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DOCUMENT AND ENTITY INFORMATION - shares	3 Months Ended
DOCUMENT AND ENTITY INFORMATION - shares	Mar. 31, 2019	May 03, 2019
Entity Registrant Name	IAC/INTERACTIVECORP
Entity Central Index Key	0000891103
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Common Class A
Entity Common Stock, Shares Outstanding		78,308,663
Class B Convertible Common Stock
Entity Common Stock, Shares Outstanding		5,789,499

CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 2,217,337	$ 2,131,632
Marketable securities	40,401	123,665
Accounts receivable, net of allowance and reserves of $19,913 and $18,860, respectively	345,686	279,189
Other current assets	226,474	228,253
Total current assets	2,829,898	2,762,739
Right of use assets	172,558	0
Property and equipment, net of accumulated depreciation and amortization of $295,917 and $286,798, respectively	325,888	318,800
Goodwill	2,745,788	2,726,859
Intangible assets, net of accumulated amortization of $155,945 and $136,405, respectively	608,109	631,422
Long-term investments	234,596	235,055
Deferred income taxes	129,304	64,786
Other non-current assets	113,761	134,924
TOTAL ASSETS	7,159,902	6,874,585
LIABILITIES:
Current portion of long-term debt	13,750	13,750
Accounts payable, trade	83,535	74,907
Deferred revenue	386,943	360,015
Accrued expenses and other current liabilities	423,592	434,886
Total current liabilities	907,820	883,558
Long-term debt, net	2,332,234	2,245,548
Income taxes payable	36,176	37,584
Deferred income taxes	22,903	23,600
Other long-term liabilities	217,519	66,807
Redeemable noncontrolling interests	71,914	65,687
Commitments and contingencies
SHAREHOLDERS' EQUITY:
Additional paid-in capital	11,868,424	12,022,387
Retained earnings	1,347,489	1,258,794
Accumulated other comprehensive loss	(126,719)	(128,722)
Treasury stock 194,708 shares, respectively	(10,309,612)	(10,309,612)
Total IAC shareholders' equity	2,779,861	2,843,125
Noncontrolling interests	791,475	708,676
Total shareholders' equity	3,571,336	3,551,801
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	7,159,902	6,874,585
Common stock $.001 par value; authorized 1,600,000 shares; issued 262,629 and 262,303 shares, respectively, and outstanding 78,289 and 77,963 shares, respectively
SHAREHOLDERS' EQUITY:
Common stock	263	262
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 (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Allowance for accounts receivable	$ 19,913	$ 18,860
Accumulated depreciation and amortization of property and equipment	295,917	286,798
Accumulated amortization of intangible assets	$ 155,945	$ 136,405
Treasury stock (shares)	194,708,000	194,708,000
Common stock $.001 par value; authorized 1,600,000 shares; issued 262,629 and 262,303 shares, respectively, and outstanding 78,289 and 77,963 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)	262,629,000	262,303,000
Common stock outstanding (shares)	78,289,000	77,963,000
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 - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue	$ 1,105,843	$ 995,075
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	260,071	201,962
Selling and marketing expense	421,860	402,832
General and administrative expense	213,616	184,184
Product development expense	88,700	76,937
Depreciation	18,971	19,257
Amortization of intangibles	22,752	19,953
Total operating costs and expenses	1,025,970	905,125
Operating income	79,873	89,950
Interest expense	(31,143)	(26,505)
Other income (expense), net	651	(4,619)
Earnings before income taxes	49,381	58,826
Income tax benefit	63,604	29,013
Net earnings	112,985	87,839
Net earnings attributable to noncontrolling interests	(24,290)	(16,757)
Net earnings attributable to IAC shareholders	$ 88,695	$ 71,082
Per share information attributable to IAC shareholders:
Basic earnings per share (USD per share)	$ 1.06	$ 0.86
Diluted earnings per share (USD per share)	$ 0.91	$ 0.71
Stock-based compensation expense by function:
Stock-based compensation expense	$ 67,444	$ 59,082
Cost of revenue
Stock-based compensation expense by function:
Stock-based compensation expense	1,289	710
Selling and marketing expense
Stock-based compensation expense by function:
Stock-based compensation expense	2,717	1,765
General and administrative expense
Stock-based compensation expense by function:
Stock-based compensation expense	45,010	45,626
Product development expense
Stock-based compensation expense by function:
Stock-based compensation expense	$ 18,428	$ 10,981

CONSOLIDATED STATEMENT OF COMPREHENSIVE OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 112,985	$ 87,839
Other comprehensive income, net of tax:
Change in foreign currency translation adjustment	1,309	35,393
Change in unrealized gains and losses of available-for-sale debt securities	1	0
Total other comprehensive income	1,310	35,393
Comprehensive income, net of tax	114,295	123,232
Components of comprehensive income attributable to noncontrolling interests:
Net earnings attributable to noncontrolling interests	(24,290)	(16,757)
Change in foreign currency translation adjustment attributable to noncontrolling interests	(316)	(7,036)
Change in unrealized gains and losses of available-for-sale debt securities attributable to noncontrolling interests	1	0
Comprehensive income attributable to noncontrolling interests	(24,605)	(23,793)
Comprehensive income attributable to IAC shareholders	$ 89,690	$ 99,439

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
Balance at beginning of period at Dec. 31, 2017		$ 42,867
Increase (Decrease) in Redeemable Noncontrolling Interests
Net (loss) earnings		(959)
Other comprehensive loss, net of tax		579
Stock-based compensation expense		410
Purchase of noncontrolling interests		0
Adjustment of redeemable noncontrolling interests to fair value		3,403
Noncontrolling interests created in acquisitions	$ 0	787								$ 0
Other		12
Balance at end of period at Mar. 31, 2018		47,099
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 (loss) earnings	88,798		71,082				71,082			17,716
Other comprehensive loss, net of tax	34,814		28,357					28,357		6,457
Stock-based compensation expense	58,672		17,214			17,214				41,458
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	25,275		25,275			25,275
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares)				772,000
Purchase of noncontrolling interests	(269)									(269)
Adjustment of redeemable noncontrolling interests to fair value	(3,403)		(3,403)			(3,403)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests											$ (110,043)	$ (111,457)	$ (111,721)	$ 264	$ 1,414	$ (1,143)	$ (1,941)	$ (1,938)	$ (3)	$ 798
Noncontrolling interests created in acquisitions	0	787								0
Other	2,662		2,577			2,577				85
Balance at end of period at Mar. 31, 2018	3,082,391		2,494,527	$ 261	$ 16	12,093,006	702,915	(74,950)	(10,226,721)	587,864
Balance at end of period (shares) at Mar. 31, 2018				261,396,000	16,157,000
Balance at beginning of period at Dec. 31, 2018	65,687	65,687
Increase (Decrease) in Redeemable Noncontrolling Interests
Net (loss) earnings		(1,051)
Other comprehensive loss, net of tax		186
Stock-based compensation expense		42
Purchase of noncontrolling interests		(3,182)
Adjustment of redeemable noncontrolling interests to fair value		10,242
Other		(10)
Balance at end of period at Mar. 31, 2019	71,914	$ 71,914
Balance at beginning of period at Dec. 31, 2018	3,551,801		2,843,125	$ 262	$ 16	12,022,387	1,258,794	(128,722)	(10,309,612)	708,676
Balance at beginning of period (shares) at Dec. 31, 2018				262,303,000	16,157,000
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings	114,036		88,695				88,695			25,341
Other comprehensive loss, net of tax	1,124		995					995		129
Stock-based compensation expense	67,402		20,165			20,165				47,237
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	(4,910)		(4,910)	$ 1		(4,911)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares)				326,000
Purchase of noncontrolling interests	0									0
Adjustment of redeemable noncontrolling interests to fair value	(10,242)		(10,242)			(10,242)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests											$ (131,876)	$ (132,860)	$ (133,861)	$ 1,001	$ 984	$ (15,982)	$ (25,090)	$ (25,097)	$ 7	$ 9,108
Other	(17)		(17)			(17)				0
Balance at end of period at Mar. 31, 2019	$ 3,571,336		$ 2,779,861	$ 263	$ 16	$ 11,868,424	$ 1,347,489	$ (126,719)	$ (10,309,612)	$ 791,475
Balance at end of period (shares) at Mar. 31, 2019				262,629,000	16,157,000

CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Parenthetical)	Mar. 31, 2019 $ / 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 - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net earnings	$ 112,985	$ 87,839
Adjustments to reconcile net earnings to net cash provided by operating activities:
Stock-based compensation expense	67,444	59,082
Amortization of intangibles	22,752	19,953
Depreciation	18,971	19,257
Bad debt expense	15,005	9,528
Deferred income taxes	(65,107)	(31,895)
Other adjustments, net	18,741	13,726
Changes in assets and liabilities, net of effects of acquisitions and dispositions:
Accounts receivable	(88,367)	(29,901)
Other assets	6,730	(22,680)
Accounts payable and other liabilities	(26,829)	(7,592)
Income taxes payable and receivable	(6,154)	(7,034)
Deferred revenue	26,770	41,725
Net cash provided by operating activities	102,941	152,008
Cash flows from investing activities:
Acquisitions, net of cash acquired	(21,555)	(21,295)
Capital expenditures	(25,855)	(14,801)
Proceeds from maturities of marketable debt securities	123,500	5,000
Purchases of marketable debt securities	(39,740)	(4,975)
Net proceeds from the sale of businesses and investments	20,472	15
Purchases of investments	0	(18,180)
Other, net	(1,215)	9,347
Net cash provided by (used in) investing activities	55,607	(44,889)
Cash flows from financing activities:
Debt issuance costs	(5,542)	(193)
Purchase of noncontrolling interests	(3,182)	(234)
Acquisition-related contingent consideration payments	0	(185)
Other, net	27	2,669
Net cash used in financing activities	(73,660)	(83,150)
Total cash provided	84,888	23,969
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	815	2,746
Net increase in cash, cash equivalents, and restricted cash	85,703	26,715
Cash, cash equivalents, and restricted cash at beginning of period	2,133,685	1,633,682
Cash, cash equivalents, and restricted cash at end of period	2,219,388	1,660,397
Match Group and ANGI Homeservices
Cash flows from financing activities:
Proceeds from the exercise of stock options	573	1,752
Withholding taxes paid on behalf of employees on net settled stock-based awards	(123,148)	(75,028)
ANGI Homeservices
Cash flows from financing activities:
Principal payments on debt	(3,438)	(3,438)
Debt issuance costs		(193)
Match Group
Cash flows from financing activities:
Borrowings under Match Group Credit Facility	40,000	0
Proceeds from Match Group 2019 Senior Notes offering	350,000	0
Principal payments on debt	(300,000)	0
Purchase of Match Group treasury stock	(24,186)	(32,465)
IAC/InterActiveCorp
Cash flows from financing activities:
Proceeds from the exercise of stock options	9,298	24,254
Withholding taxes paid on behalf of employees on net settled stock-based awards	$ (14,062)	$ (282)

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

3 Months Ended

Mar. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of Operations

IAC has majority ownership of both Match Group, which includes Tinder, Match, PlentyOfFish and OkCupid, and ANGI Homeservices, which includes HomeAdvisor, Angie’s List and Handy, and also operates Vimeo and Dotdash, among many other online businesses.

As used herein, "IAC," the "Company," "we," "our" or "us" and similar terms refer to IAC/InterActiveCorp and its subsidiaries (unless the context requires otherwise).

As of March 31, 2019, IAC’s economic and voting interest in:


•	Match Group were 80.4%, and 97.5%, respectively. All references to "Match Group" or "MTCH" in this report are to Match Group, Inc.


•	ANGI Homeservices were 83.3%, and 98.0%, respectively. All reference to "ANGI Homeservices" or "ANGI" in this report are to ANGI Homeservices Inc.

Basis of Presentation and Consolidation

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.

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, 2018.

Accounting for Investments and Equity Securities

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 the Financial Accounting Standards Board's ("FASB") issued Accounting Standards Update ("ASU") No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, following its adoption on January 1, 2018, with any changes to fair value 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 identical or similar investments of the same issuer; 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 its equity securities for impairment each reporting period when there are qualitative factors or events that indicate possible impairment. Factors we consider in making this determination include negative changes in industry and market conditions, financial performance, business prospects, and other relevant events and factors. When indicators of impairment exist, the Company prepares quantitative assessments of the fair value of our equity securities, which require judgment and the use of estimates. When our assessment indicates that the fair value of the security is below the carrying value, the Company writes down the security to its fair value and records the corresponding charge within other income (expense), net.

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. At March 31, 2019 and December 31, 2018, the Company did not have any investments accounted for using the equity method.

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: contingencies; 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 cash equivalents and marketable debt securities; 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").

For the three months ended March 31, 2019 and 2018, consolidated revenue earned from Google was $195.8 million and $211.3 million, representing 18% and 21%, respectively, of the Company's consolidated revenue. A meaningful portion of this revenue is attributable to the services agreement with Google and earned by the Desktop business within the Applications segment and the Ask Media Group within the Emerging & Other segment. For the three months ended March 31, 2019 and 2018, revenue from Google of $88.1 million and $108.6 million was earned within the Applications segment and $96.3 million and $92.8 million within the Emerging & Other segment, respectively. Accounts receivable related to revenue earned from Google totaled $71.6 million and $69.1 million at March 31, 2019 and December 31, 2018, respectively.

The services agreement became effective on April 1, 2016, following the expiration of the previous services agreement, and expires on March 31, 2020. 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. On February 11, 2019, the Company and Google amended the services agreement, effective as of April 1, 2020. The amendment extends the expiration date of the agreement to March 31, 2023; provided, that beginning September 2020 and each September thereafter, either party may, after discussion with the other party, terminate the services agreement, effective on September 30 of the year following the year such notice is given. The Company believes that the amended agreement, taken as a whole, is comparable to the Company’s previously existing agreement with Google.

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

The Company adopted ASU No. 2016-02, Leases (Topic 842) ("ASC 842") effective January 1, 2019. ASC 842 superseded previously existing guidance on accounting for leases and generally requires all leases to be recognized in the statement of financial position.

The adoption of ASC 842 resulted in the recognition of $154.7 million of right of use assets ("ROU assets") and related lease liabilities as of January 1, 2019, with no cumulative effect adjustment. The adoption of ASC 842 had no impact on the Company’s

consolidated statement of operations and consolidated statement of cash flows. In addition, the adoption of ASC 842 did not impact the leverage calculations set forth in the agreements governing the outstanding debt or credit agreements of the Company or its subsidiaries, because, in each circumstance, the leverage calculations are not affected by the lease liabilities that were recorded upon adoption of ASC 842.

The Company adopted ASC 842 prospectively and, therefore, did not revise comparative period information or disclosure. In addition, the Company elected the package of practical expedients permitted under ASC 842.

See "Note 3—Leases" for additional information on the adoption of ASC 842.

Reclassifications

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

REVENUE RECOGNITION	3 Months Ended
REVENUE RECOGNITION	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
REVENUE RECOGNITION	REVENUE RECOGNITION General Revenue Recognition 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 expects to be entitled to in exchange for those services or goods. The Company's disaggregated revenue disclosures are presented in "Note 9—Segment Information." Deferred Revenue Deferred revenue consists of advance payments that are received or are contractually 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 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 current and non-current deferred revenue balances at December 31, 2018 are $360.0 million and $1.7 million, respectively. During the three months ended March 31, 2019, the Company recognized $234.8 million of revenue that was included in the deferred revenue balance as of December 31, 2018. The current and non-current deferred revenue balances at March 31, 2019 are $386.9 million and $1.5 million, respectively. Non-current deferred revenue is included in “Other long-term liabilities” in the accompanying consolidated balance sheet. Practical Expedients and Exemptions As permitted under the practical expedient available under ASU No. 2014-09, Revenue from Contracts with Customers, 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. 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 amount of capitalized sales commissions where the customer relationship period is greater than one year is $42.3 million and $40.5 million at March 31, 2019 and December 31, 2018, respectively.

LEASES

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

LEASES

The Company leases land, office space, data center facilities and equipment used in connection with its operations under various operating leases, the majority of which contain escalation clauses. The Company does not have any financing leases.

ROU assets represent the Company’s right to use the underlying assets for the lease term and lease liabilities represent the present value of the Company’s obligation to make payments arising from leases. ROU assets and related lease liabilities are based on the present value of fixed lease payments over the lease term using the Company's and its publicly traded subsidiaries'

respective incremental borrowing rates on the lease commencement date or January 1, 2019 for leases that commenced prior to that date. The Company combines the lease and non-lease components of lease payments in determining ROU assets and related lease liabilities. If the lease includes one or more options to extend the term of the lease, the renewal option is considered in the lease term if it is reasonably certain the Company will exercise the option. Leases with an initial term of twelve months or less ("short-term leases") are not recorded on the accompanying consolidated balance sheet. Lease expense is recognized on a straight-line basis over the term of the lease.

