$	171,577		$	225,639		$	225,639
Net earnings attributable to noncontrolling interests	(25,803		)	(25,803		)	(45,996		)	(45,996		)
Impact from public subsidiaries' dilutive securities ^(a)	—			(8,336		)	—			(23,749		)
Net earnings attributable to IAC shareholders	$	145,774		$	137,438		$	179,643		$	155,894

Denominator:
Weighted average basic shares outstanding	83,433			83,433			80,817			80,817
Dilutive securities ^{(a) (b) (c) (d)}	—			8,542			—			6,379
Denominator for earnings per share—weighted average shares^{(a) (b) (c) (d)}	83,433			91,975			80,817			87,196

Earnings per share attributable to IAC shareholders:
Earnings per share	$	1.75		$	1.49		$	2.22		$	1.79



	Nine Months Ended September 30,
	2018						2017
	Basic			Diluted			Basic			Diluted
	(In thousands, except per share data)
Numerator:
Net earnings	$	540,270		$	540,270		$	334,659		$	334,659
Net earnings attributable to noncontrolling interests	(105,061		)	(105,061		)	(62,539		)	(62,539		)
Impact from public subsidiaries' dilutive securities ^(a)	—			(19,490		)	—			(34,104		)
Net earnings attributable to IAC shareholders	$	435,209		$	415,719		$	272,120		$	238,016

Denominator:
Weighted average basic shares outstanding	83,342			83,342			79,369			79,369
Dilutive securities ^{(a) (b) (c) (d)}	—			8,076			—			5,133
Denominator for earnings per share—weighted average shares^{(a) (b) (c) (d)}	83,342			91,418			79,369			84,502

Earnings per share attributable to IAC shareholders:
Earnings per share	$	5.22		$	4.55		$	3.43		$	2.82

________________________

^(a)

^(b)

^(c)

^(d)

SEGMENT INFORMATION (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

The following table presents revenue by reportable segment:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
	(In thousands)
Revenue:
Match Group	$	443,943		$	343,418		$	1,272,506		$	951,754
ANGI Homeservices	303,116			181,717			853,249			513,173
Video	64,193			78,338			193,112			184,097
Applications	153,973			136,333			429,034			439,199
Publishing	139,439			88,755			411,116			244,959
Other^(a)	—			—			—			23,980
Inter-segment eliminations	(72		)	(127		)	(228		)	(508		)
Total	$	1,104,592		$	828,434		$	3,158,789		$	2,356,654

___________________


^(a)	The 2017 results at the Other segment consists of the results of The Princeton Review prior to its sale on March 31, 2017.

The following table presents the revenue of the Company's reportable segments disaggregated by type of service:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
	(In thousands)
Match Group
Direct revenue:
North America	$	233,643	$	186,868	$	667,163	$	540,701
International	197,902		143,230		564,846		376,572
Direct revenue	431,545		330,098		1,232,009		917,273
Indirect revenue (principally advertising revenue)	12,398		13,320		40,497		34,481
Total Match Group revenue	$	443,943	$	343,418	$	1,272,506	$	951,754

ANGI Homeservices
Marketplace:
Consumer connection revenue	$	195,065	$	141,055	$	531,297	$	398,218
Membership subscription revenue	17,034		14,486		49,226		40,942
Other revenue	950		1,060		2,869		2,840
Marketplace revenue	213,049		156,601		583,392		442,000
Advertising & Other revenue	73,545		10,503		216,733		28,667
North America	286,594		167,104		800,125		470,667
Consumer connection revenue	12,022		10,001		38,885		29,636
Membership subscription revenue	4,217		4,320		13,405		12,198
Other revenue	283		292		834		672
Europe	16,522		14,613		53,124		42,506
Total ANGI Homeservices revenue	$	303,116	$	181,717	$	853,249	$	513,173

Video
Subscription revenue	$	33,964	$	28,348	$	101,031	$	79,947
Media production and distribution revenue	15,966		45,926		52,281		90,603



Advertising and other revenue	14,263		4,064		39,800		13,547
Total Video revenue	$	64,193	$	78,338	$	193,112	$	184,097

Applications
Desktop
Advertising revenue:
Google advertising revenue	$	110,855	$	112,356	$	326,982	$	364,622
Other	3,410		1,574		7,223		4,795
Advertising revenue	114,265		113,930		334,205		369,417
Subscription and other revenue	4,277		8,692		16,355		25,889
Total Desktop	118,542		122,622		350,560		395,306
Mobile
Subscription and other revenue	31,157		6,216		63,687		23,150
Advertising revenue	4,274		7,495		14,787		20,743
Total Mobile	35,431		13,711		78,474		43,893
Total Applications revenue	$	153,973	$	136,333	$	429,034	$	439,199

Publishing
Premium Brands
Advertising revenue:
Google advertising revenue	$	11,526	$	11,956	$	37,517	$	32,553
Other	26,231		17,909		76,401		51,009
Advertising revenue	37,757		29,865		113,918		83,562
Other revenue	1,340		756		3,746		1,405
Total Premium Brands	39,097		30,621		117,664		84,967
Ask & Other
Advertising revenue:
Google advertising revenue	81,507		51,995		254,762		140,476
Other	12,407		5,928		28,682		18,919
Advertising revenue	93,914		57,923		283,444		159,395
Other revenue	6,428		211		10,008		597
Total Ask & Other	100,342		58,134		293,452		159,992
Total Publishing revenue	$	139,439	$	88,755	$	411,116	$	244,959

The following tables present operating income (loss) and Adjusted EBTIDA by reportable segment:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
	(In thousands)
Operating Income (Loss):
Match Group	$	139,895		$	91,008		$	402,293		$	232,854
ANGI Homeservices	33,515			(112,505		)	46,021			(115,258		)
Video	(10,250		)	(1,809		)	(41,107		)	(25,227		)
Applications	33,041			29,386			91,579			101,288
Publishing	17,398			5,677			46,016			(2,968		)
Other^(a)	—			—			—			(5,621		)
Corporate	(40,767		)	(30,346		)	(113,583		)	(90,962		)
Total	$	172,832		$	(18,589	)	$	431,219		$	94,106



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
	(In thousands)
Adjusted EBITDA:^(b)
Match Group	$	165,039		$	119,564		$	478,341		$	315,705
ANGI Homeservices	$	77,700		$	(2,266	)	$	181,319		$	21,612
Video	$	(7,390	)	$	(822	)	$	(31,432	)	$	(22,386	)
Applications	$	34,989		$	31,077		$	97,145		$	106,556
Publishing	$	18,467		$	7,088		$	49,435		$	11,007
Other^(a)	$	—		$	—		$	—		$	(1,532	)
Corporate	$	(21,478	)	$	(17,070	)	$	(54,038	)	$	(46,908	)

________________________

^(b)

Schedule of Revenue and Long-lived Assets, Excluding Goodwill and Intangible Assets, by Geography

Revenue by geography is based on where the customer is located. Geographic information about revenue and long-lived assets is presented below:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
	(In thousands)
Revenue:
United States	$	738,599	$	577,362	$	2,104,750	$	1,670,980
All other countries	365,993		251,072		1,054,039		685,674
Total	$	1,104,592	$	828,434	$	3,158,789	$	2,356,654



	September 30, 2018		December 31, 2017
	(In thousands)
Long-lived assets (excluding goodwill and intangible assets):
United States	$	279,690	$	286,541
All other countries	28,775		28,629
Total	$	308,465	$	315,170

Schedule of Reconciliation of Operating Income to Adjusted EBITDA

The following tables reconcile operating income (loss) for the Company's reportable segments and net earnings attributable to IAC shareholders to Adjusted EBITDA:



	Three Months Ended September 30, 2018
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	139,895		$	16,141	$	8,513	$	435	$	55	$	165,039
ANGI Homeservices	33,515			$	22,474	$	6,100	$	15,611	$	—	$	77,700
Video	(10,250		)	$	323	$	396	$	2,141	$	—	$	(7,390	)
Applications	33,041			$	—	$	617	$	1,331	$	—	$	34,989
Publishing	17,398			$	—	$	435	$	634	$	—	$	18,467
Corporate	(40,767		)	$	16,425	$	2,864	$	—	$	—	$	(21,478	)
Operating income	172,832
Interest expense	(27,610		)
Other income, net	8,113
Earnings before income taxes	153,335
Income tax benefit	18,242
Net earnings	171,577
Net earnings attributable to noncontrolling interests	(25,803		)
Net earnings attributable to IAC shareholders	$	145,774



	Three Months Ended September 30, 2017
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	91,008		$	19,949	$	8,147	$	401	$	59	$	119,564
ANGI Homeservices	(112,505		)	$	103,980	$	3,491	$	2,768	$	—	$	(2,266	)
Video	(1,809		)	$	134	$	541	$	312	$	—	$	(822	)
Applications	29,386			$	—	$	1,155	$	536	$	—	$	31,077
Publishing	5,677			$	—	$	1,062	$	349	$	—	$	7,088
Corporate	(30,346		)	$	10,409	$	2,867	$	—	$	—	$	(17,070	)
Operating loss	(18,589		)
Interest expense	(25,036		)
Other expense, net	(10,216		)
Loss before income taxes	(53,841		)
Income tax benefit	279,480
Net earnings	225,639
Net earnings attributable to noncontrolling interests	(45,996		)
Net earnings attributable to IAC shareholders	$	179,643



	Nine Months Ended September 30, 2018
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	402,293		$	49,810	$	25,059	$	914	$	265	$	478,341
ANGI Homeservices	46,021			$	69,433	$	18,170	$	47,695	$	—	$	181,319
Video	(41,107		)	$	1,747	$	1,518	$	6,410	$	—	$	(31,432	)
Applications	91,579			$	—	$	2,145	$	3,421	$	—	$	97,145
Publishing	46,016			$	—	$	1,566	$	1,853	$	—	$	49,435
Corporate	(113,583		)	$	51,016	$	8,529	$	—	$	—	$	(54,038	)
Operating income	431,219
Interest expense	(81,471		)
Other income, net	174,635
Earnings before income taxes	524,383
Income tax benefit	15,887
Net earnings	540,270
Net earnings attributable to noncontrolling interests	(105,061		)
Net earnings attributable to IAC shareholders	$	435,209



	Nine Months Ended September 30, 2017
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	232,854		$	53,627	$	23,619	$	1,208	$	4,397	$	315,705
ANGI Homeservices	(115,258		)	$	120,280	$	9,705	$	6,885	$	—	$	21,612
Video	(25,227		)	$	267	$	1,637	$	937	$	—	$	(22,386	)
Applications	101,288			$	—	$	3,087	$	1,633	$	548	$	106,556
Publishing	(2,968		)	$	—	$	4,011	$	9,964	$	—	$	11,007
Other	(5,621		)	$	1,729	$	836	$	1,524	$	—	$	(1,532	)
Corporate	(90,962		)	$	31,459	$	12,595	$	—	$	—	$	(46,908	)
Operating income	94,106
Interest expense	(74,556		)
Other expense, net	(7,700		)
Earnings before income taxes	11,850
Income tax benefit	322,809
Net earnings	334,659
Net earnings attributable to noncontrolling interests	(62,539		)
Net earnings attributable to IAC shareholders	$	272,120

