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Cover Page - shares	6 Months Ended
Cover Page - shares	Jun. 30, 2019	Aug. 02, 2019
Document Information [Line Items]
Entity Central Index Key	0000891103
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	0-20570
Entity Registrant Name	IAC/INTERACTIVECORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	59-2712887
Entity Address, Address Line One	555 West 18th Street
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10011
City Area Code	212
Local Phone Number	314-7300
Title of 12(b) Security	Common Stock, par value $0.001
Trading Symbol	IAC
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		78,509,401
Class B Convertible Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		5,789,499

CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 3,151,959	$ 2,131,632
Marketable securities	161,749	123,665
Accounts receivable, net of allowance and reserves of $24,699 and $18,860, respectively	365,495	279,189
Other current assets	234,884	228,253
Total current assets	3,914,087	2,762,739
Right-of-use assets	180,290	0
Property and equipment, net of accumulated depreciation and amortization of $298,113 and $286,798, respectively	361,550	318,800
Goodwill	2,892,962	2,726,859
Intangible assets, net of accumulated amortization of $175,570 and $136,405, respectively	628,418	631,422
Long-term investments	101,958	235,055
Deferred income taxes	115,988	64,786
Other non-current assets	103,852	134,924
TOTAL ASSETS	8,299,105	6,874,585
LIABILITIES:
Current portion of long-term debt	13,750	13,750
Accounts payable, trade	104,392	74,907
Deferred revenue	402,218	360,015
Accrued expenses and other current liabilities	433,102	434,886
Total current liabilities	953,462	883,558
Long-term debt, net	3,138,531	2,245,548
Income taxes payable	36,533	37,584
Deferred income taxes	23,010	23,600
Other long-term liabilities	223,470	66,807
Redeemable noncontrolling interests	80,502	65,687
Commitments and contingencies
SHAREHOLDERS' EQUITY:
Additional paid-in capital	11,957,543	12,022,387
Retained earnings	1,460,956	1,258,794
Accumulated other comprehensive loss	(125,705)	(128,722)
Treasury stock 194,708 shares	(10,309,612)	(10,309,612)
Total IAC shareholders' equity	2,983,461	2,843,125
Noncontrolling interests	860,136	708,676
Total shareholders' equity	3,843,597	3,551,801
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	8,299,105	6,874,585
Common stock $.001 par value; authorized 1,600,000 shares; issued 262,789 and 262,303 shares, respectively, and outstanding 78,449 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	Jun. 30, 2019	Dec. 31, 2018
Allowance for accounts receivable	$ 24,699	$ 18,860
Accumulated depreciation and amortization of property and equipment	298,113	286,798
Accumulated amortization of intangible assets	$ 175,570	$ 136,405
Treasury stock (shares)	194,708,000	194,708,000
Common stock $.001 par value; authorized 1,600,000 shares; issued 262,789 and 262,303 shares, respectively, and outstanding 78,449 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)	262,789,000	262,303,000
Common stock outstanding (shares)	78,449,000	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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue	$ 1,186,658	$ 1,059,122	$ 2,292,501	$ 2,054,197
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	276,389	218,224	536,460	420,186
Selling and marketing expense	411,102	369,660	832,962	772,492
General and administrative expense	225,514	188,363	439,130	372,547
Product development expense	78,614	75,445	167,314	152,382
Depreciation	21,091	18,805	40,062	38,062
Amortization of intangibles	19,638	20,188	42,390	40,141
Total operating costs and expenses	1,032,348	890,685	2,058,318	1,795,810
Operating income	154,310	168,437	234,183	258,387
Interest expense	(37,206)	(27,356)	(68,349)	(53,861)
Other income, net	45,972	171,141	46,623	166,522
Earnings before income taxes	163,076	312,222	212,457	371,048
Income tax (provision) benefit	(16,285)	(31,368)	47,319	(2,355)
Net earnings	146,791	280,854	259,776	368,693
Net earnings attributable to noncontrolling interests	(33,324)	(62,501)	(57,614)	(79,258)
Net earnings attributable to IAC shareholders	$ 113,467	$ 218,353	$ 202,162	$ 289,435
Earnings per share attributable to IAC shareholders:
Basic earnings per share (USD per share)	$ 1.35	$ 2.61	$ 2.41	$ 3.47
Diluted earnings per share (USD per share)	$ 1.19	$ 2.32	$ 2.10	$ 3.05
Stock-based compensation expense by function:
Stock-based compensation expense	$ 62,425	$ 57,561	$ 129,869	$ 116,643
Cost of revenue
Stock-based compensation expense by function:
Stock-based compensation expense	695	715	1,984	1,425
Selling and marketing expense
Stock-based compensation expense by function:
Stock-based compensation expense	2,760	2,077	5,477	3,842
General and administrative expense
Stock-based compensation expense by function:
Stock-based compensation expense	49,949	44,875	94,959	90,501
Product development expense
Stock-based compensation expense by function:
Stock-based compensation expense	$ 9,021	$ 9,894	$ 27,449	$ 20,875

CONSOLIDATED STATEMENT OF COMPREHENSIVE OPERATIONS - USD ($)
$ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

Statement of Comprehensive Income [Abstract]

Net earnings

$ 146,791

$ 280,854

$ 259,776

$ 368,693

Other comprehensive income (loss), net of income taxes:

Change in foreign currency translation adjustment

1,097

(46,576)

2,406

(11,183)

Change in unrealized gains and losses of available-for-sale debt securities

^[1]

(6)

(5)

Total other comprehensive income (loss), net of income taxes

1,091

(46,563)

2,401

(11,170)

Comprehensive income, net of income taxes

147,882

234,291

262,177

357,523

Components of comprehensive income attributable to noncontrolling interests:

Net earnings attributable to noncontrolling interests

(33,324)

(62,501)

(57,614)

(79,258)

Change in foreign currency translation adjustment attributable to noncontrolling interests

9,119

(316)

2,083

Change in unrealized gains and losses of available-for-sale debt securities attributable to noncontrolling interests

Comprehensive income attributable to noncontrolling interests

(33,324)

(53,382)

(57,929)

(77,175)

Comprehensive income attributable to IAC shareholders

$ 114,558

$ 180,909

$ 204,248

$ 280,348

[1]	Net of income tax provision of $4 for both the three and six months ended June 30, 2018.

CONSOLIDATED STATEMENT OF COMPREHENSIVE OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Tax provision related to change in unrealized gains and losses of available-for-sale debt securities	$ 4	$ 4