Variable lease payments consist primarily of common area maintenance, utilities and taxes, which are not included in the recognition of ROU assets and related lease liabilities. The Company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants.



Leases	Balance Sheet Classification	March 31, 2019
		(In thousands)
Assets:
Right of use assets	Right of use assets	$	172,558

Liabilities:
Current lease liabilities	Accrued expenses and other current liabilities	31,215
Long-term lease liabilities	Other long-term liabilities	185,752
Total lease liabilities		$	216,967



Lease Cost	Income Statement Classification	Three Months Ended March 31, 2019
		(In thousands)
Fixed lease cost	Cost of revenue	$	1,075
Fixed lease cost	Selling and marketing expense	1,909
Fixed lease cost	General and administrative expense	7,190
Fixed lease cost	Product development expense	318
Total fixed lease cost ^(a)		10,492
Variable lease cost	Cost of revenue	157
Variable lease cost	Selling and marketing expense	304
Variable lease cost	General and administrative expense	1,804
Variable lease cost	Product development expense	54
Total variable lease cost		2,319
Net lease cost		$	12,811

_____________________

^(a)Includes approximately $1.3 million of short-term lease cost and $0.5 million of sublease income.

Maturities of lease liabilities^(b):



	March 31, 2019
	(In thousands)
2019	30,727
2020	41,238
2021	35,037
2022	28,211
2023	25,022
After 2023	230,683
Total	390,918
Less: Interest	173,951
Present value of lease liabilities	$	216,967

_____________________


^(b)	Lease payments exclude $54.5 million of legally binding minimum lease payments for leases signed but not yet commenced.

The following are the weighted average assumptions used for lease term and discount rate:



	March 31, 2019
Remaining lease term	15.8 years
Discount rate	5.99	%



	Three Months Ended March 31, 2019
	(In thousands)
Other Information:
Right of use assets obtained in exchange for lease liabilities	$	28,270
Cash paid for amounts included in the measurement of lease liabilities	$	13,175

INCOME TAXES	3 Months Ended
INCOME TAXES	Mar. 31, 2019
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 months ended March 31, 2019 and 2018, the Company recorded an income tax benefit, despite pre-tax income, of $63.6 million and $29.0 million, respectively, due primarily to excess tax benefits generated by the exercise and vesting of stock-based awards. 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 Internal Revenue Service 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 2015 has been extended to December 31, 2019. Returns filed in 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 adjustment. 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 March 31, 2019 and December 31, 2018, unrecognized tax benefits, including interest and penalties, are $51.3 million and $52.3 million, respectively. If unrecognized tax benefits at March 31, 2019 are subsequently recognized, $48.0 million, net of related deferred tax assets and interest, would reduce income tax expense. The comparable amount as of December 31, 2018 was $49.1 million. The Company believes that it is reasonably possible that its unrecognized tax benefits could decrease by $24.0 million by March 31, 2019, due to expirations of statutes of limitations or other settlements; $23.5 million of which would reduce the income tax provision.

FINANCIAL INSTRUMENTS

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

FINANCIAL INSTRUMENTS

Marketable Securities

At March 31, 2019 and December 31, 2018, the fair value of marketable securities are as follows:



	March 31, 2019		December 31, 2018
	(In thousands)
Available-for-sale marketable debt securities	$	39,954	$	123,246
Marketable equity security	447		419
Total marketable securities	$	40,401	$	123,665

At March 31, 2019, 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	$	24,983	$	—	$	—	$	24,983
Commercial paper	14,971		—		—		14,971
Total available-for-sale marketable debt securities	$	39,954	$	—	$	—	$	39,954

The contractual maturities of debt securities classified as current available-for-sale at March 31, 2019 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 March 31, 2019.

At December 31, 2018, current available-for-sale marketable debt securities were as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Treasury discount notes	$	112,291	$	3	$	(3	)	$	112,291
Commercial paper	10,955		—		—			10,955
Total available-for-sale marketable debt securities	$	123,246	$	3	$	(3	)	$	123,246

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



	Three Months Ended March 31,
	2019		2018
	(In thousands)
Proceeds from maturities of available-for-sale marketable debt securities	$	123,500	$	5,000

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 of available-for-sale marketable debt securities for the three months ended March 31, 2019 and 2018.

Equity securities without readily determinable fair values

At March 31, 2019 and December 31, 2018, the carrying values of the Company's investments in equity securities without readily determinable fair values totaled $234.6 million and $235.1 million, respectively, and are included in "Long-term investments" in the accompanying consolidated balance sheet. 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 March 31, 2019 and 2018.



	Three Months Ended March 31,
	2019			2018
	(In thousands)
Upward adjustments (gross unrealized gains)	$	—		$	—
Downward adjustments including impairment (gross unrealized losses)	(150		)	(192		)
Total	$	(150	)	$	(192	)

The cumulative upward and downward adjustments (including impairments) to the carrying value of equity securities without readily determinable fair values since the adoption of ASU 2016-01, on January 1, 2018, through March 31, 2019 were $129.0 million and $(2.6) million, respectively.

Realized and unrealized gains and losses for the Company's marketable equity security and investments without readily determinable fair values for the three months ended March 31, 2019 and 2018 are as follows:



	Three Months Ended March 31,
	2019			2018
	(In thousands)
Realized gains (losses), net, for equity securities sold	$	78		$	(103	)
Unrealized (losses) gains, net, on equity securities held	(122		)	145
Total (losses) gains recognized, net, in other income (expense), net	$	(44	)	$	42

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.

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



	March 31, 2019
	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	$	733,882	$	—	$	—		$	733,882
Treasury discount notes	—		771,604		—			771,604
Commercial paper	—		118,740		—			118,740
Time deposits	—		110,036		—			110,036
Marketable securities:
Treasury discount notes	—		24,983		—			24,983
Commercial paper	—		14,971		—			14,971
Marketable equity security	447		—		—			447
Total	$	734,329	$	1,040,334	$	—		$	1,774,663

Liabilities:
Contingent consideration arrangement	$	—	$	—	$	(28,186	)	$	(28,186	)



	December 31, 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	$	880,815	$	—	$	—		$	880,815
Treasury discount notes	—		561,733		—			561,733
Commercial paper	—		162,417		—			162,417
Time deposits	—		90,036		—			90,036
Marketable securities:
Treasury discount notes	—		112,291		—			112,291
Commercial paper	—		10,955		—			10,955
Marketable equity security	419		—		—			419
Total	$	881,234	$	937,432	$	—		$	1,818,666

Liabilities:
Contingent consideration arrangements	$	—	$	—	$	(28,631	)	$	(28,631	)

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 March 31,
	2019			2018
	(In thousands)
Balance at January 1	$	(28,631	)	$	(2,647	)
Total net losses:
Included in earnings:
Fair value adjustments	(1,529		)	(156		)
Included in other comprehensive loss	(14		)	(110		)
Settlements	1,988			948
Balance at March 31	$	(28,186	)	$	(1,965	)

Contingent Consideration Arrangements

At March 31, 2019, the Company has one contingent consideration arrangement outstanding related to a business acquisition. The arrangement has a total maximum contingent payment of $45.0 million. At March 31, 2019, the gross fair value of this arrangement, before unamortized discount, is $44.0 million. During the first quarter of 2019, the Company paid $2.0 million to settle a contingent consideration arrangement that was outstanding at December 31, 2018.

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 arrangement at March 31, 2019 reflect a

discount rate of 25%. The fair value of the contingent consideration arrangements at December 31, 2018 reflect discount rates ranging from 12% to 25%.

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 March 31, 2019 and December 31, 2018 includes a non-current portion of $28.2 million and $26.6 million, respectively, and at December 31, 2018 a current portion of $2.0 million. At March 31, 2019, there is no current portion of the contingent consideration arrangement liability. Current and non-current portions of the contingent consideration liability are included in “Accrued expenses and other current liabilities” and “Other long-term liabilities,” respectively, in the accompanying consolidated balance sheet.

Assets measured at fair value on a nonrecurring basis

The Company's non-financial assets, such as goodwill, intangible assets and property and equipment are adjusted to fair value only when an impairment 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 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:



	March 31, 2019						December 31, 2018
	Carrying Value			Fair Value			Carrying Value			Fair Value
	(In thousands)
Current portion of long-term debt	$	(13,750	)	$	(13,243	)	$	(13,750	)	$	(12,753	)
Long-term debt, net^(a)	(2,332,234		)	(2,683,980		)	(2,245,548		)	(2,460,204		)

_____________________


^(a)	At March 31, 2019 and December 31, 2018, the carrying value of long-term debt, net includes unamortized original issue discount and debt issuance costs of $88.8 million and $88.9 million, respectively.

At March 31, 2019 and December 31, 2018, 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. At December 31, 2018, the Company considered the outstanding borrowings under the MTCH Credit Facility, which has a variable interest rate, to have a fair value equal to its carrying value. The outstanding borrowings under the MTCH Credit Facility were repaid with a portion of the net proceeds from the 5.625% MTCH Senior Notes issued on February 15, 2019. See "Note 6—Long-term Debt" for additional information on the repayment of the MTCH Credit Facility.

- 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

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

LONG-TERM DEBT

Long-term debt consists of:



	March 31, 2019		December 31, 2018
	(In thousands)
MTCH Debt:
MTCH Term Loan due November 16, 2022	$	425,000	$	425,000
MTCH Credit Facility due December 7, 2023	—		260,000
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
5.625% Senior Notes due February 15, 2029 (the "5.625% MTCH Senior Notes"); interest payable each February 15 and August 15, commencing on August 15, 2019	350,000		—
Total MTCH long-term debt	1,625,000		1,535,000
Less: unamortized original issue discount	7,023		7,352
Less: unamortized debt issuance costs	16,321		11,737
Total MTCH debt, net	1,601,656		1,515,911

ANGI Debt:
ANGI Term Loan due November 5, 2023	257,813		261,250
Less: current portion of ANGI Term Loan	13,750		13,750
Less: unamortized debt issuance costs	2,399		2,529
Total ANGI debt, net	241,664		244,971

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		34,489
Total IAC long-term debt	551,989		551,989
Less: unamortized original issue discount	50,661		54,025
Less: unamortized debt issuance costs	12,414		13,298
Total IAC debt, net	488,914		484,666

Total long-term debt, net	$	2,332,234	$	2,245,548

MTCH Senior Notes

The 6.375% MTCH Senior Notes were issued on June 1, 2016. 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. 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.

On February 15, 2019, MTCH issued $350 million aggregate principal amount of its 5.625% Senior Notes. The proceeds were used to repay outstanding borrowings under the MTCH Credit Facility, to pay expenses associated with the offering, and for general corporate purposes. At any time prior to February 15, 2024, 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.

The indentures governing the 6.375% and 5.00% MTCH Senior Notes contain covenants that would limit MTCH's ability to pay dividends, make distributions or repurchase MTCH stock in the event a default has occurred or MTCH's consolidated leverage ratio (as defined in the indentures) exceeds 5.0 to 1.0. At March 31, 2019, there were no limitations pursuant thereto. There are additional covenants in those indentures 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. The indenture governing the 5.625% MTCH Senior Notes is less restrictive than the indentures governing the 6.375% and 5.00% MTCH Senior Notes and generally only limits MTCH's ability and the ability of its subsidiaries to, among other things, create liens on assets and limits MTCH's ability to consolidate, merge, sell or otherwise dispose of all or substantially all of its assets.

All of MTCH's Senior Notes are ranked equally with each other.

MTCH Term Loan and MTCH Credit Facility

At both March 31, 2019 and December 31, 2018, the outstanding balance on the MTCH Term Loan was $425 million. The MTCH Term Loan bears interest at LIBOR plus 2.50%, and was 5.08% and 5.09% at March 31, 2019 and December 31, 2018, 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 March 31, 2019, MTCH has a $500 million revolving credit facility (the "MTCH Credit Facility") that expires on December 7, 2023. At March 31, 2019, there were no outstanding borrowings under the MTCH Credit Facility. At December 31, 2018, the outstanding borrowings under the MTCH Credit Facility were $260.0 million, which bore interest at LIBOR plus 1.50%, or approximately 4.00%, and were repaid with a portion of the net proceeds from the 5.625% MTCH Senior Notes, described above. The annual commitment fee on undrawn funds based on the current consolidated net leverage ratio is 25 basis points at both March 31, 2019 and December 31, 2018. 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 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 2.0 to 1.0 (in each case as defined in the agreement).

The MTCH Term Loan and MTCH Credit Facility contain covenants that would limit MTCH’s ability to pay dividends, make distributions or repurchase MTCH stock in the event MTCH’s secured net leverage ratio exceeds 2.0 to 1.0, while the MTCH Term Loan remains outstanding and, thereafter, if the consolidated net leverage ratio exceeds 4.0 to 1.0, or in the event a default has occurred. There are additional covenants under these MTCH debt agreements that limit the ability of MTCH and its subsidiaries to, among other things, incur indebtedness, pay dividends or make distributions. Obligations under the MTCH Credit Facility and MTCH Term Loan are unconditionally guaranteed by certain MTCH wholly-owned domestic subsidiaries and are 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%, 5.00% and 5.625% MTCH Senior Notes to the extent of the value of the assets securing the borrowings under the MTCH credit agreement.

ANGI Term Loan and ANGI Credit Facility

At March 31, 2019 and December 31, 2018, the outstanding balance on the ANGI Term Loan was $257.8 million and $261.3 million, respectively. At both March 31, 2019 and December 31, 2018, the ANGI Term Loan bears interest at LIBOR plus 1.50%. The spread over LIBOR is subject to change in future periods based on ANGI's consolidated net leverage ratio. The interest rate was approximately 4.00% at both March 31, 2019 and December 31, 2018. Interest payments are due at least quarterly through the term of the loan. Additionally, there are quarterly principal payments of $3.4 million through December 31, 2021, $6.9 million for the one year period ending December 31, 2022 and $10.3 million through maturity of the loan when the final amount of $161.6 million is due.

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 2.0 to 1.0 (in each case as defined in the credit agreement). The ANGI Term Loan also contains covenants that would limit ANGI’s ability to pay dividends, make distributions or repurchase ANGI stock in the event a default has occurred or ANGI’s consolidated net leverage ratio exceeds 4.25 to 1.0. 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.

On November 5, 2018, ANGI entered into a five-year $250 million revolving credit facility (the "ANGI Credit Facility").

At March 31, 2019 and December 31, 2018, there were no outstanding borrowings under the ANGI Credit Facility. The annual commitment fee on undrawn funds is based on ANGI's consolidated net leverage ratio most recently reported, and is 25 basis points at both March 31, 2019 and December 31, 2018. 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 based on ANGI's consolidated net leverage ratio. The financial and other covenants are the same as those for the ANGI Term Loan.

The ANGI Term Loan and ANGI Credit Facility are guaranteed by ANGI's wholly-owned material domestic subsidiaries

and are 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 and in the first quarter of 2019; (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.

We separately account for the debt and the equity components of the Exchangeable Notes, and therefore, the Company recorded an original issue discount and corresponding increase to additional paid-in capital of $70.4 million, which is the fair value attributed to the exchange feature of the debt upon issuance. The Company is amortizing the original issue 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%. For the three months ended March 31, 2019 and 2018, the Company incurred interest

expense of $5.4 million and $5.2 million, which includes amortization of original issue discount of $3.4 million and $3.2 million, and debt issuance costs of $0.9 million and $0.9 million, respectively. As of March 31, 2019 and December 31, 2018, the unamortized original issue discount is $50.7 million and $54.0 million, resulting in a net carrying value of the liability component of $466.8 million and $463.5 million, respectively.

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 exceeded its principal amount by $197.0 million and $105.0 million based on the Company's stock price on March 31, 2019 and December 31, 2018, respectively. 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.