OTHER INCOME (EXPENSE), NET (Tables)

9 Months Ended

Sep. 30, 2018

Other Income and Expenses [Abstract]

Schedule of Other Income (Expense), Net



	Three Months Ended September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
	(In thousands)
Other income (expense), net	$8,113	$(10,216)	$174,635	$(7,700)

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Tables)

9 Months Ended

Sep. 30, 2018

Guarantor and Nonguarantor Financial Statements [Abstract]

Schedule of Condensed Balance Sheet

Balance sheet at September 30, 2018:



	IAC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Cash and cash equivalents	$	739,157	$	—	$	931,827		$	—		$	1,670,984
Marketable securities	173,140		—		35,415			—			208,555
Accounts receivable, net of allowance	—		100,837		246,321			—			347,158
Other current assets	43,501		32,036		170,660			—			246,197
Intercompany receivables	—		1,225,467		—			(1,225,467		)	—
Property and equipment, net of accumulated depreciation and amortization	5,707		166,151		136,607			—			308,465
Goodwill	—		412,009		2,160,212			—			2,572,221
Intangible assets, net of accumulated amortization	—		73,524		550,578			—			624,102
Investment in subsidiaries	1,888,607		198,380		—			(2,086,987		)	—
Other non-current assets	220,674		83,101		223,597			(132,707		)	394,665
Total assets	$	3,070,786	$	2,291,505	$	4,455,217		$	(3,445,161	)	$	6,372,347

Current portion of long-term debt	$	—	$	—	$	13,750		$	—		$	13,750
Accounts payable, trade	884		38,487		36,822			—			76,193
Other current liabilities	39,385		91,104		673,073			—			803,562
Long-term debt, net	34,248		—		1,949,745			—			1,983,993
Income taxes payable	—		1,649		23,592			—			25,241
Intercompany liabilities	395,463		—		830,004			(1,225,467		)	—
Other long-term liabilities	324		18,059		185,810			(132,707		)	71,486
Redeemable noncontrolling interests	—		—		69,530			—			69,530
Shareholders' equity (deficit)	2,600,482		2,142,206		(55,219		)	(2,086,987		)	2,600,482
Noncontrolling interests	—		—		728,110			—			728,110
Total liabilities and shareholders' equity	$	3,070,786	$	2,291,505	$	4,455,217		$	(3,445,161	)	$	6,372,347

Balance sheet at December 31, 2017:



	IAC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			IAC Consolidated
	(In thousands)
Cash and cash equivalents	$	585,639	$	—	$	1,045,170	$	—		$	1,630,809
Marketable securities	4,995		—		—		—			4,995
Accounts receivable, net of allowance	31		109,289		194,707		—			304,027
Other current assets	49,159		33,387		102,828		—			185,374
Intercompany receivables	—		668,703		—		(668,703		)	—
Property and equipment, net of accumulated depreciation and amortization	2,811		174,323		138,036		—			315,170
Goodwill	—		412,010		2,147,056		—			2,559,066
Intangible assets, net of accumulated amortization	—		74,852		588,885		—			663,737
Investment in subsidiaries	2,077,898		554,998		—		(2,632,896		)	—
Other non-current assets	170,073		87,306		79,688		(132,435		)	204,632
Total assets	$	2,890,606	$	2,114,868	$	4,296,370	$	(3,434,034	)	$	5,867,810

Current portion of long-term debt	$	—	$	—	$	13,750	$	—		$	13,750
Accounts payable, trade	5,163		30,469		40,939		—			76,571
Other current liabilities	29,489		88,050		591,868		—			709,407
Long-term debt, net	34,572		—		1,944,897		—			1,979,469
Income taxes payable	16		1,605		24,003		—			25,624
Intercompany liabilities	390,827		—		277,876		(668,703		)	—
Other long-term liabilities	511		18,613		186,610		(132,435		)	73,299
Redeemable noncontrolling interests	—		—		42,867		—			42,867
Shareholders' equity	2,430,028		1,976,131		656,765		(2,632,896		)	2,430,028
Noncontrolling interests	—		—		516,795		—			516,795
Total liabilities and shareholders' equity	$	2,890,606	$	2,114,868	$	4,296,370	$	(3,434,034	)	$	5,867,810

Schedule of Condensed Income Statement

Statement of operations for the three months ended September 30, 2018:



	IAC			Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	212,892	$	891,771		$	(71	)	$	1,104,592
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	19			68,748		168,524			(53		)	237,238
Selling and marketing expense	225			79,865		306,747			(35		)	386,802
General and administrative expense	37,021			7,238		146,627			17			190,903
Product development expense	155			14,395		63,190			—			77,740
Depreciation	271			3,009		15,645			—			18,925
Amortization of intangibles	—			409		19,743			—			20,152
Total operating costs and expenses	37,691			173,664		720,476			(71		)	931,760
Operating (loss) income	(37,691		)	39,228		171,295			—			172,832
Equity in earnings of unconsolidated affiliates	162,497			14,555		—			(177,052		)	—
Interest expense	(424		)	—		(27,186		)	—			(27,610		)
Other (expense) income, net ^(a)	(3,812		)	29,367		3,826			(21,268		)	8,113
Earnings before income taxes	120,570			83,150		147,935			(198,320		)	153,335
Income tax benefit (provision)	25,204			310		(7,272		)	—			18,242
Net earnings	145,774			83,460		140,663			(198,320		)	171,577
Net earnings attributable to noncontrolling interests	—			—		(25,803		)	—			(25,803		)
Net earnings attributable to IAC shareholders	$	145,774		$	83,460	$	114,860		$	(198,320	)	$	145,774
Comprehensive income attributable to IAC shareholders	$	145,245		$	92,277	$	122,765		$	(215,042	)	$	145,245

____________________


^(a)	During the three months ended September 30, 2018, foreign cash of $20 million was repatriated to the U.S.

Statement of operations for the three months ended September 30, 2017:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	185,386		$	643,175		$	(127	)	$	828,434
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	—			41,741			124,676			(127		)	166,290
Selling and marketing expense	311			84,416			268,182			(30		)	352,879
General and administrative expense	32,060			15,404			188,086			30			235,580
Product development expense	592			13,145			56,908			—			70,645
Depreciation	407			4,338			12,518			—			17,263
Amortization of intangibles	—			350			4,016			—			4,366
Total operating costs and expenses	33,370			159,394			654,386			(127		)	847,023
Operating (loss) income	(33,370		)	25,992			(11,211		)	—			(18,589		)
Equity in earnings of unconsolidated affiliates	203,817			489			—			(204,306		)	—
Interest expense	(5,484		)	—			(19,552		)	—			(25,036		)
Other (expense) income, net	(8,157		)	8,309			(10,368		)	—			(10,216		)
Earnings (loss) before income taxes	156,806			34,790			(41,131		)	(204,306		)	(53,841		)
Income tax benefit (provision)	22,837			(11,616		)	268,259			—			279,480
Net earnings	179,643			23,174			227,128			(204,306		)	225,639
Net earnings attributable to noncontrolling interests	—			—			(45,996		)	—			(45,996		)
Net earnings attributable to IAC shareholders	$	179,643		$	23,174		$	181,132		$	(204,306	)	$	179,643
Comprehensive income attributable to IAC shareholders	$	216,868		$	3,682		$	225,089		$	(228,771	)	$	216,868

Statement of operations for the nine months ended September 30, 2018:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	633,745		$	2,525,271		$	(227	)	$	3,158,789
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	170			186,187			471,227			(160		)	657,424
Selling and marketing expense	627			250,305			908,478			(116		)	1,159,294
General and administrative expense	100,082			36,878			426,441			49			563,450
Product development expense	1,371			42,815			185,936			—			230,122
Depreciation	803			9,475			46,709			—			56,987
Amortization of intangibles	—			1,328			58,965			—			60,293
Total operating costs and expenses	103,053			526,988			2,097,756			(227		)	2,727,570
Operating (loss) income	(103,053		)	106,757			427,515			—			431,219
Equity in earnings of unconsolidated affiliates	517,349			19,282			—			(536,631		)	—
Interest expense	(1,276		)	—			(80,195		)	—			(81,471		)
Other (expense) income, net ^(b)	(14,223		)	378,454			159,786			(349,382		)	174,635
Earnings before income taxes	398,797			504,493			507,106			(886,013		)	524,383
Income tax benefit (provision)	36,412			(22,815		)	2,290			—			15,887
Net earnings	435,209			481,678			509,396			(886,013		)	540,270
Net earnings attributable to noncontrolling interests	—			—			(105,061		)	—			(105,061		)
Net earnings attributable to IAC shareholders	$	435,209		$	481,678		$	404,335		$	(886,013	)	$	435,209
Comprehensive income attributable to IAC shareholders	$	425,593		$	490,542		$	401,429		$	(891,971	)	$	425,593

________________________


^(b)	During the nine months ended September 30, 2018, foreign cash of $346 million was repatriated to the U.S.

Statement of operations for the nine months ended September 30, 2017:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	536,789		$	1,820,373		$	(508	)	$	2,356,654
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	160			104,580			346,975			(434		)	451,281
Selling and marketing expense	1,250			258,634			763,640			(130		)	1,023,394
General and administrative expense	93,974			45,779			389,588			56			529,397
Product development expense	2,098			42,324			136,413			—			180,835
Depreciation	1,290			17,355			36,845			—			55,490
Amortization of intangibles	—			10,102			12,049			—			22,151
Total operating costs and expenses	98,772			478,774			1,685,510			(508		)	2,262,548
Operating (loss) income	(98,772		)	58,015			134,863			—			94,106
Equity in earnings of unconsolidated affiliates	346,655			2,512			—			(349,167		)	—
Interest expense	(16,960		)	—			(57,596		)	—			(74,556		)
Other (expense) income, net	(20,783		)	21,207			(8,124		)	—			(7,700		)
Earnings before income taxes	210,140			81,734			69,143			(349,167		)	11,850
Income tax benefit (provision)	61,980			(22,444		)	283,273			—			322,809
Net earnings	272,120			59,290			352,416			(349,167		)	334,659
Net earnings attributable to noncontrolling interests	—			—			(62,539		)	—			(62,539		)
Net earnings attributable to IAC shareholders	$	272,120		$	59,290		$	289,877		$	(349,167	)	$	272,120
Comprehensive income attributable to IAC shareholders	$	338,730		$	46,025		$	373,997		$	(420,022	)	$	338,730