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 earnings		34,756
Other comprehensive (loss) income, net of income taxes		(286)
Stock-based compensation expense		800
Purchase of redeemable noncontrolling interests		(59)
Adjustment of redeemable noncontrolling interests to fair value		1,849
Noncontrolling interests created in acquisitions	$ 14,246	2,261								$ 14,246
Other		(6,469)
Balance at end of period at Jun. 30, 2018		75,719
Balance at beginning of period at Dec. 31, 2017	2,946,823		$ 2,430,028	$ 261	$ 16	$ 12,165,002	$ 595,038	$ (103,568)	$ (10,226,721)	516,795
Balance at beginning of period (shares) at Dec. 31, 2017				260,624,000	16,157,000
Increase (Decrease) in Shareholders' Equity
Net earnings	333,937		289,435				289,435			44,502
Other comprehensive (loss) income, net of income taxes	(10,884)		(9,087)					(9,087)		(1,797)
Stock-based compensation expense	115,843		36,015			36,015				79,828
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	25,891		25,891	$ 1		25,890
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares)				1,133,000
Purchase of treasury stock	(14,713)		(14,713)						(14,713)
Purchase of redeemable noncontrolling interests	(818)									(818)
Adjustment of redeemable noncontrolling interests to fair value	(1,849)		(1,849)			(1,849)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests											$ (195,094)	$ (194,809)	$ (194,764)	$ (45)	$ (285)	$ (19,290)	$ (24,019)	$ (24,002)	$ (17)	$ 4,729
Noncontrolling interests created in acquisitions	14,246	2,261								14,246
Other	2,651		2,392			2,392				259
Balance at end of period at Jun. 30, 2018	3,236,948		2,576,079	$ 262	$ 16	12,008,684	921,268	(112,717)	(10,241,434)	660,869
Balance at end of period (shares) at Jun. 30, 2018				261,757,000	16,157,000
Balance at beginning of period at Mar. 31, 2018		47,099
Increase (Decrease) in Redeemable Noncontrolling Interests
Net earnings		35,715
Other comprehensive (loss) income, net of income taxes		(865)
Stock-based compensation expense		390
Purchase of redeemable noncontrolling interests		(59)
Adjustment of redeemable noncontrolling interests to fair value		(1,554)
Noncontrolling interests created in acquisitions	14,246	1,474								14,246
Other		(6,481)
Balance at end of period at Jun. 30, 2018		75,719
Balance at beginning 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 beginning of period (shares) at Mar. 31, 2018				261,396,000	16,157,000
Increase (Decrease) in Shareholders' Equity
Net earnings	245,139		218,353				218,353			26,786
Other comprehensive (loss) income, net of income taxes	(45,698)		(37,444)					(37,444)		(8,254)
Stock-based compensation expense	57,171		18,801			18,801				38,370
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	616		616	$ 1		615
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares)				361,000
Purchase of treasury stock	(14,713)		(14,713)						(14,713)
Purchase of redeemable noncontrolling interests	(549)									(549)
Adjustment of redeemable noncontrolling interests to fair value	1,554		1,554			1,554
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests											(85,051)	(83,352)	(83,043)	(309)	(1,699)	(18,147)	(22,078)	(22,064)	(14)	3,931
Noncontrolling interests created in acquisitions	14,246	1,474								14,246
Other	(11)		(185)			(185)				174
Balance at end of period at Jun. 30, 2018	3,236,948		2,576,079	$ 262	$ 16	12,008,684	921,268	(112,717)	(10,241,434)	660,869
Balance at end of period (shares) at Jun. 30, 2018				261,757,000	16,157,000
Balance at beginning of period at Dec. 31, 2018	65,687	65,687
Increase (Decrease) in Redeemable Noncontrolling Interests
Net earnings		5,895
Other comprehensive (loss) income, net of income taxes		(149)
Stock-based compensation expense		77
Purchase of redeemable noncontrolling interests		(6,121)
Adjustment of redeemable noncontrolling interests to fair value		10,138
Noncontrolling interests created in acquisitions	0	5,009	0			0				0
Other		(34)
Balance at end of period at Jun. 30, 2019	80,502	80,502
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 earnings	253,881		202,162				202,162			51,719
Other comprehensive (loss) income, net of income taxes	2,550		2,086					2,086		464
Stock-based compensation expense	129,786		43,055			43,055				86,731
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	(23,022)		(23,022)	$ 1		(23,023)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares)				486,000
Purchase of redeemable noncontrolling interests	0									0
Adjustment of redeemable noncontrolling interests to fair value	(10,138)		(10,138)			(10,138)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests											(219,227)	(220,108)	(221,030)	922	881	(26,238)	(37,730)	(37,739)	9	11,492
Noncontrolling interests created in acquisitions	0	5,009	0			0				0
Purchase of exchangeable note hedges	(303,428)		(303,428)			(303,428)
Equity component of exchangeable senior notes, net of deferred financing costs and deferred tax liabilities	321,128		321,128			321,128
Issuance of warrants	166,520		166,520			166,520
Other	(16)		(189)			(189)				173
Balance at end of period at Jun. 30, 2019	3,843,597		2,983,461	$ 263	$ 16	11,957,543	1,460,956	(125,705)	(10,309,612)	860,136
Balance at end of period (shares) at Jun. 30, 2019				262,789,000	16,157,000
Balance at beginning of period at Mar. 31, 2019		71,914
Increase (Decrease) in Redeemable Noncontrolling Interests
Net earnings		6,946
Other comprehensive (loss) income, net of income taxes		(335)
Stock-based compensation expense		35
Purchase of redeemable noncontrolling interests		(2,939)
Adjustment of redeemable noncontrolling interests to fair value		(104)
Noncontrolling interests created in acquisitions		5,009
Other		(24)
Balance at end of period at Jun. 30, 2019	80,502	80,502
Balance at beginning 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 beginning of period (shares) at Mar. 31, 2019				262,629,000	16,157,000
Increase (Decrease) in Shareholders' Equity
Net earnings	139,845		113,467				113,467			26,378
Other comprehensive (loss) income, net of income taxes	1,426		1,091					1,091		335
Stock-based compensation expense	62,384		22,890			22,890				39,494
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	(18,112)		(18,112)	$ 0		(18,112)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares)				160,000
Purchase of redeemable noncontrolling interests	0									0
Adjustment of redeemable noncontrolling interests to fair value	104		104			104
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests											$ (87,351)	$ (87,248)	$ (87,169)	$ (79)	$ (103)	$ (10,256)	$ (12,640)	$ (12,642)	$ 2	$ 2,384
Noncontrolling interests created in acquisitions		$ 5,009
Purchase of exchangeable note hedges	(303,428)		(303,428)			(303,428)
Equity component of exchangeable senior notes, net of deferred financing costs and deferred tax liabilities	321,128		321,128			321,128
Issuance of warrants	166,520		166,520			166,520
Other	1		(172)			(172)				173
Balance at end of period at Jun. 30, 2019	$ 3,843,597		$ 2,983,461	$ 263	$ 16	$ 11,957,543	$ 1,460,956	$ (125,705)	$ (10,309,612)	$ 860,136
Balance at end of period (shares) at Jun. 30, 2019				262,789,000	16,157,000

CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Parenthetical)	Jun. 30, 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	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net earnings	$ 259,776	$ 368,693
Adjustments to reconcile net earnings to net cash provided by operating activities:
Stock-based compensation expense	129,869	116,643
Amortization of intangibles	42,390	40,141
Depreciation	40,062	38,062
Bad debt expense	33,408	20,865
Deferred income taxes	(57,169)	(11,258)
Unrealized gains on equity securities, net	(29,247)	(126,559)
Losses (gains) from the sale of investments and businesses, net	6,242	(27,172)
Other adjustments, net	20,175	8,591
Changes in assets and liabilities, net of effects of acquisitions and dispositions:
Accounts receivable	(124,957)	(60,185)
Other assets	3,482	(38,195)
Accounts payable and other liabilities	(1,764)	1,063
Income taxes payable and receivable	(7,956)	3,467
Deferred revenue	41,497	45,646
Net cash provided by operating activities	355,808	379,802
Cash flows from investing activities:
Acquisitions, net of cash acquired	(201,026)	(17,513)
Capital expenditures	(76,623)	(39,696)
Proceeds from maturities of marketable debt securities	163,500	10,000
Purchases of marketable debt securities	(39,740)	(124,397)
Net proceeds from the sale of businesses and investments	23,373	27,540
Purchases of investments	0	(31,180)
Other, net	(2,156)	9,599
Net cash used in investing activities	(132,672)	(165,647)
Cash flows from financing activities:
Purchase of exchangeable note hedges	(303,428)	0
Proceeds from issuance of warrants	166,520	0
Debt issuance costs	(26,361)	(532)
Purchase of noncontrolling interests	(6,121)	(877)
Other, net	(3,719)	(4,829)
Net cash provided by (used in) financing activities	796,771	(202,705)
Total cash provided	1,019,907	11,450
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	361	44
Net increase in cash, cash equivalents, and restricted cash	1,020,268	11,494
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	3,153,953	1,645,176
Match Group and ANGI Homeservices
Cash flows from financing activities:
Proceeds from the exercise of stock options	573	2,125
Withholding taxes paid on behalf of employees on net settled stock-based awards	(164,710)	(136,727)
ANGI Homeservices
Cash flows from financing activities:
Principal payments on debt	(6,875)	(6,875)
Match Group
Cash flows from financing activities:
Proceeds from issuance of debt	40,000	0
Purchase of exchangeable note hedges	(303,428)
Proceeds from issuance of warrants	166,520
Proceeds from Match Group 2019 Senior Notes offering	350,000	0
Principal payments on debt	(300,000)	0
Purchase of Match Group treasury stock	(76,086)	(73,943)
IAC/InterActiveCorp
Cash flows from financing activities:
Proceeds from issuance of debt	1,150,000	0
Purchase of Match Group treasury stock		(7,869)
Proceeds from the exercise of stock options	9,767	27,317
Withholding taxes paid on behalf of employees on net settled stock-based awards	$ (32,789)	$ (495)

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

6 Months Ended

Jun. 30, 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, OkCupid and Hinge, 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 June 30, 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 83.1%, 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 securities of the same issuer; value is generally determined based on a market approach as of the transaction date. A security will be considered identical or similar if it has identical or similar rights to the equity securities held by the Company. The Company reviews its investments in equity securities without readily determinable fair values 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 investments in equity securities, which require judgment and the use of estimates. When our assessment indicates that the fair value of the investment is below its carrying value, the Company writes down the investment 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 June 30, 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: the fair values of cash equivalents and marketable debt securities; the carrying value of accounts receivable, including the determination of the allowance for doubtful accounts; the determination of revenue reserves; the useful lives and recoverability of definite-lived intangible assets and property and equipment; the recoverability of goodwill and indefinite-lived intangible assets; the fair value of equity securities without readily determinable fair values; contingencies; 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.

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 8—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 six months ended June 30, 2019, the Company recognized $315.0 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 June 30, 2019 are $402.2 million and $1.4 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 $40.8 million and $40.5 million at June 30, 2019 and December 31, 2018, respectively.