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 March 31, 2019, IAC has a $250 million revolving credit facility (the "IAC Credit Facility"), under which IAC Group, LLC, a subsidiary of the Company, is the borrower ("Borrower"), that expires on November 5, 2023. At March 31, 2019 and December 31, 2018, there were no outstanding borrowings under the IAC Credit Facility. The annual commitment fee on undrawn funds is based on the consolidated net leverage ratio (as defined in the agreement) most recently reported, and is 20 basis points at both March 31, 2019 and December 31, 2018. Borrowings under the IAC Credit Facility bear interest, at the Borrower'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 Borrower's consolidated net leverage ratio. The terms of the IAC Credit Facility require that the Borrower maintain a consolidated net leverage ratio of not more than 3.25 to 1.0 before the date on which the Borrower no longer holds majority of the outstanding voting stock of each of ANGI and MTCH ("Trigger Date") and no greater than 2.75 to 1.0 on or after the Trigger Date. The terms of the IAC Credit Facility also restrict the Borrower's 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, including the shares of MTCH and ANGI owned by the Borrower. 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

3 Months Ended

Mar. 31, 2019

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 March 31, 2019
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Debt Securities		Accumulated Other Comprehensive (Loss) Income
	(In thousands)
Balance as of January 1	$	(128,726	)	$	4	$	(128,722	)
Other comprehensive income	993			2		995
Net current period other comprehensive income	993			2		995
Allocation of accumulated other comprehensive income related to the noncontrolling interests	1,008			—		1,008
Balance as of March 31	$	(126,725	)	$	6	$	(126,719	)



	Three Months Ended March 31, 2018
	Foreign Currency Translation Adjustment			Accumulated Other Comprehensive (Loss) Income
	(In thousands)
Balance as of January 1	$	(103,568	)	$	(103,568	)
Other comprehensive income before reclassifications	28,218			28,218
Amounts reclassified to earnings	139			139
Net current period other comprehensive income	28,357			28,357
Allocation of accumulated other comprehensive income related to the noncontrolling interests	261			261
Balance as of March 31	$	(74,950	)	$	(74,950	)

The amount reclassified out of foreign currency translation adjustment into earnings for the three months ended March 31, 2018 relates to the liquidation of an international subsidiary.

At both March 31, 2019 and 2018, there was no tax benefit or provision on the accumulated other comprehensive loss.

EARNINGS PER SHARE

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

EARNINGS PER SHARE

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



	Three Months Ended March 31,
	2019						2018
	Basic			Diluted			Basic			Diluted
	(In thousands, except per share data)
Numerator:
Net earnings	$	112,985		$	112,985		$	87,839		$	87,839
Net earnings attributable to noncontrolling interests	(24,290		)	(24,290		)	(16,757		)	(16,757		)
Impact from public subsidiaries' dilutive securities^(a)	—			(6,696		)	—			(7,442		)
Net earnings attributable to IAC shareholders	$	88,695		$	81,999		$	71,082		$	63,640

Denominator:
Weighted average basic shares outstanding	83,905			83,905			82,983			82,983
Dilutive securities^{(a) (b) (c) (d)}	—			6,435			—			6,086
Denominator for earnings per share—weighted average shares^{(a) (b) (c) (d)}	83,905			90,340			82,983			89,069

Earnings per share attributable to IAC shareholders:
Earnings per share	$	1.06		$	0.91		$	0.86		$	0.71

_____________________


^(a)	IAC has the option to settle certain MTCH and ANGI stock-based awards in its shares. For the three months ended March 31, 2019 and 2018, 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. For the three months ended March 31, 2019 and 2018, 3.4 million and 6.8 million potentially dilutive securities, respectively, 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 three months ended March 31, 2019 and 2018, 0.3 million and 0.2 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 months ended March 31, 2019, the average price of IAC common stock exceeded $152.18 and the dilutive impact of the Exchangeable Notes was 0.9 million shares. For the three months ended March 31, 2018, the Exchangeable Notes were anti-dilutive.

SEGMENT INFORMATION

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

SEGMENT INFORMATION

The overall concept that the Company 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 or, in the case of the Emerging & Other reportable segment, do not meet the quantitative thresholds that require presentation as separate reportable segments.

The following table presents revenue by reportable segment:



	Three Months Ended March 31,
	2019			2018
	(In thousands)
Revenue:
Match Group	$	464,625		$	407,367
ANGI Homeservices	303,443			255,311
Vimeo	43,581			35,568
Dotdash	33,961			30,031
Applications	143,549			131,987
Emerging & Other	116,748			134,885
Inter-segment eliminations	(64		)	(74		)
Total	$	1,105,843		$	995,075

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



	Three Months Ended March 31,
	2019		2018
	(In thousands)
Match Group
Direct revenue:
North America	$	237,773	$	211,357
International	216,189		181,380
Total Direct revenue	453,962		392,737
Indirect revenue (principally advertising revenue)	10,663		14,630
Total Match Group revenue	$	464,625	$	407,367

ANGI Homeservices
Marketplace:
Consumer connection revenue	$	201,582	$	149,060
Membership subscription revenue	16,517		15,627
Other revenue	1,826		921
Marketplace revenue	219,925		165,608
Advertising and other revenue	62,069		70,418
Total North America	281,994		236,026
Consumer connection revenue	17,123		14,367
Membership subscription revenue	3,742		4,671
Advertising and other revenue	584		247
Total Europe	21,449		19,285
Total ANGI Homeservices revenue	$	303,443	$	255,311

Vimeo
Platform revenue	$	41,302	$	32,932
Hardware revenue	2,279		2,636
Total Vimeo revenue	$	43,581	$	35,568

Dotdash
Advertising revenue	$	28,919	$	25,744
Affiliate commerce commission and other revenue	5,042		4,287



	Three Months Ended March 31,
	2019		2018
	(In thousands)
Total Dotdash revenue	$	33,961	$	30,031

Applications
Desktop
Advertising revenue:
Google advertising revenue	$	88,050	$	108,577
Other	3,348		1,695
Advertising revenue	91,398		110,272
Subscription and other revenue	4,588		7,316
Total Desktop	95,986		117,588
Mosaic Group
Subscription and other revenue	45,148		9,009
Advertising revenue	2,415		5,390
Total Mosaic Group	47,563		14,399
Total Applications revenue	$	143,549	$	131,987

Emerging & Other
Advertising revenue:
Google advertising revenue	$	96,273	$	92,751
Other	6,977		13,269
Advertising revenue	103,250		106,020
Other revenue	13,498		28,865
Total Emerging & Other revenue	$	116,748	$	134,885

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 March 31,
	2019		2018
	(In thousands)
Revenue:
United States	$	712,381	$	657,580
All other countries	393,462		337,495
Total	$	1,105,843	$	995,075



	March 31, 2019		December 31, 2018
	(In thousands)
Long-lived assets (excluding goodwill and intangible assets):
United States	$	298,534	$	289,756
All other countries	27,354		29,044
Total	$	325,888	$	318,800

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



	Three Months Ended March 31,
	2019			2018
	(In thousands)
Operating Income (Loss):
Match Group	$	118,828		$	112,233
ANGI Homeservices	(3,641		)	(10,756		)
Vimeo	(17,784		)	(9,748		)
Dotdash	3,047			3,191
Applications	25,356			25,461
Emerging & Other	(2,520		)	6,493
Corporate	(43,413		)	(36,924		)
Total	$	79,873		$	89,950



	Three Months Ended March 31,
	2019			2018
	(In thousands)
Adjusted EBITDA^(a):
Match Group	$	155,067		$	137,741
ANGI Homeservices	$	37,179		$	36,640
Vimeo	$	(16,200	)	$	(7,784	)
Dotdash	$	7,150		$	3,849
Applications	$	29,688		$	26,752
Emerging & Other	$	(2,095	)	$	8,208
Corporate	$	(20,220	)	$	(17,008	)

_____________________

^(a)

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 because it excludes the impact of these 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 March 31, 2019
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	118,828		$	27,997	$	7,831	$	411	$	—	$	155,067
ANGI Homeservices	(3,641		)	$	19,282	$	6,999	$	14,539	$	—	$	37,179
Vimeo	(17,784		)	$	—	$	193	$	1,391	$	—	$	(16,200	)
Dotdash	3,047			$	—	$	226	$	3,877	$	—	$	7,150
Applications	25,356			$	—	$	419	$	2,384	$	1,529	$	29,688
Emerging & Other	(2,520		)	$	—	$	275	$	150	$	—	$	(2,095	)
Corporate	(43,413		)	$	20,165	$	3,028	$	—	$	—	$	(20,220	)
Operating income	79,873
Interest expense	(31,143		)
Other income, net	651
Earnings before income taxes	49,381
Income tax benefit	63,604
Net earnings	112,985
Net earnings attributable to noncontrolling interests	(24,290		)
Net earnings attributable to IAC shareholders	$	88,695



	Three Months Ended March 31, 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	$	112,233		$	16,963	$	8,147	$	242	$	156	$	137,741
ANGI Homeservices	(10,756		)	$	24,906	$	6,184	$	16,306	$	—	$	36,640
Vimeo	(9,748		)	$	—	$	335	$	1,629	$	—	$	(7,784	)
Dotdash	3,191			$	—	$	249	$	409	$	—	$	3,849
Applications	25,461			$	—	$	755	$	536	$	—	$	26,752
Emerging & Other	6,493			$	131	$	753	$	831	$	—	$	8,208
Corporate	(36,924		)	$	17,082	$	2,834	$	—	$	—	$	(17,008	)
Operating income	89,950
Interest expense	(26,505		)
Other expense, net	(4,619		)
Earnings before income taxes	58,826
Income tax benefit	29,013
Net earnings	87,839
Net earnings attributable to noncontrolling interests	(16,757		)
Net earnings attributable to IAC shareholders	$	71,082

CONSOLIDATED FINANCIAL STATEMENT DETAILS

3 Months Ended

Mar. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

CONSOLIDATED FINANCIAL STATEMENT DETAILS

Restricted Cash

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:



	March 31, 2019		December 31, 2018		March 31, 2018		December 31, 2017
	(In thousands)
Cash and cash equivalents	$	2,217,337	$	2,131,632	$	1,657,537	$	1,630,809
Restricted cash included in other current assets	1,635		1,633		2,860		2,873
Restricted cash included in other assets	416		420		—		—
Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows	$	2,219,388	$	2,133,685	$	1,660,397	$	1,633,682

Restricted cash at March 31, 2019 and December 31, 2018 primarily consist of a cash collateralized letter of credit and a deposit related to corporate credit cards.

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

Other income (expense), net



	Three Months Ended March 31,
	2019	2018
	(In thousands)
Other income (expense), net	$651	$(4,619)

Other income, net in 2019 includes: $12.4 million of interest income; $8.1 million loss related to the sale of a business; and $1.9 million in net foreign currency exchange losses due primarily to the weakening of the U.S. dollar and the Euro relative to the British Pound during the three months ended March 31, 2019.

Other expense, net in 2018 includes: $7.9 million in net foreign currency exchange losses due primarily to the weakening of the U.S. dollar relative to the British Pound and Euro during the three months ended March 31, 2018; and $5.2 million of interest income.

CONTINGENCIES	3 Months Ended
CONTINGENCIES	Mar. 31, 2019
Commitments and Contingencies Disclosure [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 4—Income Taxes" for additional information related to income tax contingencies. On August 14, 2018, ten then-current and former employees of Match Group, LLC or Tinder, Inc. ("Tinder"), an operating business of Match Group, filed a lawsuit in New York state court against IAC and Match Group. See Sean Rad et al. v. IAC/InterActiveCorp and Match Group, Inc., No. 654038/2018 (Supreme Court, New York County). The complaint alleges that in 2017, the defendants: (i) wrongfully interfered with a contractually established process for the independent valuation of Tinder by certain investment banks, resulting in a substantial undervaluation of Tinder and a consequent underpayment to the plaintiffs upon exercise of their Tinder stock options, and (ii) then wrongfully merged Tinder into Match Group, thereby depriving one of the plaintiffs (Mr. Rad) of his contractual right to later valuations of Tinder on a stand-alone basis. The complaint asserts claims for breach of contract, breach of the implied covenant of good faith and fair dealing, unjust enrichment, interference with contractual relations (as against Match Group only), and interference with prospective economic advantage, and seeks compensatory damages in the amount of at least $2 billion, as well as punitive damages. IAC and Match Group believe that the allegations in this lawsuit are without merit and will continue to defend vigorously against it.

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION

3 Months Ended

Mar. 31, 2019

Condensed Financial Information Disclosure [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 March 31, 2019 and December 31, 2018 and for the three months ended March 31, 2019 and 2018 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 March 31, 2019:



	IAC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Cash and cash equivalents	$	1,113,281	$	—	$	1,104,056		$	—		$	2,217,337
Marketable securities	39,954		—		447			—			40,401
Accounts receivable, net of allowance and reserves	—		89,587		256,099			—			345,686
Other current assets	27,074		32,254		167,891			(745		)	226,474
Intercompany receivables	—		1,445,130		—			(1,445,130		)	—
Right of use assets	561		41,185		147,816			(17,004		)	172,558
Property and equipment, net of accumulated depreciation and amortization	6,598		160,419		158,871			—			325,888
Goodwill	—		412,009		2,333,779			—			2,745,788
Intangible assets, net of accumulated amortization	—		40,037		568,072			—			608,109
Investment in subsidiaries	1,753,945		231,897		—			(1,985,842		)	—
Other non-current assets	285,842		94,691		233,400			(136,272		)	477,661
Total assets	$	3,227,255	$	2,547,209	$	4,970,431		$	(3,584,993	)	$	7,159,902

Current portion of long-term debt	$	—	$	—	$	13,750		$	—		$	13,750
Accounts payable, trade	790		33,600		49,145			—			83,535
Other current liabilities	22,158		83,816		709,213			(4,652		)	810,535
Long-term debt, net	34,277		—		2,297,957			—			2,332,234
Income taxes payable	—		1,660		34,516			—			36,176
Intercompany liabilities	389,873		—		1,055,257			(1,445,130		)	—
Other long-term liabilities	296		55,644		333,851			(149,369		)	240,422
Redeemable noncontrolling interests	—		—		71,914			—			71,914
Shareholders' equity (deficit)	2,779,861		2,372,489		(386,647		)	(1,985,842		)	2,779,861
Noncontrolling interests	—		—		791,475			—			791,475
Total liabilities and shareholders' equity	$	3,227,255	$	2,547,209	$	4,970,431		$	(3,584,993	)	$	7,159,902

Balance sheet at December 31, 2018:



	IAC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Cash and cash equivalents	$	1,018,082	$	—	$	1,113,550		$	—		$	2,131,632
Marketable securities	98,299		—		25,366			—			123,665
Accounts receivable, net of allowance and reserves	—		99,970		179,219			—			279,189
Other current assets	39,449		29,222		171,682			(12,100		)	228,253
Intercompany receivables	—		1,423,456		—			(1,423,456		)	—
Property and equipment, net of accumulated depreciation and amortization	6,526		163,281		148,993			—			318,800
Goodwill	—		412,009		2,314,850			—			2,726,859
Intangible assets, net of accumulated amortization	—		43,914		587,508			—			631,422
Investment in subsidiaries	1,897,699		214,519		—			(2,112,218		)	—
Other non-current assets	274,789		94,290		251,315			(185,629		)	434,765
Total assets	$	3,334,844	$	2,480,661	$	4,792,483		$	(3,733,403	)	$	6,874,585

Current portion of long-term debt	$	—	$	—	$	13,750		$	—		$	13,750
Accounts payable, trade	1,304		36,293		37,310			—			74,907
Other current liabilities	41,721		95,405		669,875			(12,100		)	794,901
Long-term debt, net	34,262		—		2,211,286			—			2,245,548
Income taxes payable	15		1,707		35,862			—			37,584
Intercompany liabilities	414,156		—		1,009,300			(1,423,456		)	—
Other long-term liabilities	261		18,181		257,594			(185,629		)	90,407
Redeemable noncontrolling interests	—		—		65,687			—			65,687
Shareholders' equity (deficit)	2,843,125		2,329,075		(216,857		)	(2,112,218		)	2,843,125
Noncontrolling interests	—		—		708,676			—			708,676
Total liabilities and shareholders' equity	$	3,334,844	$	2,480,661	$	4,792,483		$	(3,733,403	)	$	6,874,585

Statement of operations for the three months ended March 31, 2019:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	198,930		$	906,978		$	(65	)	$	1,105,843
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	24			82,146			177,966			(65		)	260,071
Selling and marketing expense	362			57,966			363,562			(30		)	421,860
General and administrative expense	38,259			10,534			164,793			30			213,616
Product development expense	647			12,037			76,016			—			88,700
Depreciation	378			2,922			15,671			—			18,971
Amortization of intangibles	—			3,877			18,875			—			22,752
Total operating costs and expenses	39,670			169,482			816,883			(65		)	1,025,970
Operating (loss) income	(39,670		)	29,448			90,095			—			79,873
Equity in earnings of unconsolidated affiliates	115,440			1,068			—			(116,508		)	—
Interest expense	(424		)	—			(30,719		)	—			(31,143		)
Other (expense) income, net	(1,897		)	13,851			420			(11,723		)	651
Earnings before income taxes	73,449			44,367			59,796			(128,231		)	49,381
Income tax benefit (provision)	15,246			(5,123		)	53,481			—			63,604
Net earnings	88,695			39,244			113,277			(128,231		)	112,985
Net earnings attributable to noncontrolling interests	—			—			(24,290		)	—			(24,290		)
Net earnings attributable to IAC shareholders	$	88,695		$	39,244		$	88,987		$	(128,231	)	$	88,695
Comprehensive income attributable to IAC shareholders	$	89,690		$	39,455		$	90,100		$	(129,555	)	$	89,690

Statement of operations for the three months ended March 31, 2018:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	212,889		$	782,260		$	(74	)	$	995,075
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	76			56,224			145,712			(50		)	201,962
Selling and marketing expense	213			90,138			312,526			(45		)	402,832
General and administrative expense	31,409			15,381			137,373			21			184,184
Product development expense	652			14,269			62,016			—			76,937
Depreciation	266			3,340			15,651			—			19,257
Amortization of intangibles	—			509			19,444			—			19,953
Total operating costs and expenses	32,616			179,861			692,722			(74		)	905,125
Operating (loss) income	(32,616		)	33,028			89,538			—			89,950
Equity in earnings (losses) of unconsolidated affiliates	102,750			(327		)	—			(102,423		)	—
Interest expense	(429		)	—			(26,076		)	—			(26,505		)
Other (expense) income, net^(a)	(16,847		)	286,883			2,190			(276,845		)	(4,619		)
Earnings before income taxes	52,858			319,584			65,652			(379,268		)	58,826
Income tax benefit (provision)	18,224			(10,966		)	21,755			—			29,013
Net earnings	71,082			308,618			87,407			(379,268		)	87,839
Net earnings attributable to noncontrolling interests	—			—			(16,757		)	—			(16,757		)
Net earnings attributable to IAC shareholders	$	71,082		$	308,618		$	70,650		$	(379,268	)	$	71,082
Comprehensive income attributable to IAC shareholders	$	99,439		$	308,961		$	105,327		$	(414,288	)	$	99,439

_____________________


^(a)	During the three months ended March 31, 2018, foreign cash of $276.0 million was repatriated to the U.S.