Schedule of Condensed Cash Flow Statement

Statement of cash flows for the nine months ended September 30, 2018:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities	$	(30,873	)	$	502,225		$	548,884		$	(348,536	)	$	671,700
Cash flows from investing activities:
Acquisitions, net of cash acquired	(4,142		)	—			(13,493		)	—			(17,635		)
Capital expenditures	(3,960		)	(1,288		)	(54,865		)	—			(60,113		)
Proceeds from maturities and sales of marketable debt securities	125,000			—			—			—			125,000
Purchases of marketable debt securities	(292,090		)	—			(34,816		)	—			(326,906		)
Purchases of investments	(19,180		)	—			(13,000		)	—			(32,180		)
Net proceeds from the sale of investments and businesses	408			—			28,222			—			28,630
Other, net	(5,000		)	3,908			10,738			—			9,646
Net cash (used in) provided by investing activities	(198,964		)	2,620			(77,214		)	—			(273,558		)
Cash flows from financing activities:
Repurchases of IAC debt	(363		)	—			—			—			(363		)
Principal payments on ANGI Homeservices debt	—			—			(10,313		)	—			(10,313		)
Purchase of IAC treasury stock	(82,891		)	—			—			—			(82,891		)
Purchase of Match Group treasury stock	—			—			(86,239		)	—			(86,239		)
Proceeds from the exercise of IAC stock options	38,903			—			—			—			38,903
Proceeds from the exercise of Match Group and ANGI Homeservices stock options	—			—			2,876			—			2,876
Withholding taxes paid on behalf of IAC employees on net settled stock-based awards	(3,011		)	—			—			—			(3,011		)
Withholding taxes paid on behalf of Match Group and ANGI Homeservices employees on net settled stock-based awards	—			—			(208,962		)	—			(208,962		)
Purchase of noncontrolling interests	—			—			(4,798		)	—			(4,798		)
Acquisition-related contingent consideration payments	—			—			(185		)	—			(185		)
Intercompany	427,698			(504,845		)	(271,389		)	348,536			—
Other, net	2,674			—			(7,547		)	—			(4,873		)
Net cash provided by (used in) financing activities	383,010			(504,845		)	(586,557		)	348,536			(359,856		)
Total cash provided (used)	153,173			—			(114,887		)	—			38,286
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	345			—			(552		)	—			(207		)
Net increase (decrease) in cash, cash equivalents, and restricted cash	153,518			—			(115,439		)	—			38,079
Cash, cash equivalents, and restricted cash at beginning of period	585,639			—			1,048,043			—			1,633,682
Cash, cash equivalents, and restricted cash at end of period	$	739,157		$	—		$	932,604		$	—		$	1,671,761

Statement of cash flows for the nine months ended September 30, 2017:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities	$	(35,286	)	$	75,892		$	257,195		$	—		$	297,801
Cash flows from investing activities:
Acquisitions, net of cash acquired	—			(2,200		)	(66,913		)	—			(69,113		)
Capital expenditures	(337		)	(903		)	(55,279		)	—			(56,519		)
Proceeds from maturities and sales of marketable debt securities	114,350			—			—			—			114,350
Purchases of marketable debt securities	(24,909		)	—			—			—			(24,909		)
Purchases of investments	—			—			(9,105		)	—			(9,105		)
Net proceeds from the sale of businesses and investments	911			—			124,309			—			125,220
Intercompany	(123,893		)	—			—			123,893			—
Other, net	—			307			1,012			—			1,319
Net cash (used in) provided by investing activities	(33,878		)	(2,796		)	(5,976		)	123,893			81,243
Cash flows from financing activities:
Repurchases of IAC debt	(31,590		)	—			—			—			(31,590		)
Proceeds from the issuance of Match Group debt	—			—			75,000			—			75,000
Purchase of IAC treasury stock	(56,424		)	—			—			—			(56,424		)
Proceeds from the exercise of IAC stock options	69,065			—			—			—			69,065
Proceeds from the exercise of Match Group stock options	—			—			57,705			—			57,705
Withholding taxes paid on behalf of IAC employees on net settled stock-based awards	(57,180		)	—			—			—			(57,180		)
Withholding taxes paid on behalf of Match Group employees on net settled stock-based awards	—			—			(228,978		)	—			(228,978		)
Purchase of Match Group stock-based awards	—			—			(272,459		)	—			(272,459		)
Purchase of noncontrolling interests	—			—			(13,011		)	—			(13,011		)
Acquisition-related contingent consideration payments	—			—			(27,289		)	—			(27,289		)
Debt issuance costs	—			—			(2,637		)	—			(2,637		)
Intercompany	73,095			(73,096		)	123,894			(123,893		)	—
Other, net	251			—			(5,253		)	—			(5,002		)
Net cash used in financing activities	(2,783		)	(73,096		)	(293,028		)	(123,893		)	(492,800		)
Total cash used	(71,947		)	—			(41,809		)	—			(113,756		)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	81			—			9,320			—			9,401
Net decrease in cash, cash equivalents, and restricted cash	(71,866		)	—			(32,489		)	—			(104,355		)
Cash, cash equivalents, and restricted cash at beginning of period	573,784			—			786,415			—			1,360,199
Cash, cash equivalents, and restricted cash at end of period	$	501,918		$	—		$	753,926		$	—		$	1,255,844

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenue and Other [Line Items]
Goodwill	$ 2,572,221		$ 2,572,221		$ 2,559,066
Intangible asset	624,102		624,102		663,737
Revenue	1,104,592	$ 828,434	3,158,789	$ 2,356,654
Accounts receivable, net of allowance	$ 347,158		$ 347,158		304,027
Applications
Revenue and Other [Line Items]
Fair Value in excess of carrying amount (as a percent)	5.00%		5.00%
Goodwill	$ 460,100		$ 460,100
Intangible asset	56,600		56,600
Operating segments \| Publishing
Revenue and Other [Line Items]
Revenue	139,439	88,755	411,116	244,959
Operating segments \| Applications
Revenue and Other [Line Items]
Revenue	153,973	136,333	429,034	439,199
Operating segments \| Match Group
Revenue and Other [Line Items]
Revenue	443,943	343,418	1,272,506	951,754
Google Inc.
Revenue and Other [Line Items]
Accounts receivable, net of allowance	73,100		73,100		$ 72,400
Google Inc. \| Publishing and Applications
Revenue and Other [Line Items]
Revenue	$ 204,400	$ 176,800	$ 620,700	$ 539,200
Google Inc. \| Revenue \| Customer concentration risk
Revenue and Other [Line Items]
Concentration risk (as a percent)	19.00%	21.00%	20.00%	23.00%
Google Inc. \| Revenue \| Customer concentration risk \| Operating segments \| Publishing
Revenue and Other [Line Items]
Concentration risk (as a percent)	67.00%	72.00%	71.00%	71.00%
Google Inc. \| Revenue \| Customer concentration risk \| Operating segments \| Applications
Revenue and Other [Line Items]
Concentration risk (as a percent)	72.00%	82.00%	76.00%	83.00%
Match Group
Revenue and Other [Line Items]
Economic interest (as a percent)	80.90%		80.90%
Voting interest (as a percent)	97.50%		97.50%
ANGI Homeservices
Revenue and Other [Line Items]
Economic interest (as a percent)	86.30%		86.30%
Voting interest (as a percent)	98.40%		98.40%

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 1,067,042	$ 1,067,042		$ 595,038
Deferred tax liability	34,861	34,861		35,070
Deferred revenue	381,397	381,397		342,483
Unrealized (losses) gains, net, on equity securities held	$ (115)	126,444
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings			$ 40,200	$ 3,400
Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unrealized (losses) gains, net, on equity securities held		$ 126,400
ANGI Homeservices \| Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings			25,900
Current capitalized contract costs			29,700
Noncurrent capitalized contract costs			4,200
Deferred tax liability			8,000
Applications \| Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings			15,500
Deferred tax liability			4,900
Deferred revenue			$ 20,300

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Adoption of ASU 2014-09 (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 1,104,592	$ 828,434	$ 3,158,789	$ 2,356,654
Operating costs and expenses	931,760	847,023	2,727,570	2,262,548
Operating income (loss)	172,832	(18,589)	431,219	94,106
Net earnings	171,577	225,639	540,270	334,659
Under ASC 605
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	1,104,729		3,159,810
Operating costs and expenses	930,854		2,733,983
Operating income (loss)	173,875		425,827
Net earnings	172,235		536,119
Accounting Standards Update 2014-09 \| Effect of adoption of ASU No. 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	(137)		(1,021)
Operating costs and expenses	906		(6,413)
Operating income (loss)	(1,043)		5,392
Net earnings	(658)		4,151
Operating segments \| Match Group
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	443,943	343,418	1,272,506	951,754
Operating costs and expenses	304,048		870,213
Operating income (loss)	139,895	91,008	402,293	232,854
Operating segments \| Match Group \| Under ASC 605
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	443,943		1,272,506
Operating costs and expenses	304,048		870,213
Operating income (loss)	139,895		402,293
Operating segments \| Match Group \| Accounting Standards Update 2014-09 \| Effect of adoption of ASU No. 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	0		0
Operating costs and expenses	0		0
Operating income (loss)	0		0
Operating segments \| ANGI Homeservices
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	303,116	181,717	853,249	513,173
Operating costs and expenses	269,601		807,228
Operating income (loss)	33,515	(112,505)	46,021	(115,258)
Operating segments \| ANGI Homeservices \| Under ASC 605
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	303,116		853,249
Operating costs and expenses	269,352		815,190
Operating income (loss)	33,764		38,059
Operating segments \| ANGI Homeservices \| Accounting Standards Update 2014-09 \| Effect of adoption of ASU No. 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	0		0
Operating costs and expenses	249		(7,962)
Operating income (loss)	(249)		7,962
Operating segments \| Video
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	64,193	78,338	193,112	184,097
Operating costs and expenses	74,443		234,219
Operating income (loss)	(10,250)	(1,809)	(41,107)	(25,227)
Operating segments \| Video \| Under ASC 605
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	64,440		194,049
Operating costs and expenses	74,756		234,941
Operating income (loss)	(10,316)		(40,892)
Operating segments \| Video \| Accounting Standards Update 2014-09 \| Effect of adoption of ASU No. 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	(247)		(937)
Operating costs and expenses	(313)		(722)
Operating income (loss)	66		(215)
Operating segments \| Applications
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	153,973	136,333	429,034	439,199
Operating costs and expenses	120,932		337,455
Operating income (loss)	33,041	29,386	91,579	101,288
Operating segments \| Applications \| Under ASC 605
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	153,863		429,118
Operating costs and expenses	119,962		335,184
Operating income (loss)	33,901		93,934
Operating segments \| Applications \| Accounting Standards Update 2014-09 \| Effect of adoption of ASU No. 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	110		(84)
Operating costs and expenses	970		2,271
Operating income (loss)	(860)		(2,355)
Operating segments \| Publishing
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	139,439	88,755	411,116	244,959
Operating costs and expenses	122,041		365,100
Operating income (loss)	17,398	5,677	46,016	(2,968)
Operating segments \| Publishing \| Under ASC 605
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	139,439		411,116
Operating costs and expenses	122,041		365,100
Operating income (loss)	17,398		46,016
Operating segments \| Publishing \| Accounting Standards Update 2014-09 \| Effect of adoption of ASU No. 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	0		0
Operating costs and expenses	0		0
Operating income (loss)	0		0
Operating segments \| Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue				23,980
Operating income (loss)				(5,621)
Inter-segment eliminations
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	(72)	(127)	(228)	(508)
Inter-segment eliminations \| Under ASC 605
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	(72)		(228)
Inter-segment eliminations \| Accounting Standards Update 2014-09 \| Effect of adoption of ASU No. 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	0		0
Corporate
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Operating costs and expenses	40,695		113,355
Operating income (loss)	(40,767)	$ (30,346)	(113,583)	$ (90,962)
Corporate \| Under ASC 605
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Operating costs and expenses	40,695		113,355
Operating income (loss)	(40,767)		(113,583)
Corporate \| Accounting Standards Update 2014-09 \| Effect of adoption of ASU No. 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Operating costs and expenses	0		0
Operating income (loss)	$ 0		$ 0