Certain Risks and Concentrations—Services Agreement with Google

A meaningful portion of the Company's revenue is attributable to a services agreement with Google (the "Services Agreement"). In addition, the Company earns certain other advertising revenue from Google that is not attributable to the Services Agreement. For the three and six months ended June 30, 2019, consolidated revenue earned from Google was $196.4 million and $392.3 million, respectively, both representing 17%, of the Company's consolidated revenue. For the three and six months ended June 30, 2018, consolidated revenue earned from Google was $204.9 million and $416.2 million, representing 19% and 20%, respectively, of the Company's consolidated revenue. Accounts receivable related to revenue earned from Google totaled $73.2 million and $69.1 million at June 30, 2019 and December 31, 2018, respectively.

Revenue attributable to the Services Agreement is earned by the Desktop business within the Applications segment and the Ask Media Group within the Emerging & Other segment. For the three and six months ended June 30, 2019, revenue from the Services Agreement of $78.1 million and $166.1 million, respectively, was earned within the Applications segment and $104.0 million and $198.2 million, respectively, within the Emerging & Other segment. For the three and six months ended June 30, 2018, revenue from the Services Agreement of $107.4 million and $215.9 million, respectively, was earned within the Applications segment and $82.6 million and $168.4 million, respectively, within the Emerging & Other segment.

The current Services Agreement expires on March 31, 2020. 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. The Company believes that the amended agreement, taken as a whole, is comparable to the Company’s currently existing agreement with Google. 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. These updates may be specific to the Services Agreement or could be more general and thereby impact the Company as well as other companies. These policy and guideline updates 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 May 31, 2019, Google announced policy changes, which became effective on July 1, 2019, related to all extensions distributed through the Chrome Web Store, including the Company's. These policy changes could negatively impact the distribution of our desktop products through the Chrome Web Store and, thereby, reduce the revenue and profits of the Desktop business within our Applications segment, which could in turn reduce the fair value of the Desktop reporting unit and the related intangible asset. A reduction in the fair value of the Desktop reporting unit of approximately 10% would result in an impairment of goodwill equal to the excess of the carrying value over the fair value. Any reduction in the fair value of the related intangible asset would result in an impairment equal to such reduction. As of June 30, 2019, the goodwill balance of the Desktop reporting unit and the carrying value of the related intangible asset are $265.1 million and $28.9 million, respectively.

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.

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 2—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.

LEASES LEASES

6 Months Ended

Jun. 30, 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.

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 these 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(s). Lease expense is recognized on a straight-line basis over the term of the lease. As permitted by ASC 842, leases with an initial term of twelve months or less ("short-term leases") are not recorded on the accompanying consolidated balance sheet.

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	June 30, 2019
		(In thousands)
Assets:
Right-of-use assets	Right-of-use assets	$	180,290

Liabilities:
Current lease liabilities	Accrued expenses and other current liabilities	32,635
Long-term lease liabilities	Other long-term liabilities	201,708
Total lease liabilities		$	234,343



Lease Cost	Income Statement Classification	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
		(In thousands)
Fixed lease cost	Cost of revenue	$	1,131	$	2,206
Fixed lease cost	Selling and marketing expense	3,002		4,911
Fixed lease cost	General and administrative expense	9,400		16,590
Fixed lease cost	Product development expense	282		600
Total fixed lease cost ^(a)		13,815		24,307
Variable lease cost	Cost of revenue	107		264
Variable lease cost	Selling and marketing expense	366		670
Variable lease cost	General and administrative expense	1,884		3,688
Variable lease cost	Product development expense	45		99
Total variable lease cost		2,402		4,721
Net lease cost		$	16,217	$	29,028

_____________________

^(a)Includes approximately $1.7 million and $3.0 million of short-term lease cost and $0.5 million and $1.1 million of sublease income for the three and six months ended June 30, 2019, respectively.

Maturities of lease liabilities as of June 30, 2019 (in thousands)^(b):



Remainder of 2019	$	20,503
2020	45,081
2021	38,724
2022	31,829
2023	28,491
After 2023	249,573
Total	414,201
Less: Interest	179,858
Present value of lease liabilities	$	234,343

_____________________


^(b)	Lease payments exclude $1.1 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 as of June 30, 2019:



Remaining lease term	15.9 years
Discount rate	6.03	%



	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
	(In thousands)
Other Information:
Right-of-use assets obtained in exchange for lease liabilities	$	24,888	$	53,158
Cash paid for amounts included in the measurement of lease liabilities	$	10,539	$	23,714

INCOME TAXES	6 Months Ended
INCOME TAXES	Jun. 30, 2019
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES At the end of each interim period, the Company estimates 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 June 30, 2019, the Company recorded an income tax provision of $16.3 million, which represents an effective income tax rate of 10%, which is lower than the statutory rate of 21%, due primarily to excess tax benefits generated by the exercise and vesting of stock-based awards. For the six months ended June 30, 2019, the Company recorded an income tax benefit, despite pre-tax income, of $47.3 million due primarily to excess tax benefits generated by the exercise and vesting of stock-based awards. For the three and six months ended June 30, 2018, the Company recorded income tax provisions of $31.4 million and $2.4 million, respectively, which represent effective income tax rates of 10% and 1%, respectively. The effective tax rates are lower than the statutory rate of 21% 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 2012 has been extended to July 31, 2020 and the statute of limitations for the years 2013 through 2015 has been extended to December 31, 2020. 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 June 30, 2019 and December 31, 2018, unrecognized tax benefits, including interest and penalties, are $52.0 million and $52.3 million, respectively. If unrecognized tax benefits at June 30, 2019 are subsequently recognized, $48.6 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 June 30, 2020, due to expirations of statutes of limitations or other settlements; $23.5 million of which would reduce the income tax provision.

FINANCIAL INSTRUMENTS

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

FINANCIAL INSTRUMENTS

Marketable Securities

At June 30, 2019 and December 31, 2018, the fair value of marketable securities are as follows:



	June 30, 2019		December 31, 2018
	(In thousands)
Marketable equity securities	$	161,749	$	419
Available-for-sale marketable debt securities	—		123,246
Total marketable securities	$	161,749	$	123,665

The Company has an investment in Pinterest, which became a publicly-traded company in the second quarter of 2019. With effect from Pinterest's initial public offering, the Company's investment has been accounted for as a marketable security. Prior to this, the Company accounted for its investment in Pinterest as an equity security without a readily determinable fair value. For both the three and six months ended June 30, 2019, the Company recognized an unrealized gain of $29.8 million related to its investment in Pinterest, which is included in “Other income, net” in the accompanying consolidated statement of operations.

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 June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(In thousands)
Proceeds from maturities of available-for-sale marketable debt securities	$	40,000	$	5,000	$	163,500	$	10,000

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 and six months ended June 30, 2019 and 2018.

Equity securities without readily determinable fair values

At June 30, 2019 and December 31, 2018, the carrying values of the Company's investments in equity securities without readily determinable fair values totaled $102.0 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, 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 June 30, 2019 and 2018.



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(In thousands)
Upward adjustments (gross unrealized gains)	$	—		$	128,786		$	—		$	128,786
Downward adjustments including impairment (gross unrealized losses)	(500		)	(2,396		)	(650		)	(2,588		)
Total	$	(500	)	$	126,390		$	(650	)	$	126,198

The cumulative upward and downward adjustments (including impairments) to the carrying value of equity securities without readily determinable fair values held at June 30, 2019 were $0.2 million and $(2.7) million, respectively.

Realized and unrealized gains and losses for the Company's marketable equity securities and investments without readily determinable fair values for the three and six months ended June 30, 2019 and 2018 are as follows:



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(In thousands)
Realized gains, net, for equity securities sold	$	2,066	$	27,275	$	2,144	$	27,172
Unrealized gains, net, on equity securities held	29,369		126,414		29,247		126,559
Total gains recognized, net, in other income, net	$	31,435	$	153,689	$	31,391	$	153,731

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:



	June 30, 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	$	1,754,220	$	—	$	—		$	1,754,220
Treasury discount notes	—		711,877		—			711,877
Time deposits	—		145,036		—			145,036
Commercial paper	—		30,956		—			30,956
Marketable securities:
Marketable equity security	161,749		—		—			161,749
Total	$	1,915,969	$	887,869	$	—		$	2,803,838

Liabilities:
Contingent consideration arrangement	$	—	$	—	$	(29,803	)	$	(29,803	)



	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 June 30,
	2019			2018
	(In thousands)
Balance at April 1	$	(28,186	)	$	(1,965	)
Total net (losses) gains:
Included in earnings:
Fair value adjustments	(1,617		)	(54		)
Included in other comprehensive income	—			109
Balance at June 30	$	(29,803	)	$	(1,910	)



	Contingent Consideration Arrangements
	Six Months Ended June 30,
	2019			2018
	(In thousands)
Balance at January 1	$	(28,631	)	$	(2,647	)
Total net losses:
Included in earnings:
Fair value adjustments	(3,146		)	(210		)
Included in other comprehensive loss	(14		)	(1		)
Settlements	1,988			948
Balance at June 30	$	(29,803	)	$	(1,910	)

Contingent Consideration Arrangements

At June 30, 2019, the Company has one outstanding contingent consideration arrangement related to a business acquisition. The arrangement has a total maximum contingent payment of $45.0 million. At June 30, 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.