Statement of cash flows for the three months ended March 31, 2019:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities	$	(40,242	)	$	40,574		$	114,332		$	(11,723	)	$	102,941
Cash flows from investing activities:
Acquisitions, net of cash acquired	—			(1,214		)	(20,341		)	—			(21,555		)
Capital expenditures	(531		)	(39		)	(25,285		)	—			(25,855		)
Proceeds from maturities of marketable debt securities	98,500			—			25,000			—			123,500
Purchases of marketable debt securities	(39,740		)	—			—			—			(39,740		)
Net proceeds from the sale of businesses and investments	—			39			20,433			—			20,472
Other, net	—			(2,034		)	819			—			(1,215		)
Net cash provided by (used in) investing activities	58,229			(3,248		)	626			—			55,607
Cash flows from financing activities:
Borrowings under Match Group Credit Facility	—			—			40,000			—			40,000
Proceeds from Match Group 2019 Senior Notes offering	—			—			350,000			—			350,000
Principal payments on Match Group Credit Facility	—			—			(300,000		)	—			(300,000		)
Principal payment on ANGI Homeservices Term Loan	—			—			(3,438		)	—			(3,438		)
Debt issuance costs	—			—			(5,542		)	—			(5,542		)
Purchase of Match Group treasury stock	—			—			(24,186		)	—			(24,186		)
Proceeds from the exercise of IAC stock options	9,298			—			—			—			9,298
Proceeds from the exercise of Match Group and ANGI Homeservices stock options	—			—			573			—			573
Withholding taxes paid on behalf of IAC employees on net settled stock-based awards	(14,062		)	—			—			—			(14,062		)
Withholding taxes paid on behalf of Match Group and ANGI Homeservices employees on net settled stock-based awards	—			—			(123,148		)	—			(123,148		)
Purchase of noncontrolling interests	(3,182		)	—			—			—			(3,182		)
Distribution to IAC pursuant to the ANGI tax sharing agreement	11,355			—			(11,355		)	—			—
Intercompany	73,803			(37,326		)	(48,200		)	11,723			—
Other, net	—			—			27			—			27
Net cash provided by (used in) financing activities	77,212			(37,326		)	(125,269		)	11,723			(73,660		)
Total cash provided (used)	95,199			—			(10,311		)	—			84,888
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	—			—			815			—			815
Net increase (decrease) in cash, cash equivalents, and restricted cash	95,199			—			(9,496		)	—			85,703
Cash, cash equivalents, and restricted cash at beginning of period	1,018,082			—			1,115,603			—			2,133,685
Cash, cash equivalents, and restricted cash at end of period	$	1,113,281		$	—		$	1,106,107		$	—		$	2,219,388

Statement of cash flows for the three months ended March 31, 2018:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash provided by operating activities	$	1,562		$	319,686		$	107,605		$	(276,845	)	$	152,008
Cash flows from investing activities:
Acquisitions, net of cash acquired	(4,134		)	—			(17,161		)	—			(21,295		)
Capital expenditures	—			(570		)	(14,231		)	—			(14,801		)
Proceeds from maturities of marketable debt securities	5,000			—			—			—			5,000
Purchases of marketable debt securities	(4,975		)	—			—			—			(4,975		)
Net proceeds from the sale of investments	—			—			15			—			15
Purchases of investments	(18,180		)	—			—			—			(18,180		)
Other, net	(5,000		)	3,884			10,463			—			9,347
Net cash (used in) provided by investing activities	(27,289		)	3,314			(20,914		)	—			(44,889		)
Cash flows from financing activities:
Principal payment on ANGI Homeservices Term Loan	—			—			(3,438		)	—			(3,438		)
Debt issuance costs	—			—			(193		)	—			(193		)
Purchase of Match Group treasury stock	—			—			(32,465		)	—			(32,465		)
Proceeds from the exercise of IAC stock options	24,254			—			—			—			24,254
Proceeds from the exercise of Match Group and ANGI Homeservices stock options				—			1,752			—			1,752
Withholding taxes paid on behalf of IAC employees on net settled stock-based awards	(282		)	—			—			—			(282		)
Withholding taxes paid on behalf of Match Group and ANGI Homeservices employees on net settled stock-based awards	—			—			(75,028		)	—			(75,028		)
Purchase of noncontrolling interests	—			—			(234		)	—			(234		)
Acquisition-related contingent consideration payments	—			—			(185		)	—			(185		)
Intercompany	308,822			(323,000		)	(262,667		)	276,845			—
Other, net	2,674			—			(5		)	—			2,669
Net cash provided by (used in) financing activities	335,468			(323,000		)	(372,463		)	276,845			(83,150		)
Total cash provided (used)	309,741			—			(285,772		)	—			23,969
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	26			—			2,720			—			2,746
Net increase (decrease) in cash, cash equivalents, and restricted cash	309,767			—			(283,052		)	—			26,715
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	$	895,406		$	—		$	764,991		$	—		$	1,660,397

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Nature of Operations IAC has majority ownership of both Match Group, which includes Tinder, Match, PlentyOfFish and OkCupid, and ANGI Homeservices, which includes HomeAdvisor, Angie’s List and Handy, and also operates Vimeo and Dotdash, among many other online businesses.
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation 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.
Accounting for Investments and Equity Securities	Accounting for Investments and Equity Securities 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 the Financial Accounting Standards Board's ("FASB") issued Accounting Standards Update ("ASU") No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, following its adoption on January 1, 2018, with any changes to fair value 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 identical or similar investments of the same issuer; 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 its equity securities for impairment each reporting period when there are qualitative factors or events that indicate possible impairment. Factors we consider in making this determination include negative changes in industry and market conditions, financial performance, business prospects, and other relevant events and factors. When indicators of impairment exist, the Company prepares quantitative assessments of the fair value of our equity securities, which require judgment and the use of estimates. When our assessment indicates that the fair value of the security is below the carrying value, the Company writes down the security to its fair value and records the corresponding charge within other income (expense), net. 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.
Accounting Estimates	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: contingencies; 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 cash equivalents and marketable debt securities; 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	Certain Risks and ConcentrationsA 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").
Adoption of ASU No. 2016-02, Leases (Topic 842)	Adoption of ASU No. 2016-02, Leases (Topic 842) The Company adopted ASU No. 2016-02, Leases (Topic 842) ("ASC 842") effective January 1, 2019. ASC 842 superseded previously existing guidance on accounting for leases and generally requires all leases to be recognized in the statement of financial position. The adoption of ASC 842 resulted in the recognition of $154.7 million of right of use assets ("ROU assets") and related lease liabilities as of January 1, 2019, with no cumulative effect adjustment. The adoption of ASC 842 had no impact on the Company’s consolidated statement of operations and consolidated statement of cash flows. In addition, the adoption of ASC 842 did not impact the leverage calculations set forth in the agreements governing the outstanding debt or credit agreements of the Company or its subsidiaries, because, in each circumstance, the leverage calculations are not affected by the lease liabilities that were recorded upon adoption of ASC 842. The Company adopted ASC 842 prospectively and, therefore, did not revise comparative period information or disclosure. In addition, the Company elected the package of practical expedients permitted under ASC 842. See "Note 3—Leases" for additional information on the adoption of ASC 842.
Reclassifications	ReclassificationsCertain prior year amounts have been reclassified to conform to the current year presentation.
General Revenue Recognition	General Revenue RecognitionRevenue 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 expects to be entitled to in exchange for those services or goods.

LEASES (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Schedule of Supplemental Balance Sheet Information of Leases



Leases	Balance Sheet Classification	March 31, 2019
		(In thousands)
Assets:
Right of use assets	Right of use assets	$	172,558

Liabilities:
Current lease liabilities	Accrued expenses and other current liabilities	31,215
Long-term lease liabilities	Other long-term liabilities	185,752
Total lease liabilities		$	216,967

Schedule of Lease Cost and Other Information



Lease Cost	Income Statement Classification	Three Months Ended March 31, 2019
		(In thousands)
Fixed lease cost	Cost of revenue	$	1,075
Fixed lease cost	Selling and marketing expense	1,909
Fixed lease cost	General and administrative expense	7,190
Fixed lease cost	Product development expense	318
Total fixed lease cost ^(a)		10,492
Variable lease cost	Cost of revenue	157
Variable lease cost	Selling and marketing expense	304
Variable lease cost	General and administrative expense	1,804
Variable lease cost	Product development expense	54
Total variable lease cost		2,319
Net lease cost		$	12,811

_____________________

^(a)Includes approximately $1.3 million of short-term lease cost and $0.5 million of sublease income.



	Three Months Ended March 31, 2019
	(In thousands)
Other Information:
Right of use assets obtained in exchange for lease liabilities	$	28,270
Cash paid for amounts included in the measurement of lease liabilities	$	13,175

Schedule of Maturities of Operating Lease Liabilities

Maturities of lease liabilities^(b):



	March 31, 2019
	(In thousands)
2019	30,727
2020	41,238
2021	35,037
2022	28,211
2023	25,022
After 2023	230,683
Total	390,918
Less: Interest	173,951
Present value of lease liabilities	$	216,967

_____________________


^(b)	Lease payments exclude $54.5 million of legally binding minimum lease payments for leases signed but not yet commenced.

Schedule of Weighted-Average Lease Term and Discount Rate of Leases

The following are the weighted average assumptions used for lease term and discount rate:



	March 31, 2019
Remaining lease term	15.8 years
Discount rate	5.99	%

FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Marketable Securities

At March 31, 2019 and December 31, 2018, the fair value of marketable securities are as follows:



	March 31, 2019		December 31, 2018
	(In thousands)
Available-for-sale marketable debt securities	$	39,954	$	123,246
Marketable equity security	447		419
Total marketable securities	$	40,401	$	123,665

Schedule of Current Available-for-sale Marketable Securities

At December 31, 2018, current available-for-sale marketable debt securities were as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Treasury discount notes	$	112,291	$	3	$	(3	)	$	112,291
Commercial paper	10,955		—		—			10,955
Total available-for-sale marketable debt securities	$	123,246	$	3	$	(3	)	$	123,246

At March 31, 2019, 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	$	24,983	$	—	$	—	$	24,983
Commercial paper	14,971		—		—		14,971
Total available-for-sale marketable debt securities	$	39,954	$	—	$	—	$	39,954

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

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



	Three Months Ended March 31,
	2019		2018
	(In thousands)
Proceeds from maturities of available-for-sale marketable debt securities	$	123,500	$	5,000

Schedule of Realized and Unrealized Gains and Losses



	Three Months Ended March 31,
	2019			2018
	(In thousands)
Upward adjustments (gross unrealized gains)	$	—		$	—
Downward adjustments including impairment (gross unrealized losses)	(150		)	(192		)
Total	$	(150	)	$	(192	)



	Three Months Ended March 31,
	2019			2018
	(In thousands)
Realized gains (losses), net, for equity securities sold	$	78		$	(103	)
Unrealized (losses) gains, net, on equity securities held	(122		)	145
Total (losses) gains recognized, net, in other income (expense), net	$	(44	)	$	42

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:



	March 31, 2019
	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	$	733,882	$	—	$	—		$	733,882
Treasury discount notes	—		771,604		—			771,604
Commercial paper	—		118,740		—			118,740
Time deposits	—		110,036		—			110,036
Marketable securities:
Treasury discount notes	—		24,983		—			24,983
Commercial paper	—		14,971		—			14,971
Marketable equity security	447		—		—			447
Total	$	734,329	$	1,040,334	$	—		$	1,774,663

Liabilities:
Contingent consideration arrangement	$	—	$	—	$	(28,186	)	$	(28,186	)



	December 31, 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	$	880,815	$	—	$	—		$	880,815
Treasury discount notes	—		561,733		—			561,733
Commercial paper	—		162,417		—			162,417
Time deposits	—		90,036		—			90,036
Marketable securities:
Treasury discount notes	—		112,291		—			112,291
Commercial paper	—		10,955		—			10,955
Marketable equity security	419		—		—			419
Total	$	881,234	$	937,432	$	—		$	1,818,666

Liabilities:
Contingent consideration arrangements	$	—	$	—	$	(28,631	)	$	(28,631	)

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 March 31,
	2019			2018
	(In thousands)
Balance at January 1	$	(28,631	)	$	(2,647	)
Total net losses:
Included in earnings:
Fair value adjustments	(1,529		)	(156		)
Included in other comprehensive loss	(14		)	(110		)
Settlements	1,988			948
Balance at March 31	$	(28,186	)	$	(1,965	)

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:



	March 31, 2019						December 31, 2018
	Carrying Value			Fair Value			Carrying Value			Fair Value
	(In thousands)
Current portion of long-term debt	$	(13,750	)	$	(13,243	)	$	(13,750	)	$	(12,753	)
Long-term debt, net^(a)	(2,332,234		)	(2,683,980		)	(2,245,548		)	(2,460,204		)

_____________________

^(a)

At March 31, 2019 and December 31, 2018, the carrying value of long-term debt, net includes unamortized original issue discount and debt issuance costs of $88.8 million and $88.9 million, respectively.

LONG-TERM DEBT (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Schedule of Long-term Debt

Long-term debt consists of:



	March 31, 2019		December 31, 2018
	(In thousands)
MTCH Debt:
MTCH Term Loan due November 16, 2022	$	425,000	$	425,000
MTCH Credit Facility due December 7, 2023	—		260,000
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
5.625% Senior Notes due February 15, 2029 (the "5.625% MTCH Senior Notes"); interest payable each February 15 and August 15, commencing on August 15, 2019	350,000		—
Total MTCH long-term debt	1,625,000		1,535,000
Less: unamortized original issue discount	7,023		7,352
Less: unamortized debt issuance costs	16,321		11,737
Total MTCH debt, net	1,601,656		1,515,911

ANGI Debt:
ANGI Term Loan due November 5, 2023	257,813		261,250
Less: current portion of ANGI Term Loan	13,750		13,750
Less: unamortized debt issuance costs	2,399		2,529
Total ANGI debt, net	241,664		244,971

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		34,489
Total IAC long-term debt	551,989		551,989
Less: unamortized original issue discount	50,661		54,025
Less: unamortized debt issuance costs	12,414		13,298
Total IAC debt, net	488,914		484,666

Total long-term debt, net	$	2,332,234	$	2,245,548

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 470
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-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31, 2019
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Debt Securities		Accumulated Other Comprehensive (Loss) Income
	(In thousands)
Balance as of January 1	$	(128,726	)	$	4	$	(128,722	)
Other comprehensive income	993			2		995
Net current period other comprehensive income	993			2		995
Allocation of accumulated other comprehensive income related to the noncontrolling interests	1,008			—		1,008
Balance as of March 31	$	(126,725	)	$	6	$	(126,719	)



	Three Months Ended March 31, 2018
	Foreign Currency Translation Adjustment			Accumulated Other Comprehensive (Loss) Income
	(In thousands)
Balance as of January 1	$	(103,568	)	$	(103,568	)
Other comprehensive income before reclassifications	28,218			28,218
Amounts reclassified to earnings	139			139
Net current period other comprehensive income	28,357			28,357
Allocation of accumulated other comprehensive income related to the noncontrolling interests	261			261
Balance as of March 31	$	(74,950	)	$	(74,950	)

EARNINGS PER SHARE (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

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

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



	Three Months Ended March 31,
	2019						2018
	Basic			Diluted			Basic			Diluted
	(In thousands, except per share data)
Numerator:
Net earnings	$	112,985		$	112,985		$	87,839		$	87,839
Net earnings attributable to noncontrolling interests	(24,290		)	(24,290		)	(16,757		)	(16,757		)
Impact from public subsidiaries' dilutive securities^(a)	—			(6,696		)	—			(7,442		)
Net earnings attributable to IAC shareholders	$	88,695		$	81,999		$	71,082		$	63,640

Denominator:
Weighted average basic shares outstanding	83,905			83,905			82,983			82,983
Dilutive securities^{(a) (b) (c) (d)}	—			6,435			—			6,086
Denominator for earnings per share—weighted average shares^{(a) (b) (c) (d)}	83,905			90,340			82,983			89,069

Earnings per share attributable to IAC shareholders:
Earnings per share	$	1.06		$	0.91		$	0.86		$	0.71

_____________________


^(a)	IAC has the option to settle certain MTCH and ANGI stock-based awards in its shares. For the three months ended March 31, 2019 and 2018, it is more dilutive for IAC to settle certain ANGI equity awards and MTCH to settle certain MTCH equity awards.