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 1,670,984	$ 1,630,809	$ 1,255,317	$ 1,329,187
Restricted cash included in other current assets	344	2,873	527	20,464
Restricted cash included in other assets	433	0	0	10,548
Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows	$ 1,671,761	$ 1,633,682	$ 1,255,844	$ 1,360,199

REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Deferred revenue			$ 377,200	$ 332,200
Deferred revenue recognized during period	$ 220,400	$ 317,200
Deferred revenue	381,397	381,397			$ 342,483
Noncurrent deferred revenue	1,800	1,800
Amortization expense recognized related to contract cost assets	94,400	254,300
Current contract assets	69,900	69,900
Non-current contract assets	$ 5,600	$ 5,600

INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax benefit (provision)	$ 18,242	$ 279,480	$ 15,887	$ 322,809
Reduction in the Transition Tax	9,200
Unrecognized tax benefits including interest and penalties	43,700		43,700		$ 39,700
Unrecognized tax benefit, if subsequently recognized would reduce income tax expense	40,600		40,600		$ 37,200
Decrease in unrecognized tax benefit, reasonably possible within twelve months	14,600		14,600
Decrease in unrecognized tax benefit, reasonably possible within twelve months which would reduce the income tax provision	14,300		14,300
Decrease in unrecognized tax benefit which would reduce the income tax provision	$ 149,000		$ 149,000

BUSINESS COMBINATION - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
	Sep. 29, 2017	Sep. 30, 2017	Sep. 30, 2017
Business Acquisition [Line Items]
Pro-forma adjustment to increase (decrease) share-based compensation		$ (85.1)	$ (52.8)
Pro-forma adjustment to increase (decrease) transaction related costs		(22.1)	(25.6)
Pro-forma adjustment to increase (decrease) amortization of intangibles		$ 11.4	34.4
Severance and retention costs			$ 12.0
Angie's List
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)	100.00%
Purchase price	$ 781.4

BUSINESS COMBINATION - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Business Combinations [Abstract]
Revenue	$ 898,584	$ 2,571,613
Net earnings attributable to IAC shareholders	$ 244,400	$ 313,054
Basic earnings per share attributable to IAC shareholders (USD per share)	$ 3.02	$ 3.94
Diluted earnings per share attributable to IAC shareholders (USD per share)	$ 2.80	$ 3.70

FINANCIAL INSTRUMENTS - Narrative (Details)	3 Months Ended		9 Months Ended
FINANCIAL INSTRUMENTS - Narrative (Details)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contractual maturity of current available-for-sale securities (equal to or less than)			1 year
Available-for-sale debt securities in an unrealized loss position for longer than twelve months	$ 0		$ 0
Gross realized gains	0	$ 0	0	$ 0
Gross realized losses	0	$ 0	0	$ 0
Contingent Consideration Arrangements
Contingent consideration, maximum amount at balance sheet date	32,000,000		32,000,000
Contingent consideration, fair value at balance sheet date with a maximum limit	2,000,000		2,000,000
Contingent consideration, at fair value, current	2,000,000		2,000,000		$ 600,000
Contingent consideration, at fair value, noncurrent	0		0		2,000,000
Assets measured at fair value on a nonrecurring basis
Equity securities without readily determinable fair values	$ 216,400,000		$ 216,400,000		$ 63,400,000
Measurement Input, Discount Rate \| Contingent Consideration Arrangements
Contingent Consideration Arrangements
Contingent consideration, discount rates (as a percent)	0.12		0.12		0.12

FINANCIAL INSTRUMENTS - Fair Value of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Available-for-sale marketable debt securities	$ 208,005	$ 4,995
Marketable equity security	550	0
Total marketable securities	$ 208,555	$ 4,995

FINANCIAL INSTRUMENTS - Current Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Marketable Securities
Amortized Cost	$ 208,015	$ 4,995
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(10)	0
Fair Value	208,005	4,995
Treasury discount notes
Schedule of Available-for-sale Marketable Securities
Amortized Cost	171,974
Gross Unrealized Gains	0
Gross Unrealized Losses	(10)
Fair Value	171,964
Commercial paper
Schedule of Available-for-sale Marketable Securities
Amortized Cost	36,041	4,995
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 36,041	$ 4,995

FINANCIAL INSTRUMENTS - Proceeds from Maturities and Sales of Current Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Proceeds from maturities and sales of available-for-sale marketable debt securities	$ 115,000	$ 15,000	$ 125,000	$ 114,350

FINANCIAL INSTRUMENTS - Realized and Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Adjustments to Carrying Value of Non-Marketable Equity Securities [Abstract]
Upward adjustments (gross unrealized gains)	$ 0	$ 128,786
Downward adjustments (including impairment) (gross unrealized losses)	0	(2,588)
Total	0	126,198
Adjustments to Carrying Value of Non-Marketable Equity Securities [Abstract]
Realized gains, net, for equity securities sold	702	27,874
Unrealized (losses) gains, net, on equity securities held	(115)	126,444
Total gains recognized, net, in other income, net	$ 587	$ 154,318

FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets:
Marketable securities	$ 208,005	$ 4,995
Marketable equity security	550	0
Total	1,411,286	1,167,397
Liabilities:
Contingent consideration arrangements	(1,980)	(2,647)
Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total	745,596	780,425
Liabilities:
Contingent consideration arrangements	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Total	665,690	386,972
Liabilities:
Contingent consideration arrangements	0	0
Significant Unobservable Inputs (Level 3)
Assets:
Total	0	0
Liabilities:
Contingent consideration arrangements	(1,980)	(2,647)
Money market funds
Assets:
Cash equivalents	745,046	780,425
Money market funds \| Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	745,046	780,425
Money market funds \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	0	0
Money market funds \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0	0
Treasury discount notes
Assets:
Cash equivalents	194,843	100,457
Marketable securities	171,964
Treasury discount notes \| Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	0	0
Marketable securities	0
Treasury discount notes \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	194,843	100,457
Marketable securities	171,964
Treasury discount notes \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0	0
Marketable securities	0
Commercial paper
Assets:
Cash equivalents	157,808	215,325
Marketable securities	36,041	4,995
Commercial paper \| Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	0	0
Marketable securities	0	0
Commercial paper \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	157,808	215,325
Marketable securities	36,041	4,995
Commercial paper \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0	0
Marketable securities	0	0
Time deposits
Assets:
Cash equivalents	105,034	60,000
Time deposits \| Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	0	0
Time deposits \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	105,034	60,000
Time deposits \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0	0
Certificates of deposit
Assets:
Cash equivalents		6,195
Certificates of deposit \| Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents		0
Certificates of deposit \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents		6,195
Certificates of deposit \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents		$ 0
Marketable equity security
Assets:
Marketable equity security	550
Marketable equity security \| Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Marketable equity security	550
Marketable equity security \| Significant Other Observable Inputs (Level 2)
Assets:
Marketable equity security	0
Marketable equity security \| Significant Unobservable Inputs (Level 3)
Assets:
Marketable equity security	$ 0

FINANCIAL INSTRUMENTS - Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Contingent Consideration Arrangements - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Contingent Consideration Arrangements
Balance at beginning of period	$ (1,910)	$ (24,829)	$ (2,647)	$ (33,871)
Fair value adjustments	(55)	(60)	(265)	(4,945)
Included in other comprehensive loss	(15)	(332)	(16)	(1,405)
Settlements	0	23,429	948	38,429
Balance at end of period	$ (1,980)	$ (1,792)	$ (1,980)	$ (1,792)

FINANCIAL INSTRUMENTS - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current portion of long-term debt	$ (13,750)	$ (13,750)
Long-term debt, net of current portion	(1,983,993)	(1,979,469)
Carrying Value
Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current portion of long-term debt	(13,750)	(13,750)
Long-term debt, net of current portion	(1,983,993)	(1,979,469)
Unamortized original issue discount and debt issuance costs	(93,900)	(109,100)
Fair Value
Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current portion of long-term debt	(13,664)	(13,802)
Long-term debt, net of current portion	$ (2,353,160)	$ (2,168,108)