Generally, our contingent consideration arrangements are based upon financial performance and/or operating metric targets. 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 are 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 value of the contingent consideration arrangement at June 30, 2019 reflects a discount rate of 25%. The fair values 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 expected achievement of the applicable targets 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 June 30, 2019 and December 31, 2018 includes a current portion of $12.6 million and $2.0 million, respectively, and a non-current portion of $17.2 million and $26.6 million, respectively. The 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:



	June 30, 2019						December 31, 2018
	Carrying Value			Fair Value			Carrying Value			Fair Value
	(In thousands)
Current portion of long-term debt	$	(13,750	)	$	(13,681	)	$	(13,750	)	$	(12,753	)
Long-term debt, net^(a)	(3,138,531		)	(3,914,422		)	(2,245,548		)	(2,460,204		)

_____________________


^(a)	At June 30, 2019 and December 31, 2018, the carrying value of long-term debt, net includes unamortized original issue discount and debt issuance costs of $429.1 million and $88.9 million, respectively.

At June 30, 2019 and December 31, 2018, the fair value of long-term debt 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's $500 million revolving credit facility ("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 MTCH's $350 million aggregate principal amount of its 5.625% Senior Notes issued on February 15, 2019. See "Note 5—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

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

LONG-TERM DEBT

Long-term debt consists of:



	June 30, 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	6,695		7,352
Less: unamortized debt issuance costs	15,698		11,737
Total MTCH debt, net	1,602,607		1,515,911

ANGI Debt:
ANGI Term Loan due November 5, 2023	254,375		261,250
Less: current portion of ANGI Term Loan	13,750		13,750
Less: unamortized debt issuance costs	2,268		2,529
Total ANGI debt, net	238,357		244,971

IAC Debt:
0.875% Exchangeable Senior Notes due October 1, 2022 (the "0.875% Exchangeable Notes due 2022"); 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
0.875% Exchangeable Senior Notes due June 15, 2026 (the "0.875% Exchangeable Notes due 2026"); interest payable each June 15 and December 15; commencing on December 15, 2019	575,000		—
2.00% Exchangeable Senior Notes due January 15, 2030 (the "2.00% Exchangeable Notes due 2030"); interest payable each January 15 and July 15; commencing on January 15, 2020	575,000		—
Total IAC long-term debt	1,701,989		551,989
Less: unamortized original issue discount	372,629		54,025
Less: unamortized debt issuance costs	31,793		13,298
Total IAC debt, net	1,297,567		484,666

Total long-term debt, net	$	3,138,531	$	2,245,548

MTCH Senior Notes

The 6.375% MTCH Senior Notes were issued on June 1, 2016. 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 5.00% MTCH Senior Notes were issued on December 4, 2017. 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 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 June 30, 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.

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

MTCH Term Loan and MTCH Credit Facility

At both June 30, 2019 and December 31, 2018, the outstanding balance on the MTCH Term Loan was $425.0 million. The MTCH Term Loan bears interest at LIBOR plus 2.50%, and was 4.90% and 5.09% at June 30, 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.

At June 30, 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. MTCH's Credit Facility expires on December 7, 2023. The annual commitment fee on undrawn funds is based on the MTCH consolidated net leverage ratio, and is 30 basis points and 25 basis points at June 30, 2019 and December 31, 2018, respectively. 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 credit 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 June 30, 2019 and December 31, 2018, the outstanding balance on the ANGI Term Loan was $254.4 million and $261.3 million, respectively. At both June 30, 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 June 30, 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 June 30, 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 June 30, 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 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

0.875% Exchangeable Notes due 2022

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 Notes due 2022. The 0.875% Exchangeable Notes due 2022 are guaranteed by the Company. Each $1,000 of principal of the 0.875% Exchangeable Notes due 2022 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 the 0.875% Exchangeable Notes due 2022 with any of the three following alternatives: (1) shares of the Company's common stock, (2) cash or (3) a combination of cash and shares of the Company's common stock. It is the Company's intention to settle the 0.875% Exchangeable Notes due 2022 with cash equal to the face amount of the notes upon exchange; any shares issued would be offset by shares received upon exercise of the Note Hedge (described below).

The 0.875% Exchangeable Notes due 2022 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 the Company's 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; (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 the Company's 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 0.875% Exchangeable Notes due 2022. 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 0.875% Exchangeable Notes due 2022 regardless of the foregoing conditions. The Company’s 0.875% Exchangeable Notes due 2022 are currently exchangeable; during the three and six months ended June 30, 2019, no notes were exchanged.

We separately account for the debt and the equity components of the 0.875% Exchangeable Notes due 2022, and therefore, the Company recorded an original issue discount and corresponding increase to additional paid-in capital of $70.4 million, which was the fair value attributed to the exchange feature of the debt at issuance. The Company is amortizing the original issue discount utilizing the effective interest method over the life of the 0.875% Exchangeable Notes due 2022, which increases the effective interest rate from its coupon rate of 0.875% to 3.88%. For the three and six months ended June 30, 2019, the Company incurred interest expense of $5.4 million and $10.8 million, which includes amortization of original issue discount of $3.4 million and $6.8 million, and debt issuance costs of $0.9 million and $1.7 million, respectively. For the three and six months ended June 30, 2018, the Company incurred interest expense of $5.3 million and $10.5 million, which includes amortization of original issue discount of $3.3 million and $6.5 million, and debt issuance costs of $0.8 million and $1.7 million, respectively. As of June 30, 2019 and December 31, 2018, the unamortized original issue discount was $47.3 million and $54.0 million, resulting in a net carrying value of the liability component of $470.2 million and $463.5 million, respectively.

The if-converted value of the 0.875% Exchangeable Notes due 2022 exceeded its principal amount by $222.2 million and $105.0 million based on the Company's stock price on June 30, 2019 and December 31, 2018, respectively.

Note Hedge and Warrants

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 0.875% Exchangeable Notes due 2022 at approximately $152.18 per share (the "0.875% Exchangeable Notes due 2022 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 "0.875% Exchangeable Notes due 2022 Warrants"). The 0.875% Exchangeable Notes due 2022 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 0.875% Exchangeable Notes due 2022 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 its strike price of $229.70.

0.875% Exchangeable Notes due 2026 and 2.00% Exchangeable Notes due 2030

Exchangeable Notes

During the second quarter of 2019, IAC FinanceCo 2, Inc., a direct, wholly-owned subsidiary of the Company, issued $575.0 million aggregate principal amount of its 0.875% Exchangeable Notes due 2026 and IAC FinanceCo 3, Inc., a direct, wholly-owned subsidiary of the Company, issued $575.0 million aggregate principal amount of its 2.00% Exchangeable Notes due 2030. The 0.875% Exchangeable Notes due 2026 and the 2.00% Exchangeable Notes due 2030 are both guaranteed by the Company. Each $1,000 of principal of the 0.875% Exchangeable Notes due 2026 is exchangeable for 3.3028 shares of the Company's common stock, which is equivalent to an exchange price of approximately $302.77 per share, subject to adjustment upon the occurrence of specified events. Each $1,000 of principal of the 2.00% Exchangeable Notes due 2030 is exchangeable for 3.4323 shares of the Company's common stock, which is equivalent to an exchange price of approximately $291.35 per share, subject to adjustment upon the occurrence of specified events. Upon exchange, the Company has the right to settle the principal amount of the 0.875% Exchangeable Notes due 2026 and the 2.00% Exchangeable Notes due 2030 with any of the three following alternatives: (1) shares of the Company's common stock, (2) cash or (3) a combination of cash and shares of the Company's common stock. The Company's intent is to settle the principal amount of the 0.875% Exchangeable Notes due 2026 and the 2.00% Exchangeable Notes due 2030 in cash upon exchange.

The 0.875% Exchangeable Notes due 2026 and the 2.00% Exchangeable Notes due 2030 are exchangeable at any time prior to the close of business on the business day immediately preceding March 15, 2026 and October 15, 2029, respectively, only under the following circumstances: (1) during any calendar quarter (and only during such calendar quarter), if the last

reported sale price of the Company's 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; (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 the Company's 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 indentures governing the 0.875% Exchangeable Notes due 2026 and the 2.00% Exchangeable Notes due 2030. Additionally, each of IAC FinanceCo 2, Inc. and IAC FinanceCo 3, Inc. may redeem for cash all or any portion of its applicable notes, at its option, on or after June 20, 2023 and July 20, 2026, respectively, if the last reported sale price of the common stock underlying the respective notes has been at least 130% of the exchange price then in effect for at least 20 trading days (whether or not consecutive), including at least one of the five trading days immediately preceding the date on which the notice of redemption is provided, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the applicable issuer provides notice of redemption, at a redemption price equal to 100% of the principal amount to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date. On or after March 15, 2026 and October 15, 2029 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 0.875% Exchangeable Notes due 2026 and 2.00% Exchangeable Notes due 2030, respectively, regardless of the foregoing conditions.