^(b)

^(c)

^(d)

SEGMENT INFORMATION (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

The following table presents revenue by reportable segment:



	Three Months Ended March 31,
	2019			2018
	(In thousands)
Revenue:
Match Group	$	464,625		$	407,367
ANGI Homeservices	303,443			255,311
Vimeo	43,581			35,568
Dotdash	33,961			30,031
Applications	143,549			131,987
Emerging & Other	116,748			134,885
Inter-segment eliminations	(64		)	(74		)
Total	$	1,105,843		$	995,075

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



	Three Months Ended March 31,
	2019			2018
	(In thousands)
Operating Income (Loss):
Match Group	$	118,828		$	112,233
ANGI Homeservices	(3,641		)	(10,756		)
Vimeo	(17,784		)	(9,748		)
Dotdash	3,047			3,191
Applications	25,356			25,461
Emerging & Other	(2,520		)	6,493
Corporate	(43,413		)	(36,924		)
Total	$	79,873		$	89,950



	Three Months Ended March 31,
	2019			2018
	(In thousands)
Adjusted EBITDA^(a):
Match Group	$	155,067		$	137,741
ANGI Homeservices	$	37,179		$	36,640
Vimeo	$	(16,200	)	$	(7,784	)
Dotdash	$	7,150		$	3,849
Applications	$	29,688		$	26,752
Emerging & Other	$	(2,095	)	$	8,208
Corporate	$	(20,220	)	$	(17,008	)

_____________________

^(a)

Schedule of Disaggregation of Revenue

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



	Three Months Ended March 31,
	2019		2018
	(In thousands)
Match Group
Direct revenue:
North America	$	237,773	$	211,357
International	216,189		181,380
Total Direct revenue	453,962		392,737
Indirect revenue (principally advertising revenue)	10,663		14,630
Total Match Group revenue	$	464,625	$	407,367

ANGI Homeservices
Marketplace:
Consumer connection revenue	$	201,582	$	149,060
Membership subscription revenue	16,517		15,627
Other revenue	1,826		921
Marketplace revenue	219,925		165,608
Advertising and other revenue	62,069		70,418
Total North America	281,994		236,026
Consumer connection revenue	17,123		14,367
Membership subscription revenue	3,742		4,671
Advertising and other revenue	584		247
Total Europe	21,449		19,285
Total ANGI Homeservices revenue	$	303,443	$	255,311

Vimeo
Platform revenue	$	41,302	$	32,932
Hardware revenue	2,279		2,636
Total Vimeo revenue	$	43,581	$	35,568

Dotdash
Advertising revenue	$	28,919	$	25,744
Affiliate commerce commission and other revenue	5,042		4,287



	Three Months Ended March 31,
	2019		2018
	(In thousands)
Total Dotdash revenue	$	33,961	$	30,031

Applications
Desktop
Advertising revenue:
Google advertising revenue	$	88,050	$	108,577
Other	3,348		1,695
Advertising revenue	91,398		110,272
Subscription and other revenue	4,588		7,316
Total Desktop	95,986		117,588
Mosaic Group
Subscription and other revenue	45,148		9,009
Advertising revenue	2,415		5,390
Total Mosaic Group	47,563		14,399
Total Applications revenue	$	143,549	$	131,987

Emerging & Other
Advertising revenue:
Google advertising revenue	$	96,273	$	92,751
Other	6,977		13,269
Advertising revenue	103,250		106,020
Other revenue	13,498		28,865
Total Emerging & Other revenue	$	116,748	$	134,885

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 March 31,
	2019		2018
	(In thousands)
Revenue:
United States	$	712,381	$	657,580
All other countries	393,462		337,495
Total	$	1,105,843	$	995,075



	March 31, 2019		December 31, 2018
	(In thousands)
Long-lived assets (excluding goodwill and intangible assets):
United States	$	298,534	$	289,756
All other countries	27,354		29,044
Total	$	325,888	$	318,800

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 March 31, 2019
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	118,828		$	27,997	$	7,831	$	411	$	—	$	155,067
ANGI Homeservices	(3,641		)	$	19,282	$	6,999	$	14,539	$	—	$	37,179
Vimeo	(17,784		)	$	—	$	193	$	1,391	$	—	$	(16,200	)
Dotdash	3,047			$	—	$	226	$	3,877	$	—	$	7,150
Applications	25,356			$	—	$	419	$	2,384	$	1,529	$	29,688
Emerging & Other	(2,520		)	$	—	$	275	$	150	$	—	$	(2,095	)
Corporate	(43,413		)	$	20,165	$	3,028	$	—	$	—	$	(20,220	)
Operating income	79,873
Interest expense	(31,143		)
Other income, net	651
Earnings before income taxes	49,381
Income tax benefit	63,604
Net earnings	112,985
Net earnings attributable to noncontrolling interests	(24,290		)
Net earnings attributable to IAC shareholders	$	88,695



	Three Months Ended March 31, 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	$	112,233		$	16,963	$	8,147	$	242	$	156	$	137,741
ANGI Homeservices	(10,756		)	$	24,906	$	6,184	$	16,306	$	—	$	36,640
Vimeo	(9,748		)	$	—	$	335	$	1,629	$	—	$	(7,784	)
Dotdash	3,191			$	—	$	249	$	409	$	—	$	3,849
Applications	25,461			$	—	$	755	$	536	$	—	$	26,752
Emerging & Other	6,493			$	131	$	753	$	831	$	—	$	8,208
Corporate	(36,924		)	$	17,082	$	2,834	$	—	$	—	$	(17,008	)
Operating income	89,950
Interest expense	(26,505		)
Other expense, net	(4,619		)
Earnings before income taxes	58,826
Income tax benefit	29,013
Net earnings	87,839
Net earnings attributable to noncontrolling interests	(16,757		)
Net earnings attributable to IAC shareholders	$	71,082

CONSOLIDATED FINANCIAL STATEMENT DETAILS (Tables)

3 Months Ended

Mar. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Cash and Cash Equivalents



	March 31, 2019		December 31, 2018		March 31, 2018		December 31, 2017
	(In thousands)
Cash and cash equivalents	$	2,217,337	$	2,131,632	$	1,657,537	$	1,630,809
Restricted cash included in other current assets	1,635		1,633		2,860		2,873
Restricted cash included in other assets	416		420		—		—
Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows	$	2,219,388	$	2,133,685	$	1,660,397	$	1,633,682

Schedule of Restricted Cash



	March 31, 2019		December 31, 2018		March 31, 2018		December 31, 2017
	(In thousands)
Cash and cash equivalents	$	2,217,337	$	2,131,632	$	1,657,537	$	1,630,809
Restricted cash included in other current assets	1,635		1,633		2,860		2,873
Restricted cash included in other assets	416		420		—		—
Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows	$	2,219,388	$	2,133,685	$	1,660,397	$	1,633,682

Schedule of Other (Expense) Income, Net

Other income (expense), net



	Three Months Ended March 31,
	2019	2018
	(In thousands)
Other income (expense), net	$651	$(4,619)

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Tables)

3 Months Ended

Mar. 31, 2019

Condensed Financial Information Disclosure [Abstract]

Schedule of Condensed Balance Sheet

Balance sheet at March 31, 2019:



	IAC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Cash and cash equivalents	$	1,113,281	$	—	$	1,104,056		$	—		$	2,217,337
Marketable securities	39,954		—		447			—			40,401
Accounts receivable, net of allowance and reserves	—		89,587		256,099			—			345,686
Other current assets	27,074		32,254		167,891			(745		)	226,474
Intercompany receivables	—		1,445,130		—			(1,445,130		)	—
Right of use assets	561		41,185		147,816			(17,004		)	172,558
Property and equipment, net of accumulated depreciation and amortization	6,598		160,419		158,871			—			325,888
Goodwill	—		412,009		2,333,779			—			2,745,788
Intangible assets, net of accumulated amortization	—		40,037		568,072			—			608,109
Investment in subsidiaries	1,753,945		231,897		—			(1,985,842		)	—
Other non-current assets	285,842		94,691		233,400			(136,272		)	477,661
Total assets	$	3,227,255	$	2,547,209	$	4,970,431		$	(3,584,993	)	$	7,159,902

Current portion of long-term debt	$	—	$	—	$	13,750		$	—		$	13,750
Accounts payable, trade	790		33,600		49,145			—			83,535
Other current liabilities	22,158		83,816		709,213			(4,652		)	810,535
Long-term debt, net	34,277		—		2,297,957			—			2,332,234
Income taxes payable	—		1,660		34,516			—			36,176
Intercompany liabilities	389,873		—		1,055,257			(1,445,130		)	—
Other long-term liabilities	296		55,644		333,851			(149,369		)	240,422
Redeemable noncontrolling interests	—		—		71,914			—			71,914
Shareholders' equity (deficit)	2,779,861		2,372,489		(386,647		)	(1,985,842		)	2,779,861
Noncontrolling interests	—		—		791,475			—			791,475
Total liabilities and shareholders' equity	$	3,227,255	$	2,547,209	$	4,970,431		$	(3,584,993	)	$	7,159,902

Balance sheet at December 31, 2018:



	IAC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Cash and cash equivalents	$	1,018,082	$	—	$	1,113,550		$	—		$	2,131,632
Marketable securities	98,299		—		25,366			—			123,665
Accounts receivable, net of allowance and reserves	—		99,970		179,219			—			279,189
Other current assets	39,449		29,222		171,682			(12,100		)	228,253
Intercompany receivables	—		1,423,456		—			(1,423,456		)	—
Property and equipment, net of accumulated depreciation and amortization	6,526		163,281		148,993			—			318,800
Goodwill	—		412,009		2,314,850			—			2,726,859
Intangible assets, net of accumulated amortization	—		43,914		587,508			—			631,422
Investment in subsidiaries	1,897,699		214,519		—			(2,112,218		)	—
Other non-current assets	274,789		94,290		251,315			(185,629		)	434,765
Total assets	$	3,334,844	$	2,480,661	$	4,792,483		$	(3,733,403	)	$	6,874,585

Current portion of long-term debt	$	—	$	—	$	13,750		$	—		$	13,750
Accounts payable, trade	1,304		36,293		37,310			—			74,907
Other current liabilities	41,721		95,405		669,875			(12,100		)	794,901
Long-term debt, net	34,262		—		2,211,286			—			2,245,548
Income taxes payable	15		1,707		35,862			—			37,584
Intercompany liabilities	414,156		—		1,009,300			(1,423,456		)	—
Other long-term liabilities	261		18,181		257,594			(185,629		)	90,407
Redeemable noncontrolling interests	—		—		65,687			—			65,687
Shareholders' equity (deficit)	2,843,125		2,329,075		(216,857		)	(2,112,218		)	2,843,125
Noncontrolling interests	—		—		708,676			—			708,676
Total liabilities and shareholders' equity	$	3,334,844	$	2,480,661	$	4,792,483		$	(3,733,403	)	$	6,874,585

Schedule of Condensed Income Statement

Statement of operations for the three months ended March 31, 2019:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	198,930		$	906,978		$	(65	)	$	1,105,843
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	24			82,146			177,966			(65		)	260,071
Selling and marketing expense	362			57,966			363,562			(30		)	421,860
General and administrative expense	38,259			10,534			164,793			30			213,616
Product development expense	647			12,037			76,016			—			88,700
Depreciation	378			2,922			15,671			—			18,971
Amortization of intangibles	—			3,877			18,875			—			22,752
Total operating costs and expenses	39,670			169,482			816,883			(65		)	1,025,970
Operating (loss) income	(39,670		)	29,448			90,095			—			79,873
Equity in earnings of unconsolidated affiliates	115,440			1,068			—			(116,508		)	—
Interest expense	(424		)	—			(30,719		)	—			(31,143		)
Other (expense) income, net	(1,897		)	13,851			420			(11,723		)	651
Earnings before income taxes	73,449			44,367			59,796			(128,231		)	49,381
Income tax benefit (provision)	15,246			(5,123		)	53,481			—			63,604
Net earnings	88,695			39,244			113,277			(128,231		)	112,985
Net earnings attributable to noncontrolling interests	—			—			(24,290		)	—			(24,290		)
Net earnings attributable to IAC shareholders	$	88,695		$	39,244		$	88,987		$	(128,231	)	$	88,695
Comprehensive income attributable to IAC shareholders	$	89,690		$	39,455		$	90,100		$	(129,555	)	$	89,690

Statement of operations for the three months ended March 31, 2018:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	212,889		$	782,260		$	(74	)	$	995,075
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	76			56,224			145,712			(50		)	201,962
Selling and marketing expense	213			90,138			312,526			(45		)	402,832
General and administrative expense	31,409			15,381			137,373			21			184,184
Product development expense	652			14,269			62,016			—			76,937
Depreciation	266			3,340			15,651			—			19,257
Amortization of intangibles	—			509			19,444			—			19,953
Total operating costs and expenses	32,616			179,861			692,722			(74		)	905,125
Operating (loss) income	(32,616		)	33,028			89,538			—			89,950
Equity in earnings (losses) of unconsolidated affiliates	102,750			(327		)	—			(102,423		)	—
Interest expense	(429		)	—			(26,076		)	—			(26,505		)
Other (expense) income, net^(a)	(16,847		)	286,883			2,190			(276,845		)	(4,619		)
Earnings before income taxes	52,858			319,584			65,652			(379,268		)	58,826
Income tax benefit (provision)	18,224			(10,966		)	21,755			—			29,013
Net earnings	71,082			308,618			87,407			(379,268		)	87,839
Net earnings attributable to noncontrolling interests	—			—			(16,757		)	—			(16,757		)
Net earnings attributable to IAC shareholders	$	71,082		$	308,618		$	70,650		$	(379,268	)	$	71,082
Comprehensive income attributable to IAC shareholders	$	99,439		$	308,961		$	105,327		$	(414,288	)	$	99,439

_____________________

^(a)

During the three months ended March 31, 2018, foreign cash of $276.0 million was repatriated to the U.S.