LONG-TERM DEBT - Narrative (Details)		3 Months Ended	9 Months Ended	12 Months Ended
LONG-TERM DEBT - Narrative (Details)	Oct. 02, 2017 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	Dec. 04, 2017 USD ($)	Jun. 01, 2016 USD ($)
Debt Instrument [Line Items]
Exchange price per share (USD per share) \| $ / shares		$ 152.18
IAC Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 300,000,000	$ 300,000,000
Borrowings outstanding of credit facility		0	$ 0	$ 0
Annual commitment fee on undrawn funds, basis points (as a percent)			0.25%
IAC Credit Facility \| Maximum \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum leverage ratio			3.25
Match Group
Debt Instrument [Line Items]
Outstanding balance of debt instrument		1,275,000,000	$ 1,275,000,000	1,275,000,000
Net unamortized discount (premium)		7,681,000	7,681,000	8,668,000
Match Group \| Match Group Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		500,000,000.0	500,000,000.0
Borrowings outstanding of credit facility		0	$ 0	$ 0
Annual commitment fee on undrawn funds, basis points (as a percent)			0.25%
Match Group \| Match Group Credit Agreement \| Maximum \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum leverage ratio			5.0
Match Group \| Match Group Credit Agreement \| Minimum \| Revolving Credit Facility
Debt Instrument [Line Items]
Minimum interest coverage ratio			2.5
Senior Notes \| IAC
Debt Instrument [Line Items]
Outstanding balance of debt instrument	$ 517,500,000.0	$ 460,100,000	$ 460,100,000
Exchangeable stock (shares) \| shares	6.5713
Exchange price per share (USD per share) \| $ / shares	$ 152.18		$ 152.18
Period of reported sale price of common stock (trading days)	20 days
Period of consecutive reported sale price of common stock (trading days)	30 days
Exchange price on applicable trading day (as a percent)	130.00%
Amount of product relative to last reported price (as a percent)	98.00%
Proceeds from issuance of debt	$ 499,500,000
Repayment of net premium on exchangeable note hedge and warrants	50,700,000
Amount of debt discount and increase to additional paid in capital	$ 70,400,000
Outstanding stock (shares) \| shares		3,400,000	3,400,000
Outstanding warrants (shares) \| shares		3,400,000	3,400,000
Exercise price of warrants (USD per share) \| $ / shares		$ 229.70	$ 229.70
If-converted value in excess of principal			$ 219,500,000
Interest expense		$ 5,300,000	15,800,000
Amortization of debt discount (premium)		3,300,000	9,800,000
Amortization of debt issuance costs		900,000	2,600,000
Net unamortized discount (premium)		$ 57,400,000	$ 57,400,000
Senior Notes \| 6.375% Senior Notes \| Maximum
Debt Instrument [Line Items]
Maximum leverage ratio			5.0
Senior Notes \| Exchangeable Senior Notes, 0.875% \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)	0.875%
Senior Notes \| Exchangeable Senior Notes, 0.875% \| Maximum \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)		3.88%	3.88%
Senior Notes \| Exchangeable Senior Notes, 0.875% \| Minimum \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)		0.875%	0.875%
Senior Notes \| Senior Notes, 4.75% \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)		4.75%	4.75%
Senior Notes \| Match Group \| 6.375% Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)		6.375%	6.375%	6.375%		6.375%
Face amount of debt instrument						$ 400,000,000.0
Outstanding balance of debt instrument		$ 400,000,000	$ 400,000,000	$ 400,000,000
Senior Notes \| Match Group \| Match Group Senior Notes, 5.00%
Debt Instrument [Line Items]
Stated interest rate (as a percent)		5.00%	5.00%		5.00%
Outstanding balance of debt instrument		$ 450,000,000	$ 450,000,000	450,000,000	$ 450,000,000
Senior Notes \| Match Group \| 6.75% Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)					6.75%
Outstanding balance of debt instrument					$ 445,200,000
Term Loan \| Match Group \| Term Loan
Debt Instrument [Line Items]
Outstanding balance of debt instrument		425,000,000	$ 425,000,000	$ 425,000,000
Term Loan \| Match Group \| Match Group Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			4.67%	3.85%
Term Loan \| Match Group \| Match Group Term Loan \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			2.50%
Term Loan \| ANGI Homeservices \| Term Loan
Debt Instrument [Line Items]
Outstanding balance of debt instrument		$ 264,688,000	$ 264,688,000	$ 275,000,000
Basis spread on variable rate (as a percent)			4.10%	3.38%
Term Loan \| ANGI Homeservices \| Term Loan \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			1.75%	2.00%
Term Loan \| ANGI Homeservices \| Term Loan \| Maximum
Debt Instrument [Line Items]
Maximum leverage ratio			4.5
Term Loan \| ANGI Homeservices \| Term Loan \| Minimum
Debt Instrument [Line Items]
Minimum interest coverage ratio			2.5
Quarterly Payments for First Three Years \| Term Loan \| ANGI Homeservices \| Term Loan \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			1.25%
Quarterly Payments in Fourth Year \| Term Loan \| ANGI Homeservices \| Term Loan \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			2.50%
Quarterly Payments in Fifth Year \| Term Loan \| ANGI Homeservices \| Term Loan \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			3.75%

LONG-TERM DEBT - Schedule of Long-Term Debt (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017	Dec. 04, 2017	Jun. 01, 2016
Debt Instrument [Line Items]
Less: current portion of long-term debt	$ 13,750,000	$ 13,750,000
Long-term debt, net	1,983,993,000	1,979,469,000
Match Group
Debt Instrument [Line Items]
Long-term debt	1,275,000,000	1,275,000,000
Less: unamortized original issue discount	7,681,000	8,668,000
Less: unamortized debt issuance costs	12,231,000	13,636,000
Long-term debt, net	1,255,088,000	1,252,696,000
Match Group \| Term Loan \| Term Loan
Debt Instrument [Line Items]
Long-term debt	425,000,000	425,000,000
Match Group \| Senior Notes \| 6.375% Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 400,000,000	$ 400,000,000
Stated interest rate (as a percent)	6.375%	6.375%		6.375%
Match Group \| Senior Notes \| Match Group Senior Notes, 5.00%
Debt Instrument [Line Items]
Long-term debt	$ 450,000,000	$ 450,000,000	$ 450,000,000
Stated interest rate (as a percent)	5.00%		5.00%
ANGI Homeservices
Debt Instrument [Line Items]
Less: current portion of long-term debt	$ 13,750,000	13,750,000
Less: unamortized debt issuance costs	2,483,000	2,938,000
Long-term debt, net	248,455,000	258,312,000
ANGI Homeservices \| Term Loan \| Term Loan
Debt Instrument [Line Items]
Long-term debt	264,688,000	275,000,000
IAC/InterActiveCorp
Debt Instrument [Line Items]
Long-term debt	551,989,000	552,359,000
Less: unamortized original issue discount	57,356,000	67,158,000
Less: unamortized debt issuance costs	14,183,000	16,740,000
Long-term debt, net	480,450,000	468,461,000
IAC/InterActiveCorp \| Senior Notes \| Exchangeable Senior Notes, 0.875%
Debt Instrument [Line Items]
Long-term debt	$ 517,500,000	517,500,000
Stated interest rate (as a percent)	0.875%
IAC/InterActiveCorp \| Senior Notes \| Senior Notes, 4.75%
Debt Instrument [Line Items]
Long-term debt	$ 34,489,000	$ 34,859,000
Stated interest rate (as a percent)	4.75%

ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period			$ 2,430,028
Other comprehensive income (loss) before reclassifications	$ (138)	$ 37,225	(9,235)	$ 69,958
Amounts reclassified to earnings			(52)	(3,348)
Net current period other comprehensive income (loss)			(9,287)	66,610
Balance at end of period	2,600,482		2,600,482
Tax provision (benefit) on accumulated other comprehensive income		3,800		3,800
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(112,717)	(136,738)	(103,568)	(166,123)
Balance at end of period	(112,855)	(99,513)	(112,855)	(99,513)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(112,730)	(136,738)	(103,568)	(170,149)
Other comprehensive income (loss) before reclassifications	(111)	37,225	(9,221)	69,951
Amounts reclassified to earnings			(52)	685
Net current period other comprehensive income (loss)			(9,273)	70,636
Balance at end of period	(112,841)	(99,513)	(112,841)	(99,513)
Unrealized Gains (Losses) On Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	13	0	0	4,026
Other comprehensive income (loss) before reclassifications	(27)	0	(14)	7
Amounts reclassified to earnings			0	(4,033)
Net current period other comprehensive income (loss)			(14)	(4,026)
Balance at end of period	$ (14)	$ 0	$ (14)	$ 0

EARNINGS PER SHARE - Summary (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator: Basic
Net earnings	$ 171,577	$ 225,639	$ 540,270	$ 334,659
Net earnings attributable to noncontrolling interests	(25,803)	(45,996)	(105,061)	(62,539)
Net earnings attributable to IAC shareholders	145,774	179,643	435,209	272,120
Numerator: Diluted
Net earnings	171,577	225,639	540,270	334,659
Net earnings attributable to noncontrolling interests	(25,803)	(45,996)	(105,061)	(62,539)
Impact from public subsidiaries' dilutive securities	(8,336)	(23,749)	(19,490)	(34,104)
Net earnings attributable to IAC shareholders	$ 137,438	$ 155,894	$ 415,719	$ 238,016
Denominator: Basic
Weighted average basic shares outstanding (shares)	83,433,000	80,817,000	83,342,000	79,369,000
Denominator: Diluted
Weighted average basic shares outstanding (shares)	83,433,000	80,817,000	83,342,000	79,369,000
Dilutive securities (shares)	8,542,000	6,379,000	8,076,000	5,133,000
Denominator for earnings per share - weighted average shares (shares)	91,975,000	87,196,000	91,418,000	84,502,000
Earnings per share attributable to IAC shareholders: Basic
Basic earnings per share (USD per share)	$ 1.75	$ 2.22	$ 5.22	$ 3.43
Earnings per share attributable to IAC shareholders: Diluted
Diluted earnings per share (USD per share)	1.49	$ 1.79	$ 4.55	$ 2.82
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exchange price per share (USD per share)	$ 152.18
Stock options, warrants, and subsidiary denominated equity exchange of Exchangeable Notes and vesting of RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares)	3,400,000	0	3,400,000	100,000
Market-based awards and PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares)	200,000	300,000	200,000	300,000
Exchangeable Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares)	600,000		200,000

SEGMENT INFORMATION - Financial Data by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 1,104,592	$ 828,434	$ 3,158,789	$ 2,356,654
Operating income (loss)	172,832	(18,589)	431,219	94,106
Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	443,943	343,418	1,272,506	951,754
Operating income (loss)	139,895	91,008	402,293	232,854
Adjusted EBITDA	165,039	119,564	478,341	315,705
Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	303,116	181,717	853,249	513,173
Operating income (loss)	33,515	(112,505)	46,021	(115,258)
Adjusted EBITDA	77,700	(2,266)	181,319	21,612
Operating segments \| Video
Segment Reporting Information [Line Items]
Revenue	64,193	78,338	193,112	184,097
Operating income (loss)	(10,250)	(1,809)	(41,107)	(25,227)
Adjusted EBITDA	(7,390)	(822)	(31,432)	(22,386)
Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	153,973	136,333	429,034	439,199
Operating income (loss)	33,041	29,386	91,579	101,288
Adjusted EBITDA	34,989	31,077	97,145	106,556
Operating segments \| Publishing
Segment Reporting Information [Line Items]
Revenue	139,439	88,755	411,116	244,959
Operating income (loss)	17,398	5,677	46,016	(2,968)
Adjusted EBITDA	18,467	7,088	49,435	11,007
Operating segments \| Other
Segment Reporting Information [Line Items]
Revenue				23,980
Operating income (loss)				(5,621)
Adjusted EBITDA	0	0	0	(1,532)
Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenue	(72)	(127)	(228)	(508)
Corporate
Segment Reporting Information [Line Items]
Operating income (loss)	(40,767)	(30,346)	(113,583)	(90,962)
Adjusted EBITDA	$ (21,478)	$ (17,070)	$ (54,038)	$ (46,908)