The net proceeds from the sales of the 0.875% Exchangeable Notes due 2026 and the 2.00% Exchangeable Notes due 2030 were approximately $1.1 billion, after deducting fees and expenses. A portion of the net proceeds from the offering were used to pay the net premium of $136.9 million on the 0.875% Exchangeable Notes due 2026 Hedge and Warrants and the 2.00% Exchangeable Notes due 2030 Hedge and Warrants (described below) and the remainder will be used for general corporate purposes.

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 $138.8 million for the 0.875% Exchangeable Notes due 2026 and $189.2 million for the 2.00% Exchangeable Notes due 2030, which is the fair value attributed to the exchange feature of each series of debt at issuance. The Company is amortizing the original issue discount utilizing the effective interest method over the life of the 0.875% Exchangeable Notes due 2026 and the 2.00% Exchangeable Notes due 2030, which increases the effective interest rate from its coupon rate of 0.875% and 2.00% to 4.98% and 6.29%, respectively. For both the three and six months ended June 30, 2019, the Company incurred interest expense of $4.3 million, which includes amortization of original issue discount of $2.6 million, and debt issuance costs of $0.2 million. As of June 30, 2019, the unamortized original issue discount on the 0.875% Exchangeable Notes due 2026 is $137.3 million, resulting in a net carrying value of the liability component of $437.7 million. As of June 30, 2019, the unamortized original issue discount on the 2.00% Exchangeable Notes due 2030 is $188.1 million, resulting in a net carrying value of the liability component of $386.9 million.

Note Hedge and Warrants

In connection with the debt offerings, the Company purchased call options allowing the Company to purchase initially (subject to adjustment upon the occurrence of specified events) the entire 1.9 million and 2.0 million shares that would be issuable upon the exchange of the 0.875% Exchangeable Notes due 2026 and the 2.00% Exchangeable Notes due 2030, respectively, at approximately $302.77 per share (the "0.875% Exchangeable Notes due 2026 Hedge") and $291.35 per share (the "2.00% Exchangeable Notes due 2030 Hedge"), and sold warrants allowing the holder to purchase initially (subject to adjustment upon the occurrence of specified events) 1.9 million and 2.0 million shares, respectively, at $457.02 per share (the "0.875% Exchangeable Notes due 2026 Warrants" and the "2.00% Exchangeable Notes due 2030 Warrants," respectively).

The 0.875% Exchangeable Notes due 2026 Hedge and the 2.00% Exchangeable Notes due 2030 Hedge are 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 2, Inc. and IAC FinanceCo 3, Inc. are required to make in excess of the principal amount of the exchanged notes. The 0.875% Exchangeable Notes due 2026 Warrants and the 2.00% Exchangeable Notes due 2030 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 their strike prices of $457.02, respectively.

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 11—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 June 30, 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 June 30, 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 June 30, 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.

Maturities of long-term debt as of June 30, 2019 (in thousands):



Remainder of 2019	$	6,875
2020	13,750
2021	13,750
2022	1,004,489
2023	192,500
After 2023	2,350,000
Total	3,581,364
Less: current portion of long-term debt	13,750
Less: unamortized original issue discount	379,324
Less: unamortized debt issuance costs	49,759
Total long-term debt, net	$	3,138,531

ACCUMULATED OTHER COMPREHENSIVE LOSS

6 Months Ended

Jun. 30, 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 June 30, 2019
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Debt Securities			Accumulated Other Comprehensive (Loss) Income
	(In thousands)
Balance as of April 1	$	(126,725	)	$	6		$	(126,719	)
Other comprehensive income (loss)	1,097			(6		)	1,091
Net current period other comprehensive income (loss)	1,097			(6		)	1,091
Allocation of accumulated other comprehensive loss related to the noncontrolling interests	(77		)	—			(77		)
Balance as of June 30	$	(125,705	)	$	—		$	(125,705	)



	Three Months Ended June 30, 2018
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Debt Securities		Accumulated Other Comprehensive Loss
	(In thousands)
Balance as of April 1	$	(74,950	)	$	—	$	(74,950	)
Other comprehensive (loss) income before reclassifications	(37,266		)	13		(37,253		)
Amounts reclassified to earnings	(191		)	—		(191		)
Net current period other comprehensive (loss) income	(37,457		)	13		(37,444		)
Allocation of accumulated other comprehensive loss related to the noncontrolling interests	(323		)	—		(323		)
Balance as of June 30	$	(112,730	)	$	13	$	(112,717	)



	Six Months Ended June 30, 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 (loss)	2,090			(4		)	2,086
Net current period other comprehensive income (loss)	2,090			(4		)	2,086
Allocation of accumulated other comprehensive income related to the noncontrolling interests	931			—			931
Balance as of June 30	$	(125,705	)	$	—		$	(125,705	)



	Six Months Ended June 30, 2018
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Debt Securities		Accumulated Other Comprehensive Loss
	(In thousands)
Balance as of January 1	$	(103,568	)	$	—	$	(103,568	)
Other comprehensive (loss) income before reclassifications	(9,048		)	13		(9,035		)
Amounts reclassified to earnings	(52		)	—		(52		)
Net current period other comprehensive (loss) income	(9,100		)	13		(9,087		)
Allocation of accumulated other comprehensive loss related to the noncontrolling interests	(62		)	—		(62		)
Balance as of June 30	$	(112,730	)	$	13	$	(112,717	)

The amount reclassified out of foreign currency translation adjustment into earnings for the three and six months ended June 30, 2018 relate to the liquidation of an international subsidiary.

At both June 30, 2019 and 2018, there was no tax benefit or provision on the accumulated other comprehensive loss.

EARNINGS PER SHARE

6 Months Ended

Jun. 30, 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 June 30,
	2019						2018
	Basic			Diluted			Basic			Diluted
	(In thousands, except per share data)
Numerator:
Net earnings	$	146,791		$	146,791		$	280,854		$	280,854
Net earnings attributable to noncontrolling interests	(33,324		)	(33,324		)	(62,501		)	(62,501		)
Impact from publicly-traded subsidiaries' dilutive securities ^(a)	—			(6,136		)	—			(6,994		)
Net earnings attributable to IAC shareholders	$	113,467		$	107,331		$	218,353		$	211,359

Denominator:
Weighted average basic shares outstanding	84,139			84,139			83,604			83,604
Dilutive securities^{(a) (b) (c) (d)}	—			5,965			—			7,330
Denominator for earnings per share—weighted average shares ^{(a) (b) (c) (d)}	84,139			90,104			83,604			90,934

Earnings per share attributable to IAC shareholders:
Earnings per share	$	1.35		$	1.19		$	2.61		$	2.32



	Six Months Ended June 30,
	2019						2018
	Basic			Diluted			Basic			Diluted
	(In thousands, except per share data)
Numerator:
Net earnings	$	259,776		$	259,776		$	368,693		$	368,693
Net earnings attributable to noncontrolling interests	(57,614		)	(57,614		)	(79,258		)	(79,258		)
Impact from publicly-traded subsidiaries' dilutive securities ^(a)	—			(12,832		)	—			(12,569		)
Net earnings attributable to IAC shareholders	$	202,162		$	189,330		$	289,435		$	276,866

Denominator:
Weighted average basic shares outstanding	84,023			84,023			83,296			83,296
Dilutive securities ^{(a) (b) (c) (d)}	—			6,205			—			7,438
Denominator for earnings per share—weighted average shares ^{(a) (b) (c) (d)}	84,023			90,228			83,296			90,734

Earnings per share attributable to IAC shareholders:
Earnings per share	$	2.41		$	2.10		$	3.47		$	3.05

_____________________


^(a)	IAC has the option to settle certain MTCH and ANGI stock-based awards in its shares. For the three and six months ended June 30, 2019, it is more dilutive for IAC to settle certain ANGI equity awards and MTCH to settle certain MTCH equity awards. For the three and six months ended June 30, 2018, it is more dilutive for IAC to settle certain MTCH and ANGI 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 both the three and six months ended June 30, 2019, 11.2 million potentially dilutive securities are excluded from the calculation of diluted earnings per share because their inclusion would have been anti-dilutive. For the three and six months ended June 30, 2018, 3.4 million and 6.9 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 both three and six months ended June 30, 2019, 0.3 million shares 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. For both the three and six months ended June 30, 2018, 0.2 million shares 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, $302.77 and $291.35 per share exchange price per $1,000 principal amount of the 0.875% Exchangeable Notes due 2022, the 0.875% Exchangeable Notes due 2026 and the 2.00% Exchangeable Notes due 2030, respectively. The average price of IAC common stock was $223.29 and $215.28 for the three and six months ended June 30, 2019, respectively, and the dilutive impact of the 0.875% Exchangeable Notes due 2022, which is the only series of Exchangeable Notes that is currently dilutive, was 1.1 million and 1.0 million shares, respectively.

For the three months ended June 30, 2018, the average price of IAC common stock was $153.21 and the dilutive impact of the 0.875% Exchangeable Notes due 2022 was less than 0.1 million shares. For the six months ended June 30, 2018, the average price of IAC common stock was $150.39 and the 0.875% Exchangeable Notes due 2022 were anti-dilutive.