Schedule of Condensed Cash Flow Statement

Statement of cash flows for the three months ended March 31, 2019:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities	$	(40,242	)	$	40,574		$	114,332		$	(11,723	)	$	102,941
Cash flows from investing activities:
Acquisitions, net of cash acquired	—			(1,214		)	(20,341		)	—			(21,555		)
Capital expenditures	(531		)	(39		)	(25,285		)	—			(25,855		)
Proceeds from maturities of marketable debt securities	98,500			—			25,000			—			123,500
Purchases of marketable debt securities	(39,740		)	—			—			—			(39,740		)
Net proceeds from the sale of businesses and investments	—			39			20,433			—			20,472
Other, net	—			(2,034		)	819			—			(1,215		)
Net cash provided by (used in) investing activities	58,229			(3,248		)	626			—			55,607
Cash flows from financing activities:
Borrowings under Match Group Credit Facility	—			—			40,000			—			40,000
Proceeds from Match Group 2019 Senior Notes offering	—			—			350,000			—			350,000
Principal payments on Match Group Credit Facility	—			—			(300,000		)	—			(300,000		)
Principal payment on ANGI Homeservices Term Loan	—			—			(3,438		)	—			(3,438		)
Debt issuance costs	—			—			(5,542		)	—			(5,542		)
Purchase of Match Group treasury stock	—			—			(24,186		)	—			(24,186		)
Proceeds from the exercise of IAC stock options	9,298			—			—			—			9,298
Proceeds from the exercise of Match Group and ANGI Homeservices stock options	—			—			573			—			573
Withholding taxes paid on behalf of IAC employees on net settled stock-based awards	(14,062		)	—			—			—			(14,062		)
Withholding taxes paid on behalf of Match Group and ANGI Homeservices employees on net settled stock-based awards	—			—			(123,148		)	—			(123,148		)
Purchase of noncontrolling interests	(3,182		)	—			—			—			(3,182		)
Distribution to IAC pursuant to the ANGI tax sharing agreement	11,355			—			(11,355		)	—			—
Intercompany	73,803			(37,326		)	(48,200		)	11,723			—
Other, net	—			—			27			—			27
Net cash provided by (used in) financing activities	77,212			(37,326		)	(125,269		)	11,723			(73,660		)
Total cash provided (used)	95,199			—			(10,311		)	—			84,888
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	—			—			815			—			815
Net increase (decrease) in cash, cash equivalents, and restricted cash	95,199			—			(9,496		)	—			85,703
Cash, cash equivalents, and restricted cash at beginning of period	1,018,082			—			1,115,603			—			2,133,685
Cash, cash equivalents, and restricted cash at end of period	$	1,113,281		$	—		$	1,106,107		$	—		$	2,219,388

Statement of cash flows for the three months ended March 31, 2018:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash provided by operating activities	$	1,562		$	319,686		$	107,605		$	(276,845	)	$	152,008
Cash flows from investing activities:
Acquisitions, net of cash acquired	(4,134		)	—			(17,161		)	—			(21,295		)
Capital expenditures	—			(570		)	(14,231		)	—			(14,801		)
Proceeds from maturities of marketable debt securities	5,000			—			—			—			5,000
Purchases of marketable debt securities	(4,975		)	—			—			—			(4,975		)
Net proceeds from the sale of investments	—			—			15			—			15
Purchases of investments	(18,180		)	—			—			—			(18,180		)
Other, net	(5,000		)	3,884			10,463			—			9,347
Net cash (used in) provided by investing activities	(27,289		)	3,314			(20,914		)	—			(44,889		)
Cash flows from financing activities:
Principal payment on ANGI Homeservices Term Loan	—			—			(3,438		)	—			(3,438		)
Debt issuance costs	—			—			(193		)	—			(193		)
Purchase of Match Group treasury stock	—			—			(32,465		)	—			(32,465		)
Proceeds from the exercise of IAC stock options	24,254			—			—			—			24,254
Proceeds from the exercise of Match Group and ANGI Homeservices stock options				—			1,752			—			1,752
Withholding taxes paid on behalf of IAC employees on net settled stock-based awards	(282		)	—			—			—			(282		)
Withholding taxes paid on behalf of Match Group and ANGI Homeservices employees on net settled stock-based awards	—			—			(75,028		)	—			(75,028		)
Purchase of noncontrolling interests	—			—			(234		)	—			(234		)
Acquisition-related contingent consideration payments	—			—			(185		)	—			(185		)
Intercompany	308,822			(323,000		)	(262,667		)	276,845			—
Other, net	2,674			—			(5		)	—			2,669
Net cash provided by (used in) financing activities	335,468			(323,000		)	(372,463		)	276,845			(83,150		)
Total cash provided (used)	309,741			—			(285,772		)	—			23,969
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	26			—			2,720			—			2,746
Net increase (decrease) in cash, cash equivalents, and restricted cash	309,767			—			(283,052		)	—			26,715
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	$	895,406		$	—		$	764,991		$	—		$	1,660,397

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Revenue and Other [Line Items]
Revenue	$ 1,105,843	$ 995,075
Accounts receivable, net of allowance and reserves	345,686			$ 279,189
Right of use operating lease assets	172,558			0
Lease liability	216,967
Operating segments \| Applications
Revenue and Other [Line Items]
Revenue	143,549	131,987
Operating segments \| Emerging & Other
Revenue and Other [Line Items]
Revenue	116,748	134,885
Google Inc. \| Revenue \| Customer concentration risk
Revenue and Other [Line Items]
Revenue	$ 195,800	$ 211,300
Concentration risk (as a percent)	18.00%	21.00%
Google Inc. \| Revenue \| Customer concentration risk \| Operating segments \| Applications
Revenue and Other [Line Items]
Revenue	$ 88,100	$ 108,600
Google Inc. \| Revenue \| Customer concentration risk \| Operating segments \| Emerging & Other
Revenue and Other [Line Items]
Revenue	96,300	$ 92,800
Google Inc. \| Accounts Receivable \| Customer concentration risk
Revenue and Other [Line Items]
Accounts receivable, net of allowance and reserves	$ 71,600			$ 69,100
Accounting Standards Update 2016-02
Revenue and Other [Line Items]
Right of use operating lease assets			$ 154,700
Lease liability			$ 154,700
Match Group
Revenue and Other [Line Items]
Economic interest (as a percent)	80.40%
Voting interest (as a percent)	97.50%
ANGI Homeservices
Revenue and Other [Line Items]
Economic interest (as a percent)	83.30%
Voting interest (as a percent)	98.00%

REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Current deferred revenue	$ 386,943	$ 360,000	$ 360,015
Noncurrent deferred revenue	1,500	$ 1,700
Deferred revenue recognized during period	234,800
Noncurrent capitalized sales commissions	$ 42,300		$ 40,500

LEASES - Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets:
Right of use assets	$ 172,558	$ 0
Liabilities:
Current lease liabilities	31,215
Long-term lease liabilities	185,752
Total lease liabilities	$ 216,967

LEASES - Lease Cost (Details) $ in Thousands	3 Months Ended
LEASES - Lease Cost (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Fixed lease cost	$ 10,492
Variable lease cost	2,319
Net lease cost	12,811
Short-term lease cost	1,300
Sublease income	500
Cost of revenue
Lessee, Lease, Description [Line Items]
Fixed lease cost	1,075
Variable lease cost	157
Selling and marketing expense
Lessee, Lease, Description [Line Items]
Fixed lease cost	1,909
Variable lease cost	304
General and administrative expense
Lessee, Lease, Description [Line Items]
Fixed lease cost	7,190
Variable lease cost	1,804
Product development expense
Lessee, Lease, Description [Line Items]
Fixed lease cost	318
Variable lease cost	$ 54

LEASES - Operating Lease Liabilities Maturities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Leases [Abstract]
2019	$ 30,727
2020	41,238
2021	35,037
2022	28,211
2023	25,022
After 2023	230,683
Total	390,918
Less: Interest	173,951
Present value of lease liabilities	216,967
Leases signed but not yet commenced	$ 54,500

LEASES - Weighted-Average Remaining Term and Discount Rate (Details)	Mar. 31, 2019
Leases [Abstract]
Remaining lease term	15 years 9 months 18 days
Discount rate (as a percent)	5.99%

LEASES - Other Information (Details) $ in Thousands	3 Months Ended
LEASES - Other Information (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Other Information:
Right of use assets obtained in exchange for lease liabilities	$ 28,270
Cash paid for amounts included in the measurement of lease liabilities	$ 13,175

INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ (63,604)	$ (29,013)
Unrecognized tax benefits including interest and penalties	51,300		$ 52,300
Unrecognized tax benefit, if subsequently recognized would reduce income tax expense	48,000		$ 49,100
Decrease in unrecognized tax benefit, reasonably possible within twelve months	24,000
Decrease in unrecognized tax benefit, reasonably possible within twelve months which would reduce the income tax provision	$ 23,500

FINANCIAL INSTRUMENTS - Narrative (Details)	3 Months Ended
FINANCIAL INSTRUMENTS - Narrative (Details)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Feb. 15, 2019	Dec. 31, 2018 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
Gross realized gains	0	$ 0
Gross realized losses	0	$ 0
Assets measured at fair value on a nonrecurring basis
Equity securities without readily determinable fair values	234,600,000			$ 235,100,000
Total upward adjustments to equity securities without readily determinable fair value	129,000,000.0
Total downward adjustments to equity securities without readily determinable fair value	(2,600,000)
Contingent Consideration Arrangements
Contingent consideration, maximum amount at balance sheet date	45,000,000.0
Contingent consideration, fair value at balance sheet date with a maximum limit	44,000,000.0
Payment for contingent consideration arrangement	2,000,000.0
Contingent consideration, at fair value, noncurrent	28,200,000			26,600,000
Contingent consideration, at fair value, current	$ 0			$ 2,000,000.0
Match Group \| Senior Notes \| 5.625% MTCH Senior Notes
Contingent Consideration Arrangements
Stated interest rate (as a percent)	5.625%		5.625%
Measurement Input, Discount Rate \| Contingent Consideration Arrangements
Contingent Consideration Arrangements
Contingent consideration, discount rates (as a percent)	0.25
Minimum \| Measurement Input, Discount Rate \| Contingent Consideration Arrangements
Contingent Consideration Arrangements
Contingent consideration, discount rates (as a percent)				0.12
Maximum \| Measurement Input, Discount Rate \| Contingent Consideration Arrangements
Contingent Consideration Arrangements
Contingent consideration, discount rates (as a percent)				0.25

FINANCIAL INSTRUMENTS - Fair Value of Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Available-for-sale marketable debt securities	$ 39,954	$ 123,246
Marketable equity security	447	419
Total marketable securities	$ 40,401	$ 123,665

FINANCIAL INSTRUMENTS - Current Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Marketable Securities
Amortized Cost	$ 39,954	$ 123,246
Gross Unrealized Gains	0	3
Gross Unrealized Losses	0	(3)
Fair Value	39,954	123,246
Treasury discount notes
Schedule of Available-for-sale Marketable Securities
Amortized Cost	24,983	112,291
Gross Unrealized Gains	0	3
Gross Unrealized Losses	0	(3)
Fair Value	24,983	112,291
Commercial paper
Schedule of Available-for-sale Marketable Securities
Amortized Cost	14,971	10,955
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 14,971	$ 10,955

FINANCIAL INSTRUMENTS - Proceeds from Maturities and Sales of Current Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Proceeds from maturities of available-for-sale marketable debt securities	$ 123,500	$ 5,000

FINANCIAL INSTRUMENTS - Realized and Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Adjustments to Carrying Value of Non-Marketable Equity Securities [Abstract]
Upward adjustments (gross unrealized gains)	$ 0	$ 0
Downward adjustments including impairment (gross unrealized losses)	(150)	(192)
Total	(150)	(192)
Adjustments to Carrying Value of Non-Marketable Equity Securities [Abstract]
Realized gains (losses), net, for equity securities sold	78	(103)
Unrealized (losses) gains, net, on equity securities held	(122)	145
Total (losses) gains recognized, net, in other income (expense), net	$ (44)	$ 42

FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets:
Marketable securities	$ 39,954	$ 123,246
Marketable equity security	447	419
Assets, Fair Value Disclosure	1,774,663	1,818,666
Liabilities:
Contingent consideration arrangement	(28,186)	(28,631)
Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Assets, Fair Value Disclosure	734,329	881,234
Liabilities:
Contingent consideration arrangement	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Assets, Fair Value Disclosure	1,040,334	937,432
Liabilities:
Contingent consideration arrangement	0	0
Significant Unobservable Inputs (Level 3)
Assets:
Assets, Fair Value Disclosure	0	0
Liabilities:
Contingent consideration arrangement	(28,186)	(28,631)
Money market funds
Assets:
Cash equivalents	733,882	880,815
Money market funds \| Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	733,882	880,815
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	771,604	561,733
Marketable securities	24,983	112,291
Treasury discount notes \| Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	0	0
Marketable securities	0	0
Treasury discount notes \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	771,604	561,733
Marketable securities	24,983	112,291
Treasury discount notes \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0	0
Marketable securities	0	0
Commercial paper
Assets:
Cash equivalents	118,740	162,417
Marketable securities	14,971	10,955
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	118,740	162,417
Marketable securities	14,971	10,955
Commercial paper \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0	0
Marketable securities	0	0
Time deposits
Assets:
Cash equivalents	110,036	90,036
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	110,036	90,036
Time deposits \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0	0
Marketable equity security
Assets:
Marketable equity security	447	419
Marketable equity security \| Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Marketable equity security	447	419
Marketable equity security \| Significant Other Observable Inputs (Level 2)
Assets:
Marketable equity security	0	0
Marketable equity security \| Significant Unobservable Inputs (Level 3)
Assets:
Marketable equity security	$ 0	$ 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
	Mar. 31, 2019	Mar. 31, 2018
Contingent Consideration Arrangements
Balance at beginning of period	$ (28,631)	$ (2,647)
Fair value adjustments	(1,529)	(156)
Included in other comprehensive loss	(14)	(110)
Settlements	1,988	948
Balance at end of period	$ (28,186)	$ (1,965)

FINANCIAL INSTRUMENTS - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
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	(2,332,234)	(2,245,548)
Unamortized original issue discount and debt issuance costs	88,800	88,900
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	(2,332,234)	(2,245,548)
Fair Value
Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current portion of long-term debt	(13,243)	(12,753)
Long-term debt, net of current portion	$ (2,683,980)	$ (2,460,204)

LONG-TERM DEBT - Narrative (Details)				3 Months Ended		12 Months Ended			31 Months Ended
LONG-TERM DEBT - Narrative (Details)	Dec. 31, 2018 USD ($)	Nov. 05, 2018 USD ($)	Oct. 02, 2017 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($)	Nov. 05, 2023 USD ($)	Nov. 05, 2022 USD ($)	Dec. 31, 2018 USD ($)	Nov. 05, 2021 USD ($)	Feb. 15, 2019 USD ($)	Dec. 04, 2017 USD ($)	Jun. 01, 2016
Debt Instrument [Line Items]
Exchange price per share (USD per share) \| $ / shares				$ 152.18
IAC
Debt Instrument [Line Items]
Outstanding balance of debt instrument	$ 551,989,000			$ 551,989,000				$ 551,989,000
Net unamortized discount (premium)	54,025,000			50,661,000				54,025,000
IAC Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				250,000,000
Borrowings outstanding of credit facility	$ 0			$ 0				$ 0
Annual commitment fee on undrawn funds, basis points (as a percent)				0.20%				0.20%
IAC Credit Facility \| Maximum \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum leverage ratio	2.75			3.25
Match Group
Debt Instrument [Line Items]
Outstanding balance of debt instrument	$ 1,535,000,000			$ 1,625,000,000				$ 1,535,000,000
Net unamortized discount (premium)	7,352,000			$ 7,023,000				$ 7,352,000
Match Group \| MTCH Term Loan due November 16, 2022 \| Maximum \| Revolving Credit Facility
Debt Instrument [Line Items]
Leverage ratio limiting ability to pay dividends, make distributions, or repurchase stock				4.0
Match Group \| MTCH Credit Facility due December 7, 2023 \| Revolving Credit Facility
Debt Instrument [Line Items]
Annual commitment fee on undrawn funds, basis points (as a percent)				0.25%				0.25%
Match Group \| MTCH Credit Facility due December 7, 2023 \| Maximum \| Revolving Credit Facility
Debt Instrument [Line Items]
Leverage ratio limiting ability to pay dividends, make distributions, or repurchase stock				2.0
ANGI Homeservices \| ANGI Homeservices Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 250,000,000
Borrowings outstanding of credit facility	0			$ 0				$ 0
Annual commitment fee on undrawn funds, basis points (as a percent)				0.25%				0.25%
Debt instrument term		5 years
Senior Notes \| IAC
Debt Instrument [Line Items]
Outstanding balance of debt instrument	463,500,000		$ 517,500,000	$ 466,800,000				$ 463,500,000
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	5 days
Period of consecutive reported sale price of common stock (trading days)			30 days	5 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%
Amount of debt discount and increase to additional paid in capital			$ 70,400,000
Outstanding stock (shares) \| shares				3,400,000
Outstanding warrants (shares) \| shares				3,400,000
Exercise price of warrants (USD per share) \| $ / shares				$ 229.70
If-converted value in excess of principal				$ 197,000,000.0				105,000,000.0
Interest expense				5,400,000	$ 5,200,000
Amortization of debt discount (premium)				3,400,000	3,200,000
Amortization of debt issuance costs				900,000	$ 900,000
Net unamortized discount (premium)	54,000,000.0			$ 50,700,000				54,000,000.0
Senior Notes \| 6.375% MTCH Senior Notes \| Maximum
Debt Instrument [Line Items]
Maximum leverage ratio				5.0
Senior Notes \| Exchangeable Notes \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)			0.875%	0.875%
Outstanding balance of debt instrument	517,500,000			$ 517,500,000				517,500,000
Senior Notes \| Exchangeable Notes \| Maximum \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)				3.88%
Senior Notes \| Exchangeable Notes \| Minimum \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)				0.875%
Senior Notes \| 4.75% Senior Notes \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)				4.75%
Outstanding balance of debt instrument	34,489,000			$ 34,489,000				34,489,000
Senior Notes \| Match Group \| 6.375% MTCH Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)				6.375%								6.375%
Outstanding balance of debt instrument	400,000,000			$ 400,000,000				400,000,000
Senior Notes \| Match Group \| 5.00% MTCH Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)				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 \| 5.625% MTCH Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)				5.625%						5.625%
Outstanding balance of debt instrument	0			$ 350,000,000				0		$ 350,000,000
Term Loan \| Match Group \| MTCH Term Loan due November 16, 2022
Debt Instrument [Line Items]
Outstanding balance of debt instrument	425,000,000			$ 425,000,000				$ 425,000,000
Basis spread on variable rate (as a percent)				5.08%				5.09%
Term Loan \| Match Group \| MTCH Term Loan due November 16, 2022 \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				2.50%
Term Loan \| ANGI Homeservices \| ANGI Term Loan due November 5, 2023
Debt Instrument [Line Items]
Outstanding balance of debt instrument	261,250,000			$ 257,813,000				$ 261,250,000
Basis spread on variable rate (as a percent)				4.00%				4.00%
Term Loan \| ANGI Homeservices \| ANGI Term Loan due November 5, 2023 \| Forecast
Debt Instrument [Line Items]
Quarterly repayments of principal						$ 10,300,000	$ 6,900,000		$ 3,400,000
Final principal payment						$ 161,600,000
Term Loan \| ANGI Homeservices \| ANGI Term Loan due November 5, 2023 \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.50%				1.50%
Term Loan \| ANGI Homeservices \| ANGI Term Loan due November 5, 2023 \| Maximum
Debt Instrument [Line Items]
Maximum leverage ratio				4.5
Leverage ratio limiting ability to pay dividends, make distributions, or repurchase stock				4.25
Term Loan \| ANGI Homeservices \| ANGI Term Loan due November 5, 2023 \| Minimum
Debt Instrument [Line Items]
Minimum interest coverage ratio				2.0
Credit Facility \| Match Group \| MTCH Credit Facility due December 7, 2023
Debt Instrument [Line Items]
Outstanding balance of debt instrument	$ 260,000,000			$ 0				$ 260,000,000
Maximum borrowing capacity				500,000,000
Borrowings outstanding of credit facility				$ 0
Effective interest rate (as a percent)	4.00%							4.00%
Credit Facility \| Match Group \| MTCH Credit Facility due December 7, 2023 \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)								1.50%
Credit Facility \| Match Group \| MTCH Credit Facility due December 7, 2023 \| Maximum
Debt Instrument [Line Items]
Maximum leverage ratio				5.0
Credit Facility \| Match Group \| MTCH Credit Facility due December 7, 2023 \| Minimum
Debt Instrument [Line Items]
Minimum interest coverage ratio				2.0