SEGMENT INFORMATION - Revenue Disaggregated by Service (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 1,104,592	$ 828,434	$ 3,158,789	$ 2,356,654
Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	443,943	343,418	1,272,506	951,754
Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	303,116	181,717	853,249	513,173
Operating segments \| Video
Segment Reporting Information [Line Items]
Revenue	64,193	78,338	193,112	184,097
Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	153,973	136,333	429,034	439,199
Operating segments \| Publishing
Segment Reporting Information [Line Items]
Revenue	139,439	88,755	411,116	244,959
North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	286,594	167,104	800,125	470,667
International
Segment Reporting Information [Line Items]
Revenue	365,993	251,072	1,054,039	685,674
Europe \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	16,522	14,613	53,124	42,506
Direct revenue \| Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	431,545	330,098	1,232,009	917,273
Direct revenue \| North America \| Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	233,643	186,868	667,163	540,701
Direct revenue \| International \| Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	197,902	143,230	564,846	376,572
Indirect revenue \| Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	12,398	13,320	40,497	34,481
Marketplace revenue \| North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	213,049	156,601	583,392	442,000
Consumer connection revenue \| North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	195,065	141,055	531,297	398,218
Membership subscription revenue \| North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	17,034	14,486	49,226	40,942
Other revenue \| North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	950	1,060	2,869	2,840
Other revenue \| Operating segments \| Video
Segment Reporting Information [Line Items]
Revenue	14,263	4,064	39,800	13,547
Other revenue \| North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	73,545	10,503	216,733	28,667
Consumer connection revenue \| Europe \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	12,022	10,001	38,885	29,636
Membership subscription revenue \| Europe \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	4,217	4,320	13,405	12,198
Other revenue \| Europe \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	283	292	834	672
Subscription revenue \| Operating segments \| Video
Segment Reporting Information [Line Items]
Revenue	33,964	28,348	101,031	79,947
Media production and distribution revenue \| Operating segments \| Video
Segment Reporting Information [Line Items]
Revenue	15,966	45,926	52,281	90,603
Desktop \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	118,542	122,622	350,560	395,306
Advertising revenue \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	114,265	113,930	334,205	369,417
Google advertising revenue \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	110,855	112,356	326,982	364,622
Other \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	3,410	1,574	7,223	4,795
Subscription and other revenue \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	4,277	8,692	16,355	25,889
Mobile \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	35,431	13,711	78,474	43,893
Subscription and other revenue \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	31,157	6,216	63,687	23,150
Advertising revenue \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	4,274	7,495	14,787	20,743
Premium Brands \| Operating segments \| Publishing
Segment Reporting Information [Line Items]
Revenue	39,097	30,621	117,664	84,967
Advertising revenue \| Operating segments \| Publishing
Segment Reporting Information [Line Items]
Revenue	37,757	29,865	113,918	83,562
Google advertising revenue \| Operating segments \| Publishing
Segment Reporting Information [Line Items]
Revenue	11,526	11,956	37,517	32,553
Other \| Operating segments \| Publishing
Segment Reporting Information [Line Items]
Revenue	26,231	17,909	76,401	51,009
Other revenue \| Operating segments \| Publishing
Segment Reporting Information [Line Items]
Revenue	1,340	756	3,746	1,405
Ask & Other \| Operating segments \| Publishing
Segment Reporting Information [Line Items]
Revenue	100,342	58,134	293,452	159,992
Advertising revenue \| Operating segments \| Publishing
Segment Reporting Information [Line Items]
Revenue	93,914	57,923	283,444	159,395
Google advertising revenue \| Operating segments \| Publishing
Segment Reporting Information [Line Items]
Revenue	81,507	51,995	254,762	140,476
Other \| Operating segments \| Publishing
Segment Reporting Information [Line Items]
Revenue	12,407	5,928	28,682	18,919
Other revenue \| Operating segments \| Publishing
Segment Reporting Information [Line Items]
Revenue	$ 6,428	$ 211	$ 10,008	$ 597

SEGMENT INFORMATION - Geographic Information about Revenue and Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenue and long-lived assets by geography
Revenue	$ 1,104,592	$ 828,434	$ 3,158,789	$ 2,356,654
Property and equipment, net of accumulated depreciation and amortization	308,465		308,465		$ 315,170
United States
Revenue and long-lived assets by geography
Revenue	738,599	577,362	2,104,750	1,670,980
Property and equipment, net of accumulated depreciation and amortization	279,690		279,690		286,541
All other countries
Revenue and long-lived assets by geography
Revenue	365,993	$ 251,072	1,054,039	$ 685,674
Property and equipment, net of accumulated depreciation and amortization	$ 28,775		$ 28,775		$ 28,629

SEGMENT INFORMATION - Reconciliation of Operating Income (Loss) to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income (loss)	$ 172,832	$ (18,589)	$ 431,219	$ 94,106
Stock-based compensation expense	55,363	134,472	172,006	207,362
Depreciation	18,925	17,263	56,987	55,490
Amortization of intangibles	20,152	4,366	60,293	22,151
Interest expense	(27,610)	(25,036)	(81,471)	(74,556)
Other income (expense), net	8,113	(10,216)	174,635	(7,700)
Earnings (loss) before income taxes	153,335	(53,841)	524,383	11,850
Income tax benefit (provision)	18,242	279,480	15,887	322,809
Net earnings	171,577	225,639	540,270	334,659
Net earnings attributable to noncontrolling interests	(25,803)	(45,996)	(105,061)	(62,539)
Net earnings attributable to IAC shareholders	145,774	179,643	435,209	272,120
Operating segments \| Match Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income (loss)	139,895	91,008	402,293	232,854
Stock-based compensation expense	16,141	19,949	49,810	53,627
Depreciation	8,513	8,147	25,059	23,619
Amortization of intangibles	435	401	914	1,208
Acquisition-related Contingent Consideration Fair Value Adjustments	55	59	265	4,397
Adjusted EBITDA	165,039	119,564	478,341	315,705
Operating segments \| ANGI Homeservices
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income (loss)	33,515	(112,505)	46,021	(115,258)
Stock-based compensation expense	22,474	103,980	69,433	120,280
Depreciation	6,100	3,491	18,170	9,705
Amortization of intangibles	15,611	2,768	47,695	6,885
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0	0	0
Adjusted EBITDA	77,700	(2,266)	181,319	21,612
Operating segments \| Video
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income (loss)	(10,250)	(1,809)	(41,107)	(25,227)
Stock-based compensation expense	323	134	1,747	267
Depreciation	396	541	1,518	1,637
Amortization of intangibles	2,141	312	6,410	937
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0	0	0
Adjusted EBITDA	(7,390)	(822)	(31,432)	(22,386)
Operating segments \| Applications
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income (loss)	33,041	29,386	91,579	101,288
Stock-based compensation expense	0	0	0	0
Depreciation	617	1,155	2,145	3,087
Amortization of intangibles	1,331	536	3,421	1,633
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0	0	548
Adjusted EBITDA	34,989	31,077	97,145	106,556
Operating segments \| Publishing
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income (loss)	17,398	5,677	46,016	(2,968)
Stock-based compensation expense	0	0	0	0
Depreciation	435	1,062	1,566	4,011
Amortization of intangibles	634	349	1,853	9,964
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0	0	0
Adjusted EBITDA	18,467	7,088	49,435	11,007
Operating segments \| Other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income (loss)				(5,621)
Stock-based compensation expense				1,729
Depreciation				836
Amortization of intangibles				1,524
Acquisition-related Contingent Consideration Fair Value Adjustments				0
Adjusted EBITDA	0	0	0	(1,532)
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income (loss)	(40,767)	(30,346)	(113,583)	(90,962)
Stock-based compensation expense	16,425	10,409	51,016	31,459
Depreciation	2,864	2,867	8,529	12,595
Amortization of intangibles	0	0	0	0
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0	0	0
Adjusted EBITDA	$ (21,478)	$ (17,070)	$ (54,038)	$ (46,908)

OTHER INCOME (EXPENSE), NET - Summary (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Income and Expenses [Abstract]
Other income (expense), net	$ 8,113	$ (10,216)	$ 174,635	$ (7,700)

OTHER INCOME (EXPENSE), NET - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income	$ 8,100	$ 2,900	$ 20,200	$ 7,100
Net foreign currency exchange gains (losses)	800	(10,200)	2,900	(16,300)
Realized gains (losses) on investments	700	4,500	27,900	25,800
Mark-to-market charge on equity investments	800	1,500	1,300	12,200
Net unrealized gains on equity investments	$ (115)		$ 126,444
Other-than-temporary impairment charge		2,900		7,700
Other Nonoperating Income (Expense)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expense related to repricing of debt		$ 2,100		2,100
The Princeton Review \| Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Other Nonoperating Income (Expense)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition of business				$ (1,200)

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Narrative (Details)	Sep. 30, 2018
4.75% Senior Notes due December 15, 2022 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	4.75%

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 1,670,984	$ 1,630,809	$ 1,255,317	$ 1,329,187
Marketable securities	208,555	4,995
Accounts receivable, net of allowance	347,158	304,027
Other current assets	246,197	185,374
Intercompany receivables	0	0
Property and equipment, net of accumulated depreciation and amortization	308,465	315,170
Goodwill	2,572,221	2,559,066
Intangible assets, net of accumulated amortization	624,102	663,737
Investment in subsidiaries	0	0
Other non-current assets	394,665	204,632
TOTAL ASSETS	6,372,347	5,867,810
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	13,750	13,750
Accounts payable, trade	76,193	76,571
Other current liabilities	803,562	709,407
Long-term debt, net	1,983,993	1,979,469
Income taxes payable	25,241	25,624
Intercompany liabilities	0	0
Other long-term liabilities	71,486	73,299
Redeemable noncontrolling interests	69,530	42,867
Shareholders' equity (deficit)	2,600,482	2,430,028
Noncontrolling interests	728,110	516,795
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	6,372,347	5,867,810
Reportable Legal Entities \| IAC
ASSETS
Cash and cash equivalents	739,157	585,639
Marketable securities	173,140	4,995
Accounts receivable, net of allowance	0	31
Other current assets	43,501	49,159
Intercompany receivables	0	0
Property and equipment, net of accumulated depreciation and amortization	5,707	2,811
Goodwill	0	0
Intangible assets, net of accumulated amortization	0	0
Investment in subsidiaries	1,888,607	2,077,898
Other non-current assets	220,674	170,073
TOTAL ASSETS	3,070,786	2,890,606
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	0	0
Accounts payable, trade	884	5,163
Other current liabilities	39,385	29,489
Long-term debt, net	34,248	34,572
Income taxes payable	0	16
Intercompany liabilities	395,463	390,827
Other long-term liabilities	324	511
Redeemable noncontrolling interests	0	0
Shareholders' equity (deficit)	2,600,482	2,430,028
Noncontrolling interests	0	0
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	3,070,786	2,890,606
Reportable Legal Entities \| Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	0	0
Marketable securities	0	0
Accounts receivable, net of allowance	100,837	109,289
Other current assets	32,036	33,387
Intercompany receivables	1,225,467	668,703
Property and equipment, net of accumulated depreciation and amortization	166,151	174,323
Goodwill	412,009	412,010
Intangible assets, net of accumulated amortization	73,524	74,852
Investment in subsidiaries	198,380	554,998
Other non-current assets	83,101	87,306
TOTAL ASSETS	2,291,505	2,114,868
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	0	0
Accounts payable, trade	38,487	30,469
Other current liabilities	91,104	88,050
Long-term debt, net	0	0
Income taxes payable	1,649	1,605
Intercompany liabilities	0	0
Other long-term liabilities	18,059	18,613
Redeemable noncontrolling interests	0	0
Shareholders' equity (deficit)	2,142,206	1,976,131
Noncontrolling interests	0	0
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	2,291,505	2,114,868
Reportable Legal Entities \| Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	931,827	1,045,170
Marketable securities	35,415	0
Accounts receivable, net of allowance	246,321	194,707
Other current assets	170,660	102,828
Intercompany receivables	0	0
Property and equipment, net of accumulated depreciation and amortization	136,607	138,036
Goodwill	2,160,212	2,147,056
Intangible assets, net of accumulated amortization	550,578	588,885
Investment in subsidiaries	0	0
Other non-current assets	223,597	79,688
TOTAL ASSETS	4,455,217	4,296,370
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	13,750	13,750
Accounts payable, trade	36,822	40,939
Other current liabilities	673,073	591,868
Long-term debt, net	1,949,745	1,944,897
Income taxes payable	23,592	24,003
Intercompany liabilities	830,004	277,876
Other long-term liabilities	185,810	186,610
Redeemable noncontrolling interests	69,530	42,867
Shareholders' equity (deficit)	(55,219)	656,765
Noncontrolling interests	728,110	516,795
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	4,455,217	4,296,370
Eliminations
ASSETS
Cash and cash equivalents	0	0
Marketable securities	0	0
Accounts receivable, net of allowance	0	0
Other current assets	0	0
Intercompany receivables	(1,225,467)	(668,703)
Property and equipment, net of accumulated depreciation and amortization	0	0
Goodwill	0	0
Intangible assets, net of accumulated amortization	0	0
Investment in subsidiaries	(2,086,987)	(2,632,896)
Other non-current assets	(132,707)	(132,435)
TOTAL ASSETS	(3,445,161)	(3,434,034)
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	0	0
Accounts payable, trade	0	0
Other current liabilities	0	0
Long-term debt, net	0	0
Income taxes payable	0	0
Intercompany liabilities	(1,225,467)	(668,703)
Other long-term liabilities	(132,707)	(132,435)
Redeemable noncontrolling interests	0	0
Shareholders' equity (deficit)	(2,086,987)	(2,632,896)
Noncontrolling interests	0	0
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ (3,445,161)	$ (3,434,034)