SEGMENT INFORMATION

6 Months Ended

Jun. 30, 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 June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(In thousands)
Revenue:
Match Group	$	497,973		$	421,196		$	962,598		$	828,563
ANGI Homeservices	343,896			294,822			647,339			550,133
Vimeo	45,713			39,560			89,294			75,128
Dotdash	37,728			30,757			71,689			60,788
Applications	132,937			143,074			276,486			275,061
Emerging & Other	128,542			129,796			245,290			264,681
Inter-segment eliminations	(131		)	(83		)	(195		)	(157		)
Total	$	1,186,658		$	1,059,122		$	2,292,501		$	2,054,197

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(In thousands)
Match Group
Direct revenue:
North America	$	251,499	$	222,163	$	489,272	$	433,520
International	235,801		185,564		451,990		366,944
Total Direct revenue	487,300		407,727		941,262		800,464
Indirect revenue (principally advertising revenue)	10,673		13,469		21,336		28,099
Total Match Group revenue	$	497,973	$	421,196	$	962,598	$	828,563

ANGI Homeservices
Marketplace:
Consumer connection revenue	$	241,236	$	187,172	$	442,818	$	336,232
Membership subscription revenue	16,485		16,565		33,002		32,192
Other revenue	1,807		998		3,633		1,919
Total Marketplace revenue	259,528		204,735		479,453		370,343
Advertising and other revenue	64,872		72,770		126,941		143,188
Total North America revenue	324,400		277,505		606,394		513,531
Consumer connection revenue	15,232		12,496		32,355		26,863
Membership subscription revenue	3,613		4,517		7,355		9,188
Advertising and other revenue	651		304		1,235		551
Total Europe revenue	19,496		17,317		40,945		36,602
Total ANGI Homeservices revenue	$	343,896	$	294,822	$	647,339	$	550,133

Vimeo
Platform revenue	$	45,713	$	36,293	$	87,015	$	69,225
Hardware revenue	—		3,267		2,279		5,903



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(In thousands)
Total Vimeo revenue	$	45,713	$	39,560	$	89,294	$	75,128

Dotdash
Advertising revenue	$	29,005	$	24,552	$	55,013	$	47,765
Affiliate commerce commission and other revenue	8,723		6,205		16,676		13,023
Total Dotdash revenue	$	37,728	$	30,757	$	71,689	$	60,788

Applications
Desktop:
Advertising revenue:
Google advertising revenue	$	78,085	$	107,550	$	166,135	$	216,127
Other advertising revenue	2,846		2,112		6,194		3,807
Total advertising revenue	80,931		109,662		172,329		219,934
Subscription and other revenue	3,908		4,768		8,496		12,084
Total Desktop revenue	84,839		114,430		180,825		232,018
Mosaic Group:
Subscription and other revenue	45,680		23,521		90,828		32,530
Advertising revenue	2,418		5,123		4,833		10,513
Total Mosaic Group revenue	48,098		28,644		95,661		43,043
Total Applications revenue	$	132,937	$	143,074	$	276,486	$	275,061

Emerging & Other
Advertising revenue:
Google advertising revenue	$	105,325	$	88,355	$	201,598	$	181,106
Other advertising revenue	8,299		16,799		15,276		30,068
Total advertising revenue	113,624		105,154		216,874		211,174
Other revenue	14,918		24,642		28,416		53,507
Total Emerging & Other revenue	$	128,542	$	129,796	$	245,290	$	264,681

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 June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(In thousands)
Revenue:
United States	$	774,095	$	708,571	$	1,486,476	$	1,366,151
All other countries	412,563		350,551		806,025		688,046
Total	$	1,186,658	$	1,059,122	$	2,292,501	$	2,054,197



	June 30, 2019		December 31, 2018
	(In thousands)
Long-lived assets (excluding goodwill and intangible assets):
United States	$	334,439	$	289,756
All other countries	27,111		29,044
Total	$	361,550	$	318,800

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



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(In thousands)
Operating Income (Loss):
Match Group	$	172,898		$	150,165		$	291,726		$	262,398
ANGI Homeservices	11,403			23,262			7,762			12,506
Vimeo	(11,616		)	(9,593		)	(29,400		)	(19,341		)
Dotdash	7,010			1,339			10,057			4,530
Applications	20,967			33,077			46,323			58,538
Emerging & Other	(1,789		)	6,079			(4,309		)	12,572
Corporate	(44,563		)	(35,892		)	(87,976		)	(72,816		)
Total	$	154,310		$	168,437		$	234,183		$	258,387



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(In thousands)
Adjusted EBITDA^(a):
Match Group	$	203,522		$	175,561		$	358,589		$	313,302
ANGI Homeservices	$	51,432		$	66,979		$	88,611		$	103,619
Vimeo	$	(9,464	)	$	(7,631	)	$	(25,664	)	$	(15,415	)
Dotdash	$	8,375		$	1,994		$	15,525		$	5,843
Applications	$	25,319		$	35,404		$	55,007		$	62,156
Emerging & Other	$	(1,517	)	$	8,290		$	(3,612	)	$	16,498
Corporate	$	(18,586	)	$	(15,552	)	$	(38,806	)	$	(32,560	)

_____________________

^(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) to Adjusted EBITDA for the Company's reportable segments:



	Three Months Ended June 30, 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	$	172,898		$	22,015	$	8,197	$	412	$	—	$	203,522
ANGI Homeservices	11,403			$	17,520	$	8,796	$	13,713	$	—	$	51,432
Vimeo	(11,616		)	$	—	$	132	$	2,020	$	—	$	(9,464	)
Dotdash	7,010			$	—	$	218	$	1,147	$	—	$	8,375
Applications	20,967			$	—	$	389	$	2,346	$	1,617	$	25,319
Emerging & Other	(1,789		)	$	—	$	272	$	—	$	—	$	(1,517	)
Corporate	(44,563		)	$	22,890	$	3,087	$	—	$	—	$	(18,586	)
Operating income	154,310
Interest expense	(37,206		)
Other income, net	45,972
Earnings before income taxes	163,076
Income tax provision	(16,285		)
Net earnings	146,791
Net earnings attributable to noncontrolling interests	(33,324		)
Net earnings attributable to IAC shareholders	$	113,467



	Three Months Ended June 30, 2018
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	150,165		$	16,706	$	8,399	$	237	$	54	$	175,561
ANGI Homeservices	23,262			$	22,053	$	5,886	$	15,778	$	—	$	66,979
Vimeo	(9,593		)	$	—	$	321	$	1,641	$	—	$	(7,631	)
Dotdash	1,339			$	—	$	246	$	409	$	—	$	1,994
Applications	33,077			$	—	$	773	$	1,554	$	—	$	35,404
Emerging & Other	6,079			$	1,293	$	349	$	569	$	—	$	8,290
Corporate	(35,892		)	$	17,509	$	2,831	$	—	$	—	$	(15,552	)
Operating income	168,437
Interest expense	(27,356		)
Other income, net	171,141
Earnings before income taxes	312,222
Income tax provision	(31,368		)
Net earnings	280,854
Net earnings attributable to noncontrolling interests	(62,501		)
Net earnings attributable to IAC shareholders	$	218,353



	Six Months Ended June 30, 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	$	291,726		$	50,012	$	16,028	$	823	$	—	$	358,589
ANGI Homeservices	7,762			$	36,802	$	15,795	$	28,252	$	—	$	88,611
Vimeo	(29,400		)	$	—	$	325	$	3,411	$	—	$	(25,664	)
Dotdash	10,057			$	—	$	444	$	5,024	$	—	$	15,525
Applications	46,323			$	—	$	808	$	4,730	$	3,146	$	55,007
Emerging & Other	(4,309		)	$	—	$	547	$	150	$	—	$	(3,612	)
Corporate	(87,976		)	$	43,055	$	6,115	$	—	$	—	$	(38,806	)
Operating income	234,183
Interest expense	(68,349		)
Other income, net	46,623
Earnings before income taxes	212,457
Income tax benefit	47,319
Net earnings	259,776
Net earnings attributable to noncontrolling interests	(57,614		)
Net earnings attributable to IAC shareholders	$	202,162



	Six Months Ended June 30, 2018
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	262,398		$	33,669	$	16,546	$	479	$	210	$	313,302
ANGI Homeservices	12,506			$	46,959	$	12,070	$	32,084	$	—	$	103,619
Vimeo	(19,341		)	$	—	$	656	$	3,270	$	—	$	(15,415	)
Dotdash	4,530			$	—	$	495	$	818	$	—	$	5,843
Applications	58,538			$	—	$	1,528	$	2,090	$	—	$	62,156
Emerging & Other	12,572			$	1,424	$	1,102	$	1,400	$	—	$	16,498
Corporate	(72,816		)	$	34,591	$	5,665	$	—	$	—	$	(32,560	)
Operating income	258,387
Interest expense	(53,861		)
Other income, net	166,522
Earnings before income taxes	371,048
Income tax provision	(2,355		)
Net earnings	368,693
Net earnings attributable to noncontrolling interests	(79,258		)
Net earnings attributable to IAC shareholders	$	289,435

CONSOLIDATED FINANCIAL STATEMENT DETAILS

6 Months Ended

Jun. 30, 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:



	June 30, 2019		December 31, 2018		June 30, 2018		December 31, 2017
	(In thousands)
Cash and cash equivalents	$	3,151,959	$	2,131,632	$	1,644,829	$	1,630,809
Restricted cash included in other current assets	1,574		1,633		347		2,873
Restricted cash included in other non-current assets	420		420		—		—
Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows	$	3,153,953	$	2,133,685	$	1,645,176	$	1,633,682

Restricted cash at June 30, 2019 and December 31, 2018 primarily consists of a cash collateralized letter of credit and a deposit related to corporate credit cards.