LONG-TERM DEBT - Schedule of Long-Term Debt (Details) - USD ($)	Mar. 31, 2019	Feb. 15, 2019	Dec. 31, 2018	Dec. 04, 2017	Oct. 02, 2017	Jun. 01, 2016
Debt Instrument [Line Items]
Current portion of long-term debt	$ 13,750,000		$ 13,750,000
Long-term debt, net	2,332,234,000		2,245,548,000
Match Group
Debt Instrument [Line Items]
Long-term debt	1,625,000,000		1,535,000,000
Less: unamortized original issue discount	7,023,000		7,352,000
Less: unamortized debt issuance costs	16,321,000		11,737,000
Long-term debt, net	1,601,656,000		1,515,911,000
Match Group \| Term Loan \| MTCH Term Loan due November 16, 2022
Debt Instrument [Line Items]
Long-term debt	425,000,000		425,000,000
Match Group \| Credit Facility \| MTCH Credit Facility due December 7, 2023
Debt Instrument [Line Items]
Long-term debt	0		260,000,000
Match Group \| Senior Notes \| 6.375% MTCH 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%
Match Group \| Senior Notes \| 5.00% MTCH Senior Notes
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%
Match Group \| Senior Notes \| 5.625% MTCH Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 350,000,000	$ 350,000,000	0
Stated interest rate (as a percent)	5.625%	5.625%
ANGI Homeservices
Debt Instrument [Line Items]
Current portion of long-term debt	$ 13,750,000		13,750,000
Less: unamortized debt issuance costs	2,399,000		2,529,000
Long-term debt, net	241,664,000		244,971,000
ANGI Homeservices \| Term Loan \| ANGI Term Loan due November 5, 2023
Debt Instrument [Line Items]
Long-term debt	257,813,000		261,250,000
IAC
Debt Instrument [Line Items]
Long-term debt	551,989,000		551,989,000
Less: unamortized original issue discount	50,661,000		54,025,000
Less: unamortized debt issuance costs	12,414,000		13,298,000
Long-term debt, net	488,914,000		484,666,000
IAC \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	466,800,000		463,500,000		$ 517,500,000
Less: unamortized original issue discount	50,700,000		54,000,000.0
IAC \| Senior Notes \| Exchangeable Notes
Debt Instrument [Line Items]
Long-term debt	$ 517,500,000		517,500,000
Stated interest rate (as a percent)	0.875%				0.875%
IAC \| Senior Notes \| 4.75% Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 34,489,000		$ 34,489,000
Stated interest rate (as a percent)	4.75%

ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	$ 3,551,801,000	$ 2,946,823,000
Total other comprehensive income	1,310,000	35,393,000
Balance at end of period	3,571,336,000	3,082,391,000
Tax provision (benefit) on accumulated other comprehensive loss	0	0
Foreign Currency Translation Adjustment Attributable To Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(128,726,000)	(103,568,000)
Balance at end of period	(126,725,000)	(74,950,000)
Unrealized Gains On Available-For-Sale Debt Securities Attributable To Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	4,000
Balance at end of period	6,000
Accumulated Other Comprehensive (Loss) Income Attributable To Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(128,722,000)	(103,568,000)
Balance at end of period	(126,719,000)	(74,950,000)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive income before reclassifications		28,218,000
Amounts reclassified to earnings		139,000
Total other comprehensive income	993,000	28,357,000
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Total other comprehensive income	2,000
AOCI Including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive income before reclassifications		28,218,000
Amounts reclassified to earnings		139,000
Total other comprehensive income	995,000	28,357,000
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Total other comprehensive income	1,008,000	261,000
Accumulated Net Investment Gain (Loss) Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Total other comprehensive income	0
AOCI Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Total other comprehensive income	$ 1,008,000	$ 261,000

EARNINGS PER SHARE - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator: Basic
Net earnings	$ 112,985	$ 87,839
Net earnings attributable to noncontrolling interests	(24,290)	(16,757)
Net earnings attributable to IAC shareholders	88,695	71,082
Numerator: Diluted
Net earnings	112,985	87,839
Net earnings attributable to noncontrolling interests	(24,290)	(16,757)
Impact from public subsidiaries' dilutive securities	(6,696)	(7,442)
Net earnings attributable to IAC shareholders	$ 81,999	$ 63,640
Denominator: Basic
Weighted average basic shares outstanding (shares)	83,905	82,983
Denominator: Diluted
Weighted average basic shares outstanding (shares)	83,905	82,983
Dilutive securities (shares)	6,435	6,086
Denominator for earnings per share - weighted average shares (shares)	90,340	89,069
Earnings per share attributable to IAC shareholders: Basic
Basic earnings per share (USD per share)	$ 1.06	$ 0.86
Earnings per share attributable to IAC shareholders: Diluted
Diluted earnings per share (USD per share)	0.91	$ 0.71
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	6,800
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)	300	200
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)	900

SEGMENT INFORMATION - Financial Data by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenue	$ 1,105,843	$ 995,075
Operating income (loss)	79,873	89,950
Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	464,625	407,367
Operating income (loss)	118,828	112,233
Adjusted EBITDA	155,067	137,741
Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	303,443	255,311
Operating income (loss)	(3,641)	(10,756)
Adjusted EBITDA	37,179	36,640
Operating segments \| Vimeo
Segment Reporting Information [Line Items]
Revenue	43,581	35,568
Operating income (loss)	(17,784)	(9,748)
Adjusted EBITDA	(16,200)	(7,784)
Operating segments \| Dotdash
Segment Reporting Information [Line Items]
Revenue	33,961	30,031
Operating income (loss)	3,047	3,191
Adjusted EBITDA	7,150	3,849
Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	143,549	131,987
Operating income (loss)	25,356	25,461
Adjusted EBITDA	29,688	26,752
Operating segments \| Emerging & Other
Segment Reporting Information [Line Items]
Revenue	116,748	134,885
Operating income (loss)	(2,520)	6,493
Adjusted EBITDA	(2,095)	8,208
Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenue	(64)	(74)
Corporate
Segment Reporting Information [Line Items]
Operating income (loss)	(43,413)	(36,924)
Adjusted EBITDA	$ (20,220)	$ (17,008)

SEGMENT INFORMATION - Revenue Disaggregated by Service (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenue	$ 1,105,843	$ 995,075
Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	464,625	407,367
Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	303,443	255,311
Operating segments \| Vimeo
Segment Reporting Information [Line Items]
Revenue	43,581	35,568
Operating segments \| Dotdash
Segment Reporting Information [Line Items]
Revenue	33,961	30,031
Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	143,549	131,987
Operating segments \| Emerging & Other
Segment Reporting Information [Line Items]
Revenue	116,748	134,885
North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	281,994	236,026
International
Segment Reporting Information [Line Items]
Revenue	393,462	337,495
Europe \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	21,449	19,285
Direct revenue \| Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	453,962	392,737
Direct revenue \| North America \| Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	237,773	211,357
Direct revenue \| International \| Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	216,189	181,380
Indirect revenue \| Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	10,663	14,630
Marketplace revenue \| North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	219,925	165,608
Consumer connection revenue \| North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	201,582	149,060
Membership subscription revenue \| North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	16,517	15,627
Other revenue \| North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	1,826	921
Consumer connection revenue \| Europe \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	17,123	14,367
Membership subscription revenue \| Europe \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	3,742	4,671
Advertising and other revenue \| North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	62,069	70,418
Advertising and other revenue \| Europe \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	584	247
Platform revenue \| Operating segments \| Vimeo
Segment Reporting Information [Line Items]
Revenue	41,302	32,932
Hardware revenue \| Operating segments \| Vimeo
Segment Reporting Information [Line Items]
Revenue	2,279	2,636
Advertising revenue \| Operating segments \| Dotdash
Segment Reporting Information [Line Items]
Revenue	28,919	25,744
Advertising revenue \| Operating segments \| Emerging & Other
Segment Reporting Information [Line Items]
Revenue	103,250	106,020
Google advertising revenue \| Operating segments \| Emerging & Other
Segment Reporting Information [Line Items]
Revenue	96,273	92,751
Other \| Operating segments \| Emerging & Other
Segment Reporting Information [Line Items]
Revenue	6,977	13,269
Affiliate commerce commission and other revenue \| Operating segments \| Dotdash
Segment Reporting Information [Line Items]
Revenue	5,042	4,287
Other revenue \| Operating segments \| Emerging & Other
Segment Reporting Information [Line Items]
Revenue	13,498	28,865
Desktop \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	95,986	117,588
Advertising revenue \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	91,398	110,272
Google advertising revenue \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	88,050	108,577
Other \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	3,348	1,695
Subscription and other revenue \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	4,588	7,316
Mosaic Group \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	47,563	14,399
Mosaic Group \| Advertising revenue \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	2,415	5,390
Mosaic Group \| Subscription and other revenue \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	$ 45,148	$ 9,009

SEGMENT INFORMATION - Geographic Information about Revenue and Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenue and long-lived assets by geography
Revenue	$ 1,105,843	$ 995,075
Property and equipment, net of accumulated depreciation and amortization	325,888		$ 318,800
United States
Revenue and long-lived assets by geography
Revenue	712,381	657,580
Property and equipment, net of accumulated depreciation and amortization	298,534		289,756
All other countries
Revenue and long-lived assets by geography
Revenue	393,462	$ 337,495
Property and equipment, net of accumulated depreciation and amortization	$ 27,354		$ 29,044

SEGMENT INFORMATION - Reconciliation of Operating Income (Loss) to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	$ 79,873	$ 89,950
Stock-based compensation expense	67,444	59,082
Depreciation	18,971	19,257
Amortization of intangibles	22,752	19,953
Interest expense	(31,143)	(26,505)
Other income (expense), net	651	(4,619)
Earnings before income taxes	49,381	58,826
Income tax benefit (provision)	63,604	29,013
Net earnings	112,985	87,839
Net earnings attributable to noncontrolling interests	(24,290)	(16,757)
Net earnings attributable to IAC shareholders	88,695	71,082
Operating segments \| Match Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	118,828	112,233
Stock-based compensation expense	27,997	16,963
Depreciation	7,831	8,147
Amortization of intangibles	411	242
Acquisition-related Contingent Consideration Fair Value Adjustments	0	156
Adjusted EBITDA	155,067	137,741
Operating segments \| ANGI Homeservices
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	(3,641)	(10,756)
Stock-based compensation expense	19,282	24,906
Depreciation	6,999	6,184
Amortization of intangibles	14,539	16,306
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0
Adjusted EBITDA	37,179	36,640
Operating segments \| Vimeo
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	(17,784)	(9,748)
Stock-based compensation expense	0	0
Depreciation	193	335
Amortization of intangibles	1,391	1,629
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0
Adjusted EBITDA	(16,200)	(7,784)
Operating segments \| Dotdash
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	3,047	3,191
Stock-based compensation expense	0	0
Depreciation	226	249
Amortization of intangibles	3,877	409
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0
Adjusted EBITDA	7,150	3,849
Operating segments \| Applications
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	25,356	25,461
Stock-based compensation expense	0	0
Depreciation	419	755
Amortization of intangibles	2,384	536
Acquisition-related Contingent Consideration Fair Value Adjustments	1,529	0
Adjusted EBITDA	29,688	26,752
Operating segments \| Emerging & Other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	(2,520)	6,493
Stock-based compensation expense	0	131
Depreciation	275	753
Amortization of intangibles	150	831
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0
Adjusted EBITDA	(2,095)	8,208
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	(43,413)	(36,924)
Stock-based compensation expense	20,165	17,082
Depreciation	3,028	2,834
Amortization of intangibles	0	0
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0
Adjusted EBITDA	$ (20,220)	$ (17,008)

CONSOLIDATED FINANCIAL STATEMENT DETAILS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest income	$ 12.4	$ 5.2
Gain (loss) on sale of business	(8.1)
Net foreign currency exchange gains (losses)	$ (1.9)	$ (7.9)

CONSOLIDATED FINANCIAL STATEMENT DETAILS - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 2,217,337	$ 2,131,632	$ 1,657,537	$ 1,630,809
Restricted cash included in other current assets	1,635	1,633	2,860	2,873
Restricted cash included in other assets	416	420	0	0
Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows	$ 2,219,388	$ 2,133,685	$ 1,660,397	$ 1,633,682

CONSOLIDATED FINANCIAL STATEMENT DETAILS - Other (Expense) Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other income (expense), net:
Other income (expense), net	$ 651	$ (4,619)

CONTINGENCIES - Narrative (Details)	Aug. 14, 2018 USD ($) plaintiff	Mar. 31, 2019 USD ($) lawsuit
Loss Contingencies [Line Items]
Loss contingency reserve		$ 0
Number of lawsuits with possible material impact (one or more) \| lawsuit		1
Tinder Optionholder Litigation
Loss Contingencies [Line Items]
Number of plaintiffs \| plaintiff	10
Tinder Optionholder Litigation \| Pending Litigation
Loss Contingencies [Line Items]
Damages sought	$ 2,000,000,000