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Guarantor and Nonguarantor Financial Statements [Abstract]
Foreign earnings repatriated	$ 20,000		$ 346,000
Condensed Financial Statements, Captions [Line Items]
Revenue	1,104,592	$ 828,434	3,158,789	$ 2,356,654
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	237,238	166,290	657,424	451,281
Selling and marketing expense	386,802	352,879	1,159,294	1,023,394
General and administrative expense	190,903	235,580	563,450	529,397
Product development expense	77,740	70,645	230,122	180,835
Depreciation	18,925	17,263	56,987	55,490
Amortization of intangibles	20,152	4,366	60,293	22,151
Total operating costs and expenses	931,760	847,023	2,727,570	2,262,548
Operating income (loss)	172,832	(18,589)	431,219	94,106
Equity in earnings of unconsolidated affiliates	0	0	0	0
Interest expense	(27,610)	(25,036)	(81,471)	(74,556)
Other (expense) income, net	8,113	(10,216)	174,635	(7,700)
Earnings (loss) before income taxes	153,335	(53,841)	524,383	11,850
Income tax benefit (provision)	18,242	279,480	15,887	322,809
Net earnings	171,577	225,639	540,270	334,659
Net earnings attributable to noncontrolling interests	(25,803)	(45,996)	(105,061)	(62,539)
Net earnings attributable to IAC shareholders	145,774	179,643	435,209	272,120
Comprehensive income (loss) attributable to IAC shareholders	145,245	216,868	425,593	338,730
Reportable Legal Entities \| IAC
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0	0	0
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	19	0	170	160
Selling and marketing expense	225	311	627	1,250
General and administrative expense	37,021	32,060	100,082	93,974
Product development expense	155	592	1,371	2,098
Depreciation	271	407	803	1,290
Amortization of intangibles	0	0	0	0
Total operating costs and expenses	37,691	33,370	103,053	98,772
Operating income (loss)	(37,691)	(33,370)	(103,053)	(98,772)
Equity in earnings of unconsolidated affiliates	162,497	203,817	517,349	346,655
Interest expense	(424)	(5,484)	(1,276)	(16,960)
Other (expense) income, net	(3,812)	(8,157)	(14,223)	(20,783)
Earnings (loss) before income taxes	120,570	156,806	398,797	210,140
Income tax benefit (provision)	25,204	22,837	36,412	61,980
Net earnings	145,774	179,643	435,209	272,120
Net earnings attributable to noncontrolling interests	0	0	0	0
Net earnings attributable to IAC shareholders	145,774	179,643	435,209	272,120
Comprehensive income (loss) attributable to IAC shareholders	145,245	216,868	425,593	338,730
Reportable Legal Entities \| Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue	212,892	185,386	633,745	536,789
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	68,748	41,741	186,187	104,580
Selling and marketing expense	79,865	84,416	250,305	258,634
General and administrative expense	7,238	15,404	36,878	45,779
Product development expense	14,395	13,145	42,815	42,324
Depreciation	3,009	4,338	9,475	17,355
Amortization of intangibles	409	350	1,328	10,102
Total operating costs and expenses	173,664	159,394	526,988	478,774
Operating income (loss)	39,228	25,992	106,757	58,015
Equity in earnings of unconsolidated affiliates	14,555	489	19,282	2,512
Interest expense	0	0	0	0
Other (expense) income, net	29,367	8,309	378,454	21,207
Earnings (loss) before income taxes	83,150	34,790	504,493	81,734
Income tax benefit (provision)	310	(11,616)	(22,815)	(22,444)
Net earnings	83,460	23,174	481,678	59,290
Net earnings attributable to noncontrolling interests	0	0	0	0
Net earnings attributable to IAC shareholders	83,460	23,174	481,678	59,290
Comprehensive income (loss) attributable to IAC shareholders	92,277	3,682	490,542	46,025
Reportable Legal Entities \| Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue	891,771	643,175	2,525,271	1,820,373
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	168,524	124,676	471,227	346,975
Selling and marketing expense	306,747	268,182	908,478	763,640
General and administrative expense	146,627	188,086	426,441	389,588
Product development expense	63,190	56,908	185,936	136,413
Depreciation	15,645	12,518	46,709	36,845
Amortization of intangibles	19,743	4,016	58,965	12,049
Total operating costs and expenses	720,476	654,386	2,097,756	1,685,510
Operating income (loss)	171,295	(11,211)	427,515	134,863
Equity in earnings of unconsolidated affiliates	0	0	0	0
Interest expense	(27,186)	(19,552)	(80,195)	(57,596)
Other (expense) income, net	3,826	(10,368)	159,786	(8,124)
Earnings (loss) before income taxes	147,935	(41,131)	507,106	69,143
Income tax benefit (provision)	(7,272)	268,259	2,290	283,273
Net earnings	140,663	227,128	509,396	352,416
Net earnings attributable to noncontrolling interests	(25,803)	(45,996)	(105,061)	(62,539)
Net earnings attributable to IAC shareholders	114,860	181,132	404,335	289,877
Comprehensive income (loss) attributable to IAC shareholders	122,765	225,089	401,429	373,997
Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenue	(71)	(127)	(227)	(508)
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	(53)	(127)	(160)	(434)
Selling and marketing expense	(35)	(30)	(116)	(130)
General and administrative expense	17	30	49	56
Product development expense	0	0	0	0
Depreciation	0	0	0	0
Amortization of intangibles	0	0	0	0
Total operating costs and expenses	(71)	(127)	(227)	(508)
Operating income (loss)	0	0	0	0
Equity in earnings of unconsolidated affiliates	(177,052)	(204,306)	(536,631)	(349,167)
Interest expense	0	0	0	0
Other (expense) income, net	(21,268)	0	(349,382)	0
Earnings (loss) before income taxes	(198,320)	(204,306)	(886,013)	(349,167)
Income tax benefit (provision)	0	0	0	0
Net earnings	(198,320)	(204,306)	(886,013)	(349,167)
Net earnings attributable to noncontrolling interests	0	0	0	0
Net earnings attributable to IAC shareholders	(198,320)	(204,306)	(886,013)	(349,167)
Comprehensive income (loss) attributable to IAC shareholders	$ (215,042)	$ (228,771)	$ (891,971)	$ (420,022)