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

Other income, net



	Three Months Ended June 30,		Six Months Ended June 30,
	2019	2018	2019	2018
	(In thousands)
Other income, net	$45,972	$171,141	$46,623	$166,522

Three months ended June 30, 2019 and 2018

Other income, net in 2019 includes: a $29.8 million unrealized gain related to our investment in Pinterest, which became a publicly-traded company in the second quarter of 2019; $14.5 million of interest income; and $2.1 million in net foreign currency exchange gains due primarily to the strengthening of the Euro and the U.S. dollar relative to the British Pound during the three months ended June 30, 2019.

Other income, net in 2018 includes: a $26.8 million realized gain on the sale of certain Pinterest shares held by the Company and a $128.8 million unrealized gain to adjust our remaining interest in Pinterest to fair value in accordance with ASU No. 2016-01, which was adopted effective January 1, 2018; $10.0 million in net foreign currency exchange gains due primarily to the strengthening of the U.S. dollar relative to the British Pound and Euro during the three months ended June 30, 2018; and interest income of $7.0 million.

Six months ended June 30, 2019 and 2018

Other income, net in 2019 includes: a $29.8 million unrealized gain related to our investment in Pinterest, as described above in the three-month discussion; $26.9 million of interest income; and a realized loss of $8.2 million related to the sale of a business.

Other income, net in 2018 includes: a $26.8 million realized gains on the sale of certain Pinterest shares held by the Company and a $128.8 million unrealized gain on our remaining interest in Pinterest, as described above in the three-month discussion; $12.2 million of interest income; and $2.1 million in net foreign currency exchange gains due primarily to the strengthening of the U.S. dollar relative to the British Pound and Euro during the six months ended June 30, 2018.

CONTINGENCIES	6 Months Ended
CONTINGENCIES	Jun. 30, 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 3—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. On August 31, 2018, four plaintiffs who were still employed by Match Group filed a notice of discontinuance of their claims without prejudice, leaving the six former employees as the remaining plaintiffs. On October 9, 2018, the defendants filed a motion to dismiss the complaint on various grounds, including that the 2017 valuation of Tinder by the investment banks was an expert determination any challenge to which is both time-barred under applicable law and available only on narrow substantive grounds that the plaintiffs have not pleaded in their complaint; the plaintiffs opposed the motion. On June 13, 2019, the court issued a decision and order (i) granting the motion to dismiss the claims for breach of the implied covenant of good faith and fair dealing and for unjust enrichment, (ii) granting the motion to dismiss the merger-related claim for breach of contract as to two of the remaining six plaintiffs, and (iii) otherwise denying the motion to dismiss. The defendants have appealed from the court's partial denial of their motion to dismiss. On June 3, 2019, the defendants filed a second motion to dismiss based upon certain provisions of the plaintiffs' agreement with a litigation funding firm; the plaintiffs have opposed the motion, which remains pending. Discovery in the case is proceeding. 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

6 Months Ended

Jun. 30, 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 June 30, 2019 and December 31, 2018 and for the three and six months ended June 30, 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 June 30, 2019:



	IAC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			IAC Consolidated
	(In thousands)
Cash and cash equivalents	$	2,133,905	$	—	$	1,018,054	$	—		$	3,151,959
Marketable securities	—		—		161,749		—			161,749
Accounts receivable, net of allowance and reserves	—		90,545		274,950		—			365,495
Other current assets	24,852		38,163		172,650		(781		)	234,884
Intercompany receivables	—		1,414,117		133,953		(1,548,070		)	—
Right-of-use assets	10,861		40,151		155,833		(26,555		)	180,290
Property and equipment, net of accumulated depreciation and amortization	6,962		171,593		182,995		—			361,550
Goodwill	—		412,009		2,480,953		—			2,892,962
Intangible assets, net of accumulated amortization	—		43,712		584,706		—			628,418
Investment in subsidiaries	2,132,545		427,476		—		(2,560,021		)	—
Other non-current assets	294,891		88,523		97,554		(159,170		)	321,798
Total assets	$	4,604,016	$	2,726,289	$	5,263,397	$	(4,294,597	)	$	8,299,105

Current portion of long-term debt	$	—	$	—	$	13,750	$	—		$	13,750
Accounts payable, trade	2,079		43,999		58,314		—			104,392
Other current liabilities	25,552		83,694		731,436		(5,362		)	835,320
Long-term debt, net	34,291		—		3,104,240		—			3,138,531
Income taxes payable	—		1,612		34,921		—			36,533
Intercompany liabilities	1,548,070		—		—		(1,548,070		)	—
Other long-term liabilities	10,563		54,227		362,834		(181,144		)	246,480
Redeemable noncontrolling interests	—		—		80,502		—			80,502
Shareholders' equity	2,983,461		2,542,757		17,264		(2,560,021		)	2,983,461
Noncontrolling interests	—		—		860,136		—			860,136
Total liabilities and shareholders' equity	$	4,604,016	$	2,726,289	$	5,263,397	$	(4,294,597	)	$	8,299,105

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 June 30, 2019:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	200,963		$	985,825		$	(130	)	$	1,186,658
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	19			90,383			186,065			(78		)	276,389
Selling and marketing expense	384			55,710			355,086			(78		)	411,102
General and administrative expense	39,634			11,270			174,589			21			225,514
Product development expense	469			13,353			64,787			5			78,614
Depreciation	432			2,914			17,745			—			21,091
Amortization of intangibles	—			1,148			18,490			—			19,638
Total operating costs and expenses	40,938			174,778			816,762			(130		)	1,032,348
Operating (loss) income	(40,938		)	26,185			169,063			—			154,310
Equity in earnings of unconsolidated affiliates	145,997			4,542			—			(150,539		)	—
Interest expense	(424		)	—			(36,782		)	—			(37,206		)
Other (expense) income, net	(7,801		)	12,741			52,755			(11,723		)	45,972
Earnings before income taxes	96,834			43,468			185,036			(162,262		)	163,076
Income tax benefit (provision)	16,633			(4,136		)	(28,782		)	—			(16,285		)
Net earnings	113,467			39,332			156,254			(162,262		)	146,791
Net earnings attributable to noncontrolling interests	—			—			(33,324		)	—			(33,324		)
Net earnings attributable to IAC shareholders	$	113,467		$	39,332		$	122,930		$	(162,262	)	$	113,467
Comprehensive income attributable to IAC shareholders	$	114,558		$	39,117		$	124,408		$	(163,525	)	$	114,558

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



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	207,964		$	851,240		$	(82	)	$	1,059,122
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	75			61,215			156,991			(57		)	218,224
Selling and marketing expense	189			80,302			289,205			(36		)	369,660
General and administrative expense	31,652			14,259			142,441			11			188,363
Product development expense	564			14,151			60,730			—			75,445
Depreciation	266			3,126			15,413			—			18,805
Amortization of intangibles	—			410			19,778			—			20,188
Total operating costs and expenses	32,746			173,463			684,558			(82		)	890,685
Operating (loss) income	(32,746		)	34,501			166,682			—			168,437
Equity in earnings of unconsolidated affiliates	252,102			5,054			—			(257,156		)	—
Interest expense	(423		)	—			(26,933		)	—			(27,356		)
Other income, net ^(a)	6,436			62,204			153,770			(51,269		)	171,141
Earnings before income taxes	225,369			101,759			293,519			(308,425		)	312,222
Income tax provision	(7,016		)	(12,159		)	(12,193		)	—			(31,368		)
Net earnings	218,353			89,600			281,326			(308,425		)	280,854
Net earnings attributable to noncontrolling interests	—			—			(62,501		)	—			(62,501		)
Net earnings attributable to IAC shareholders	$	218,353		$	89,600		$	218,825		$	(308,425	)	$	218,353
Comprehensive income attributable to IAC shareholders	$	180,909		$	89,304		$	173,337		$	(262,641	)	$	180,909

_____________________


^(a)	During the three months ended June 30, 2018, foreign cash of $50.0 million was repatriated to the U.S.