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Narrative (Details)	Mar. 31, 2019
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	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 2,217,337	$ 2,131,632	$ 1,657,537	$ 1,630,809
Marketable securities	40,401	123,665
Accounts receivable, net of allowance and reserves	345,686	279,189
Other current assets	226,474	228,253
Intercompany receivables	0	0
Right of use assets	172,558	0
Property and equipment, net of accumulated depreciation and amortization	325,888	318,800
Goodwill	2,745,788	2,726,859
Intangible assets, net of accumulated amortization	608,109	631,422
Investment in subsidiaries	0	0
Other non-current assets	477,661	434,765
TOTAL ASSETS	7,159,902	6,874,585
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	13,750	13,750
Accounts payable, trade	83,535	74,907
Other current liabilities	810,535	794,901
Long-term debt, net	2,332,234	2,245,548
Income taxes payable	36,176	37,584
Intercompany liabilities	0	0
Other long-term liabilities	240,422	90,407
Redeemable noncontrolling interests	71,914	65,687
Shareholders' equity (deficit)	2,779,861	2,843,125
Noncontrolling interests	791,475	708,676
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	7,159,902	6,874,585
IAC
LIABILITIES AND SHAREHOLDERS' EQUITY
Long-term debt, net	488,914	484,666
Reportable Legal Entities \| IAC
ASSETS
Cash and cash equivalents	1,113,281	1,018,082
Marketable securities	39,954	98,299
Accounts receivable, net of allowance and reserves	0	0
Other current assets	27,074	39,449
Intercompany receivables	0	0
Right of use assets	561
Property and equipment, net of accumulated depreciation and amortization	6,598	6,526
Goodwill	0	0
Intangible assets, net of accumulated amortization	0	0
Investment in subsidiaries	1,753,945	1,897,699
Other non-current assets	285,842	274,789
TOTAL ASSETS	3,227,255	3,334,844
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	0	0
Accounts payable, trade	790	1,304
Other current liabilities	22,158	41,721
Long-term debt, net	34,277	34,262
Income taxes payable	0	15
Intercompany liabilities	389,873	414,156
Other long-term liabilities	296	261
Redeemable noncontrolling interests	0	0
Shareholders' equity (deficit)	2,779,861	2,843,125
Noncontrolling interests	0	0
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	3,227,255	3,334,844
Reportable Legal Entities \| Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	0	0
Marketable securities	0	0
Accounts receivable, net of allowance and reserves	89,587	99,970
Other current assets	32,254	29,222
Intercompany receivables	1,445,130	1,423,456
Right of use assets	41,185
Property and equipment, net of accumulated depreciation and amortization	160,419	163,281
Goodwill	412,009	412,009
Intangible assets, net of accumulated amortization	40,037	43,914
Investment in subsidiaries	231,897	214,519
Other non-current assets	94,691	94,290
TOTAL ASSETS	2,547,209	2,480,661
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	0	0
Accounts payable, trade	33,600	36,293
Other current liabilities	83,816	95,405
Long-term debt, net	0	0
Income taxes payable	1,660	1,707
Intercompany liabilities	0	0
Other long-term liabilities	55,644	18,181
Redeemable noncontrolling interests	0	0
Shareholders' equity (deficit)	2,372,489	2,329,075
Noncontrolling interests	0	0
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	2,547,209	2,480,661
Reportable Legal Entities \| Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	1,104,056	1,113,550
Marketable securities	447	25,366
Accounts receivable, net of allowance and reserves	256,099	179,219
Other current assets	167,891	171,682
Intercompany receivables	0	0
Right of use assets	147,816
Property and equipment, net of accumulated depreciation and amortization	158,871	148,993
Goodwill	2,333,779	2,314,850
Intangible assets, net of accumulated amortization	568,072	587,508
Investment in subsidiaries	0	0
Other non-current assets	233,400	251,315
TOTAL ASSETS	4,970,431	4,792,483
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	13,750	13,750
Accounts payable, trade	49,145	37,310
Other current liabilities	709,213	669,875
Long-term debt, net	2,297,957	2,211,286
Income taxes payable	34,516	35,862
Intercompany liabilities	1,055,257	1,009,300
Other long-term liabilities	333,851	257,594
Redeemable noncontrolling interests	71,914	65,687
Shareholders' equity (deficit)	(386,647)	(216,857)
Noncontrolling interests	791,475	708,676
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	4,970,431	4,792,483
Eliminations
ASSETS
Cash and cash equivalents	0	0
Marketable securities	0	0
Accounts receivable, net of allowance and reserves	0	0
Other current assets	(745)	(12,100)
Intercompany receivables	(1,445,130)	(1,423,456)
Right of use assets	(17,004)
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	(1,985,842)	(2,112,218)
Other non-current assets	(136,272)	(185,629)
TOTAL ASSETS	(3,584,993)	(3,733,403)
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	0	0
Accounts payable, trade	0	0
Other current liabilities	(4,652)	(12,100)
Long-term debt, net	0	0
Income taxes payable	0	0
Intercompany liabilities	(1,445,130)	(1,423,456)
Other long-term liabilities	(149,369)	(185,629)
Redeemable noncontrolling interests	0	0
Shareholders' equity (deficit)	(1,985,842)	(2,112,218)
Noncontrolling interests	0	0
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ (3,584,993)	$ (3,733,403)

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Revenue	$ 1,105,843	$ 995,075
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	260,071	201,962
Selling and marketing expense	421,860	402,832
General and administrative expense	213,616	184,184
Product development expense	88,700	76,937
Depreciation	18,971	19,257
Amortization of intangibles	22,752	19,953
Total operating costs and expenses	1,025,970	905,125
Operating income	79,873	89,950
Equity in earnings of unconsolidated affiliates	0	0
Interest expense	(31,143)	(26,505)
Other (expense) income, net	651	(4,619)
Earnings before income taxes	49,381	58,826
Income tax benefit (provision)	63,604	29,013
Net earnings	112,985	87,839
Net earnings attributable to noncontrolling interests	(24,290)	(16,757)
Net earnings attributable to IAC shareholders	88,695	71,082
Comprehensive income (loss) attributable to IAC shareholders	89,690	99,439
Foreign earnings repatriated		276,000
Reportable Legal Entities \| IAC
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	24	76
Selling and marketing expense	362	213
General and administrative expense	38,259	31,409
Product development expense	647	652
Depreciation	378	266
Amortization of intangibles	0	0
Total operating costs and expenses	39,670	32,616
Operating income	(39,670)	(32,616)
Equity in earnings of unconsolidated affiliates	115,440	102,750
Interest expense	(424)	(429)
Other (expense) income, net	(1,897)	(16,847)
Earnings before income taxes	73,449	52,858
Income tax benefit (provision)	15,246	18,224
Net earnings	88,695	71,082
Net earnings attributable to noncontrolling interests	0	0
Net earnings attributable to IAC shareholders	88,695	71,082
Comprehensive income (loss) attributable to IAC shareholders	89,690	99,439
Reportable Legal Entities \| Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue	198,930	212,889
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	82,146	56,224
Selling and marketing expense	57,966	90,138
General and administrative expense	10,534	15,381
Product development expense	12,037	14,269
Depreciation	2,922	3,340
Amortization of intangibles	3,877	509
Total operating costs and expenses	169,482	179,861
Operating income	29,448	33,028
Equity in earnings of unconsolidated affiliates	1,068	(327)
Interest expense	0	0
Other (expense) income, net	13,851	286,883
Earnings before income taxes	44,367	319,584
Income tax benefit (provision)	(5,123)	(10,966)
Net earnings	39,244	308,618
Net earnings attributable to noncontrolling interests	0	0
Net earnings attributable to IAC shareholders	39,244	308,618
Comprehensive income (loss) attributable to IAC shareholders	39,455	308,961
Reportable Legal Entities \| Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue	906,978	782,260
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	177,966	145,712
Selling and marketing expense	363,562	312,526
General and administrative expense	164,793	137,373
Product development expense	76,016	62,016
Depreciation	15,671	15,651
Amortization of intangibles	18,875	19,444
Total operating costs and expenses	816,883	692,722
Operating income	90,095	89,538
Equity in earnings of unconsolidated affiliates	0	0
Interest expense	(30,719)	(26,076)
Other (expense) income, net	420	2,190
Earnings before income taxes	59,796	65,652
Income tax benefit (provision)	53,481	21,755
Net earnings	113,277	87,407
Net earnings attributable to noncontrolling interests	(24,290)	(16,757)
Net earnings attributable to IAC shareholders	88,987	70,650
Comprehensive income (loss) attributable to IAC shareholders	90,100	105,327
Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenue	(65)	(74)
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	(65)	(50)
Selling and marketing expense	(30)	(45)
General and administrative expense	30	21
Product development expense	0	0
Depreciation	0	0
Amortization of intangibles	0	0
Total operating costs and expenses	(65)	(74)
Operating income	0	0
Equity in earnings of unconsolidated affiliates	(116,508)	(102,423)
Interest expense	0	0
Other (expense) income, net	(11,723)	(276,845)
Earnings before income taxes	(128,231)	(379,268)
Income tax benefit (provision)	0	0
Net earnings	(128,231)	(379,268)
Net earnings attributable to noncontrolling interests	0	0
Net earnings attributable to IAC shareholders	(128,231)	(379,268)
Comprehensive income (loss) attributable to IAC shareholders	$ (129,555)	$ (414,288)

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ 102,941	$ 152,008
Cash flows from investing activities:
Acquisitions, net of cash acquired	(21,555)	(21,295)
Capital expenditures	(25,855)	(14,801)
Proceeds from maturities of marketable debt securities	123,500	5,000
Purchases of marketable debt securities	(39,740)	(4,975)
Net proceeds from the sale of businesses and investments	20,472	15
Purchases of investments	0	(18,180)
Other, net	(1,215)	9,347
Net cash provided by (used in) investing activities	55,607	(44,889)
Cash flows from financing activities:
Debt issuance costs	(5,542)	(193)
Purchase of noncontrolling interests	(3,182)	(234)
Distribution to IAC pursuant to the ANGI tax sharing agreement	0
Acquisition-related contingent consideration payments	0	(185)
Intercompany	0	0
Other, net	27	2,669
Net cash used in financing activities	(73,660)	(83,150)
Total cash provided	84,888	23,969
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	815	2,746
Net increase in cash, cash equivalents, and restricted cash	85,703	26,715
Cash, cash equivalents, and restricted cash at beginning of period	2,133,685	1,633,682
Cash, cash equivalents, and restricted cash at end of period	2,219,388	1,660,397
Reportable Legal Entities \| IAC
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(40,242)	1,562
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	(4,134)
Capital expenditures	(531)	0
Proceeds from maturities of marketable debt securities	98,500	5,000
Purchases of marketable debt securities	(39,740)	(4,975)
Net proceeds from the sale of businesses and investments	0	0
Purchases of investments		(18,180)
Other, net	0	(5,000)
Net cash provided by (used in) investing activities	58,229	(27,289)
Cash flows from financing activities:
Purchase of noncontrolling interests	(3,182)	0
Distribution to IAC pursuant to the ANGI tax sharing agreement	11,355
Acquisition-related contingent consideration payments		0
Intercompany	73,803	308,822
Other, net		2,674
Net cash used in financing activities	77,212	335,468
Total cash provided	95,199	309,741
Effect of exchange rate changes on cash, cash equivalents, and restricted cash		26
Net increase in cash, cash equivalents, and restricted cash	95,199	309,767
Cash, cash equivalents, and restricted cash at beginning of period	1,018,082	585,639
Cash, cash equivalents, and restricted cash at end of period	1,113,281	895,406
Reportable Legal Entities \| Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	40,574	319,686
Cash flows from investing activities:
Acquisitions, net of cash acquired	(1,214)	0
Capital expenditures	(39)	(570)
Proceeds from maturities of marketable debt securities	0	0
Purchases of marketable debt securities	0	0
Net proceeds from the sale of businesses and investments	39	0
Purchases of investments		0
Other, net	(2,034)	3,884
Net cash provided by (used in) investing activities	(3,248)	3,314
Cash flows from financing activities:
Purchase of noncontrolling interests	0	0
Distribution to IAC pursuant to the ANGI tax sharing agreement	0
Acquisition-related contingent consideration payments		0
Intercompany	(37,326)	(323,000)
Net cash used in financing activities	(37,326)	(323,000)
Net increase in cash, cash equivalents, and restricted cash	0	0
Cash, cash equivalents, and restricted cash at end of period	0	0
Reportable Legal Entities \| Non-Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	114,332	107,605
Cash flows from investing activities:
Acquisitions, net of cash acquired	(20,341)	(17,161)
Capital expenditures	(25,285)	(14,231)
Proceeds from maturities of marketable debt securities	25,000	0
Purchases of marketable debt securities	0	0
Net proceeds from the sale of businesses and investments	20,433	15
Purchases of investments		0
Other, net	819	10,463
Net cash provided by (used in) investing activities	626	(20,914)
Cash flows from financing activities:
Debt issuance costs	(5,542)
Purchase of noncontrolling interests	0	(234)
Distribution to IAC pursuant to the ANGI tax sharing agreement	(11,355)
Acquisition-related contingent consideration payments		(185)
Intercompany	(48,200)	(262,667)
Other, net	27	(5)
Net cash used in financing activities	(125,269)	(372,463)
Total cash provided	(10,311)	(285,772)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	815	2,720
Net increase in cash, cash equivalents, and restricted cash	(9,496)	(283,052)
Cash, cash equivalents, and restricted cash at beginning of period	1,115,603	1,048,043
Cash, cash equivalents, and restricted cash at end of period	1,106,107	764,991
Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(11,723)	(276,845)
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	0
Capital expenditures	0	0
Proceeds from maturities of marketable debt securities	0	0
Purchases of marketable debt securities	0	0
Net proceeds from the sale of businesses and investments	0	0
Purchases of investments		0
Other, net	0	0
Net cash provided by (used in) investing activities	0	0
Cash flows from financing activities:
Purchase of noncontrolling interests	0	0
Distribution to IAC pursuant to the ANGI tax sharing agreement	0
Acquisition-related contingent consideration payments		0
Intercompany	11,723	276,845
Net cash used in financing activities	11,723	276,845
Net increase in cash, cash equivalents, and restricted cash	0	0
Cash, cash equivalents, and restricted cash at end of period	0	0
IAC/InterActiveCorp
Cash flows from financing activities:
Proceeds from the exercise of stock options	9,298	24,254
Withholding taxes paid on behalf of employees on net settled stock-based awards	(14,062)	(282)
IAC/InterActiveCorp \| Reportable Legal Entities \| IAC
Cash flows from financing activities:
Proceeds from the exercise of stock options	9,298	24,254
Withholding taxes paid on behalf of employees on net settled stock-based awards	(14,062)	(282)
IAC/InterActiveCorp \| Reportable Legal Entities \| Guarantor Subsidiaries
Cash flows from financing activities:
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:
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:
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	573	1,752
Withholding taxes paid on behalf of employees on net settled stock-based awards	(123,148)	(75,028)
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	0
Match Group and ANGI Homeservices \| Reportable Legal Entities \| Guarantor Subsidiaries
Cash flows from financing activities:
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 \| Reportable Legal Entities \| Non-Guarantor Subsidiaries
Cash flows from financing activities:
Proceeds from the exercise of stock options	573	1,752
Withholding taxes paid on behalf of employees on net settled stock-based awards	(123,148)	(75,028)
Match Group and ANGI Homeservices \| Eliminations
Cash flows from financing activities:
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
Cash flows from financing activities:
Borrowings under Match Group Credit Facility	40,000	0
Proceeds from Match Group 2019 Senior Notes offering	350,000	0
Principal payments on debt	(300,000)	0
Purchase of Match Group treasury stock	(24,186)	(32,465)
Match Group \| Reportable Legal Entities \| IAC
Cash flows from financing activities:
Borrowings under Match Group Credit Facility	0
Proceeds from Match Group 2019 Senior Notes offering	0
Principal payments on debt	0
Match Group \| Reportable Legal Entities \| Guarantor Subsidiaries
Cash flows from financing activities:
Borrowings under Match Group Credit Facility	0
Proceeds from Match Group 2019 Senior Notes offering	0
Principal payments on debt	0
Match Group \| Reportable Legal Entities \| Non-Guarantor Subsidiaries
Cash flows from financing activities:
Borrowings under Match Group Credit Facility	40,000
Proceeds from Match Group 2019 Senior Notes offering	350,000
Principal payments on debt	(300,000)
Purchase of Match Group treasury stock	(24,186)	(32,465)
Match Group \| Eliminations
Cash flows from financing activities:
Borrowings under Match Group Credit Facility	0
Proceeds from Match Group 2019 Senior Notes offering	0
Principal payments on debt	0
ANGI Homeservices
Cash flows from financing activities:
Principal payments on debt	(3,438)	(3,438)
Debt issuance costs		(193)
ANGI Homeservices \| Reportable Legal Entities \| IAC
Cash flows from financing activities:
Principal payments on debt	0	0
Debt issuance costs		0
ANGI Homeservices \| Reportable Legal Entities \| Guarantor Subsidiaries
Cash flows from financing activities:
Principal payments on debt	0	0
Debt issuance costs		0
ANGI Homeservices \| Reportable Legal Entities \| Non-Guarantor Subsidiaries
Cash flows from financing activities:
Principal payments on debt	(3,438)	(3,438)
Debt issuance costs		(193)
ANGI Homeservices \| Eliminations
Cash flows from financing activities:
Principal payments on debt	$ 0	0
Debt issuance costs		$ 0

Label	Element	Value
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 40,205,000
Noncontrolling Interest [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	3,410,000
Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	36,795,000
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 36,795,000