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities			$ 671,700	$ 297,801
Cash flows from investing activities:
Acquisitions, net of cash acquired			(17,635)	(69,113)
Capital expenditures			(60,113)	(56,519)
Proceeds from maturities and sales of marketable debt securities	$ 115,000	$ 15,000	125,000	114,350
Purchases of marketable debt securities			(326,906)	(24,909)
Purchases of investments			(32,180)	(9,105)
Net proceeds from the sale of investments and businesses			28,630	125,220
Intercompany				0
Other, net			9,646	1,319
Net cash (used in) provided by investing activities			(273,558)	81,243
Cash flows from financing activities:
Purchase of noncontrolling interests			(4,798)	(13,011)
Acquisition-related contingent consideration payments			(185)	(27,289)
Debt issuance costs			0	(2,637)
Intercompany			0	0
Other, net			(4,873)	(5,002)
Net cash used in financing activities			(359,856)	(492,800)
Total cash provided (used)			38,286	(113,756)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash			(207)	9,401
Net increase (decrease) in cash, cash equivalents, and restricted cash			38,079	(104,355)
Cash, cash equivalents, and restricted cash at beginning of period			1,633,682	1,360,199
Cash, cash equivalents, and restricted cash at end of period	1,671,761	1,255,844	1,671,761	1,255,844
Reportable Legal Entities \| IAC
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities			(30,873)	(35,286)
Cash flows from investing activities:
Acquisitions, net of cash acquired			(4,142)	0
Capital expenditures			(3,960)	(337)
Proceeds from maturities and sales of marketable debt securities			125,000	114,350
Purchases of marketable debt securities			(292,090)	(24,909)
Purchases of investments			(19,180)	0
Net proceeds from the sale of investments and businesses			408	911
Intercompany				(123,893)
Other, net			(5,000)	0
Net cash (used in) provided by investing activities			(198,964)	(33,878)
Cash flows from financing activities:
Purchase of noncontrolling interests			0	0
Acquisition-related contingent consideration payments			0	0
Debt issuance costs				0
Intercompany			427,698	73,095
Other, net			2,674	251
Net cash used in financing activities			383,010	(2,783)
Total cash provided (used)			153,173	(71,947)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash			345	81
Net increase (decrease) in cash, cash equivalents, and restricted cash			153,518	(71,866)
Cash, cash equivalents, and restricted cash at beginning of period			585,639	573,784
Cash, cash equivalents, and restricted cash at end of period	739,157	501,918	739,157	501,918
Reportable Legal Entities \| Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities			502,225	75,892
Cash flows from investing activities:
Acquisitions, net of cash acquired			0	(2,200)
Capital expenditures			(1,288)	(903)
Proceeds from maturities and sales of marketable debt securities			0	0
Purchases of marketable debt securities			0	0
Purchases of investments			0	0
Net proceeds from the sale of investments and businesses			0	0
Intercompany				0
Other, net			3,908	307
Net cash (used in) provided by investing activities			2,620	(2,796)
Cash flows from financing activities:
Purchase of noncontrolling interests			0	0
Acquisition-related contingent consideration payments			0	0
Debt issuance costs				0
Intercompany			(504,845)	(73,096)
Net cash used in financing activities			(504,845)	(73,096)
Net increase (decrease) in cash, cash equivalents, and restricted cash			0	0
Cash, cash equivalents, and restricted cash at end of period	0	0	0	0
Reportable Legal Entities \| Non-Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities			548,884	257,195
Cash flows from investing activities:
Acquisitions, net of cash acquired			(13,493)	(66,913)
Capital expenditures			(54,865)	(55,279)
Proceeds from maturities and sales of marketable debt securities			0	0
Purchases of marketable debt securities			(34,816)	0
Purchases of investments			(13,000)	(9,105)
Net proceeds from the sale of investments and businesses			28,222	124,309
Intercompany				0
Other, net			10,738	1,012
Net cash (used in) provided by investing activities			(77,214)	(5,976)
Cash flows from financing activities:
Purchase of noncontrolling interests			(4,798)	(13,011)
Acquisition-related contingent consideration payments			(185)	(27,289)
Debt issuance costs				(2,637)
Intercompany			(271,389)	123,894
Other, net			(7,547)	(5,253)
Net cash used in financing activities			(586,557)	(293,028)
Total cash provided (used)			(114,887)	(41,809)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash			(552)	9,320
Net increase (decrease) in cash, cash equivalents, and restricted cash			(115,439)	(32,489)
Cash, cash equivalents, and restricted cash at beginning of period			1,048,043	786,415
Cash, cash equivalents, and restricted cash at end of period	932,604	753,926	932,604	753,926
Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities			(348,536)	0
Cash flows from investing activities:
Acquisitions, net of cash acquired			0	0
Capital expenditures			0	0
Proceeds from maturities and sales of marketable debt securities			0	0
Purchases of marketable debt securities			0	0
Purchases of investments			0	0
Net proceeds from the sale of investments and businesses			0	0
Intercompany				123,893
Other, net			0	0
Net cash (used in) provided by investing activities			0	123,893
Cash flows from financing activities:
Purchase of noncontrolling interests			0	0
Acquisition-related contingent consideration payments			0	0
Debt issuance costs				0
Intercompany			348,536	(123,893)
Net cash used in financing activities			348,536	(123,893)
Net increase (decrease) in cash, cash equivalents, and restricted cash			0	0
Cash, cash equivalents, and restricted cash at end of period	$ 0	$ 0	0	0
IAC/InterActiveCorp
Cash flows from financing activities:
Repurchases of IAC debt			(363)	(31,590)
Purchase of treasury stock			(82,891)	(56,424)
Proceeds from the exercise of stock options			38,903	69,065
Withholding taxes paid on behalf of employees on net settled stock-based awards			(3,011)	(57,180)
IAC/InterActiveCorp \| Reportable Legal Entities \| IAC
Cash flows from financing activities:
Repurchases of IAC debt			(363)	(31,590)
Purchase of treasury stock			(82,891)	(56,424)
Proceeds from the exercise of stock options			38,903	69,065
Withholding taxes paid on behalf of employees on net settled stock-based awards			(3,011)	(57,180)
IAC/InterActiveCorp \| Reportable Legal Entities \| Guarantor Subsidiaries
Cash flows from financing activities:
Repurchases of IAC debt			0	0
Proceeds from the exercise of stock options			0	0
Withholding taxes paid on behalf of employees on net settled stock-based awards			0	0
IAC/InterActiveCorp \| Reportable Legal Entities \| Non-Guarantor Subsidiaries
Cash flows from financing activities:
Repurchases of IAC debt			0	0
Proceeds from the exercise of stock options			0	0
Withholding taxes paid on behalf of employees on net settled stock-based awards			0	0
IAC/InterActiveCorp \| Eliminations
Cash flows from financing activities:
Repurchases of IAC debt			0	0
Proceeds from the exercise of stock options			0	0
Withholding taxes paid on behalf of employees on net settled stock-based awards			0	0
Match Group and ANGI Homeservices
Cash flows from financing activities:
Proceeds from the exercise of stock options			2,876	57,705
Withholding taxes paid on behalf of employees on net settled stock-based awards			(208,962)	(228,978)
Match Group and ANGI Homeservices \| Reportable Legal Entities \| IAC
Cash flows from financing activities:
Proceeds from the exercise of stock options			0
Withholding taxes paid on behalf of employees on net settled stock-based awards			0
Match Group and ANGI Homeservices \| Reportable Legal Entities \| Guarantor Subsidiaries
Cash flows from financing activities:
Proceeds from the exercise of stock options			0
Withholding taxes paid on behalf of employees on net settled stock-based awards			0
Match Group and ANGI Homeservices \| Reportable Legal Entities \| Non-Guarantor Subsidiaries
Cash flows from financing activities:
Proceeds from the exercise of stock options			2,876
Withholding taxes paid on behalf of employees on net settled stock-based awards			(208,962)
Match Group and ANGI Homeservices \| Eliminations
Cash flows from financing activities:
Proceeds from the exercise of stock options			0
Withholding taxes paid on behalf of employees on net settled stock-based awards			0
Match Group
Cash flows from financing activities:
Proceeds from the issuance of Match Group debt			0	75,000
Purchase of treasury stock			(86,239)	0
Proceeds from the exercise of stock options				57,705
Withholding taxes paid on behalf of employees on net settled stock-based awards				(228,978)
Purchase of Match Group stock-based awards			0	(272,459)
Match Group \| Reportable Legal Entities \| IAC
Cash flows from financing activities:
Proceeds from the issuance of Match Group debt				0
Proceeds from the exercise of stock options				0
Withholding taxes paid on behalf of employees on net settled stock-based awards				0
Purchase of Match Group stock-based awards				0
Match Group \| Reportable Legal Entities \| Guarantor Subsidiaries
Cash flows from financing activities:
Proceeds from the issuance of Match Group debt				0
Proceeds from the exercise of stock options				0
Withholding taxes paid on behalf of employees on net settled stock-based awards				0
Purchase of Match Group stock-based awards				0
Match Group \| Reportable Legal Entities \| Non-Guarantor Subsidiaries
Cash flows from financing activities:
Proceeds from the issuance of Match Group debt				75,000
Purchase of treasury stock			(86,239)
Proceeds from the exercise of stock options				57,705
Withholding taxes paid on behalf of employees on net settled stock-based awards				(228,978)
Purchase of Match Group stock-based awards				(272,459)
Match Group \| Eliminations
Cash flows from financing activities:
Proceeds from the issuance of Match Group debt				0
Proceeds from the exercise of stock options				0
Withholding taxes paid on behalf of employees on net settled stock-based awards				0
Purchase of Match Group stock-based awards				0
ANGI Homeservices
Cash flows from financing activities:
Principal payments on ANGI Homeservices debt			(10,313)	$ 0
ANGI Homeservices \| Reportable Legal Entities \| IAC
Cash flows from financing activities:
Principal payments on ANGI Homeservices debt			0
ANGI Homeservices \| Reportable Legal Entities \| Guarantor Subsidiaries
Cash flows from financing activities:
Principal payments on ANGI Homeservices debt			0
ANGI Homeservices \| Reportable Legal Entities \| Non-Guarantor Subsidiaries
Cash flows from financing activities:
Principal payments on ANGI Homeservices debt			(10,313)
ANGI Homeservices \| Eliminations
Cash flows from financing activities:
Principal payments on ANGI Homeservices debt			$ 0

SUBSEQUENT EVENTS - Narrative (Details) $ / shares in Units, shares in Millions						9 Months Ended
	Nov. 06, 2018 USD ($) $ / shares	Nov. 05, 2018 USD ($)	Nov. 02, 2018 USD ($)	Oct. 19, 2018 shares	Oct. 10, 2018 shares	Sep. 30, 2018 USD ($)
IAC Credit Facility \| Revolving Credit Facility
Subsequent Event [Line Items]
Maximum borrowing capacity						$ 300,000,000
Annual commitment fee on undrawn funds, basis points (as a percent)						0.25%
IAC Credit Facility \| Revolving Credit Facility \| Subsequent Event
Subsequent Event [Line Items]
Maximum borrowing capacity		$ 250,000,000
ANGI Homeservices Credit Facility \| Revolving Credit Facility \| Subsequent Event
Subsequent Event [Line Items]
Maximum borrowing capacity		$ 250,000,000
Match Group \| Subsequent Event
Subsequent Event [Line Items]
Dividend declared (USD per share) \| $ / shares	$ 2.00
Aggregate amount of dividend	$ 560,000,000
ANGI Homeservices \| ANGI Homeservices Credit Facility \| Revolving Credit Facility \| Subsequent Event
Subsequent Event [Line Items]
Annual commitment fee on undrawn funds, basis points (as a percent)			0.25%
Maximum \| IAC Credit Facility \| Revolving Credit Facility
Subsequent Event [Line Items]
Maximum leverage ratio						3.25
Maximum \| ANGI Homeservices \| ANGI Homeservices Credit Facility \| Subsequent Event
Subsequent Event [Line Items]
Maximum leverage ratio		4.5
Minimum \| ANGI Homeservices \| ANGI Homeservices Credit Facility \| Subsequent Event
Subsequent Event [Line Items]
Minimum interest coverage ratio		2.0
Handy Technologies, Inc. \| Common Class A \| ANGI Homeservices \| Subsequent Event
Subsequent Event [Line Items]
Stock issued pursuant to business acquisition (shares) \| shares				8.6
Angie's List transaction agreement \| Class B Convertible Common Stock \| ANGI Homeservices \| Subsequent Event
Subsequent Event [Line Items]
Stock issued in transaction (shares) \| shares					5.1
Electus and Dictionary LLC \| Subsequent Event
Subsequent Event [Line Items]
Consideration received from disposition of business			$ 130,000,000
IAC/InterActiveCorp \| Match Group \| Subsequent Event
Subsequent Event [Line Items]
Aggregate amount of dividend	$ 450,000,000
Base Rate \| Quarterly Payments for First Three Years \| ANGI Homeservices \| Term Loan \| Term Loan \| Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		1.25%
Base Rate \| Quarterly Payments in Fourth Year \| ANGI Homeservices \| Term Loan \| Term Loan \| Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		2.50%
Base Rate \| Quarterly Payments in Fifth Year \| ANGI Homeservices \| Term Loan \| Term Loan \| Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		3.75%