Statement of operations for the six months ended June 30, 2019:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	399,893		$	1,892,803		$	(195	)	$	2,292,501
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	43			172,529			364,031			(143		)	536,460
Selling and marketing expense	746			113,676			718,648			(108		)	832,962
General and administrative expense	77,893			21,804			339,382			51			439,130
Product development expense	1,116			25,390			140,803			5			167,314
Depreciation	810			5,836			33,416			—			40,062
Amortization of intangibles	—			5,025			37,365			—			42,390
Total operating costs and expenses	80,608			344,260			1,633,645			(195		)	2,058,318
Operating (loss) income	(80,608		)	55,633			259,158			—			234,183
Equity in earnings of unconsolidated affiliates	261,437			5,610			—			(267,047		)	—
Interest expense	(848		)	—			(67,501		)	—			(68,349		)
Other (expense) income, net	(9,698		)	26,592			53,175			(23,446		)	46,623
Earnings before income taxes	170,283			87,835			244,832			(290,493		)	212,457
Income tax benefit (provision)	31,879			(9,259		)	24,699			—			47,319
Net earnings	202,162			78,576			269,531			(290,493		)	259,776
Net earnings attributable to noncontrolling interests	—			—			(57,614		)	—			(57,614		)
Net earnings attributable to IAC shareholders	$	202,162		$	78,576		$	211,917		$	(290,493	)	$	202,162
Comprehensive income attributable to IAC shareholders	$	204,248		$	78,572		$	214,508		$	(293,080	)	$	204,248

Statement of operations for the six months ended June 30, 2018:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	420,853		$	1,633,500		$	(156	)	$	2,054,197
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	151			117,439			302,703			(107		)	420,186
Selling and marketing expense	402			170,440			601,731			(81		)	772,492
General and administrative expense	63,061			29,640			279,814			32			372,547
Product development expense	1,216			28,420			122,746			—			152,382
Depreciation	532			6,466			31,064			—			38,062
Amortization of intangibles	—			919			39,222			—			40,141
Total operating costs and expenses	65,362			353,324			1,377,280			(156		)	1,795,810
Operating (loss) income	(65,362		)	67,529			256,220			—			258,387
Equity in earnings of unconsolidated affiliates	354,852			4,727			—			(359,579		)	—
Interest expense	(852		)	—			(53,009		)	—			(53,861		)
Other (expense) income, net ^(a)	(10,411		)	349,087			155,960			(328,114		)	166,522
Earnings before income taxes	278,227			421,343			359,171			(687,693		)	371,048
Income tax benefit (provision)	11,208			(23,125		)	9,562			—			(2,355		)
Net earnings	289,435			398,218			368,733			(687,693		)	368,693
Net earnings attributable to noncontrolling interests	—			—			(79,258		)	—			(79,258		)
Net earnings attributable to IAC shareholders	$	289,435		$	398,218		$	289,475		$	(687,693	)	$	289,435
Comprehensive income attributable to IAC shareholders	$	280,348		$	398,265		$	278,664		$	(676,929	)	$	280,348

_____________________


^(a)	During the six months ended June 30, 2018, foreign cash of $326.0 million was repatriated to the U.S.

Statement of cash flows for the six months ended June 30, 2019:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities	$	(54,883	)	$	92,299		$	341,838		$	(23,446	)	$	355,808
Cash flows from investing activities:
Acquisitions, net of cash acquired	—			(7,215		)	(193,811		)	—			(201,026		)
Capital expenditures	(1,408		)	(14,104		)	(61,111		)	—			(76,623		)
Proceeds from maturities of marketable debt securities	138,500			—			25,000			—			163,500
Purchases of marketable debt securities	(39,740		)	—			—			—			(39,740		)
Net proceeds from the sale of businesses and investments	170			39			23,164			—			23,373
Other, net	—			(3,270		)	1,114			—			(2,156		)
Net cash provided by (used in) investing activities	97,522			(24,550		)	(205,644		)	—			(132,672		)
Cash flows from financing activities:
Proceeds from issuance of IAC debt	—			—			1,150,000			—			1,150,000
Purchase of exchangeable note hedges	—			—			(303,428		)	—			(303,428		)
Proceeds from issuance of warrants	166,520			—			—			—			166,520
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 payments on ANGI Homeservices Term Loan	—			—			(6,875		)	—			(6,875		)
Debt issuance costs	—			—			(26,361		)	—			(26,361		)
Purchase of Match Group treasury stock	—			—			(76,086		)	—			(76,086		)
Proceeds from the exercise of IAC stock options	9,767			—			—			—			9,767
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	(32,789		)	—			—			—			(32,789		)
Withholding taxes paid on behalf of Match Group and ANGI Homeservices employees on net settled stock-based awards	—			—			(164,710		)	—			(164,710		)
Purchase of noncontrolling interests	(3,182		)	—			(2,939		)	—			(6,121		)
Distribution to IAC pursuant to the ANGI tax sharing agreement	11,355			—			(11,355		)	—			—
Intercompany	921,515			(67,749		)	(877,212		)	23,446			—
Other, net	—			—			(3,719		)	—			(3,719		)
Net cash provided by (used in) financing activities	1,073,186			(67,749		)	(232,112		)	23,446			796,771
Total cash provided (used)	1,115,825			—			(95,918		)	—			1,019,907
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(2		)	—			363			—			361
Net increase (decrease) in cash, cash equivalents, and restricted cash	1,115,823			—			(95,555		)	—			1,020,268
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	$	2,133,905		$	—		$	1,020,048		$	—		$	3,153,953

Statement of cash flows for the six months ended June 30, 2018:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities	$	(24,698	)	$	418,153		$	314,884		$	(328,537	)	$	379,802
Cash flows from investing activities:
Acquisitions, net of cash acquired	(4,142		)	—			(13,371		)	—			(17,513		)
Capital expenditures	(2,200		)	(847		)	(36,649		)	—			(39,696		)
Proceeds from maturities of marketable debt securities	10,000			—			—			—			10,000
Purchases of marketable debt securities	(124,397		)	—			—			—			(124,397		)
Net proceeds from the sale of investments and businesses	408			—			27,132			—			27,540
Purchases of investments	(18,180		)	—			(13,000		)	—			(31,180		)
Other, net	(5,000		)	3,884			10,715			—			9,599
Net cash (used in) provided by investing activities	(143,511		)	3,037			(25,173		)	—			(165,647		)
Cash flows from financing activities:
Principal payments on ANGI Homeservices Term Loan	—			—			(6,875		)	—			(6,875		)
Debt issuance costs	—			—			(532		)	—			(532		)
Purchase of IAC treasury stock	(7,869		)										(7,869		)
Purchase of Match Group treasury stock	—			—			(73,943		)	—			(73,943		)
Proceeds from the exercise of IAC stock options	27,317			—			—			—			27,317
Proceeds from the exercise of Match Group and ANGI Homeservices stock options	—			—			2,125			—			2,125
Withholding taxes paid on behalf of IAC employees on net settled stock-based awards	(495		)	—			—			—			(495		)
Withholding taxes paid on behalf of Match Group and ANGI Homeservices employees on net settled stock-based awards	—			—			(136,727		)	—			(136,727		)
Purchase of noncontrolling interests	—			—			(877		)	—			(877		)
Intercompany	375,167			(421,190		)	(282,514		)	328,537			—
Other, net	2,311			—			(7,140		)	—			(4,829		)
Net cash provided by (used in) financing activities	396,431			(421,190		)	(506,483		)	328,537			(202,705		)
Total cash provided (used)	228,222			—			(216,772		)	—			11,450
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	11			—			33			—			44
Net increase (decrease) in cash, cash equivalents, and restricted cash	228,233			—			(216,739		)	—			11,494
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	$	813,872		$	—		$	831,304		$	—		$	1,645,176

SUBSEQUENT EVENTS	6 Months Ended
SUBSEQUENT EVENTS	Jun. 30, 2019
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On August 7, 2019, the Company announced its intention to explore the possibility of a distribution of its interests in MTCH and ANGI to its shareholders. No decisions have been made as to the details of, or whether to pursue or consummate, either such transaction. On July 24, 2019, the Company issued a notice that all outstanding 4.75% Senior Notes will be redeemed on August 23, 2019, which is prior to their maturity date of December 15, 2022. In July 2019, the Company completed the initial funding of its $250 million investment in Turo, a peer-to-peer car sharing marketplace; the remaining funding is expected to be completed in August 2019.

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	6 Months Ended
	Jun. 30, 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, OkCupid and Hinge, 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 securities of the same issuer; value is generally determined based on a market approach as of the transaction date. A security will be considered identical or similar if it has identical or similar rights to the equity securities held by the Company. The Company reviews its investments in equity securities without readily determinable fair values 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 investments in equity securities, which require judgment and the use of estimates. When our assessment indicates that the fair value of the investment is below its carrying value, the Company writes down the investment 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: the fair values of cash equivalents and marketable debt securities; the carrying value of accounts receivable, including the determination of the allowance for doubtful accounts; the determination of revenue reserves; the useful lives and recoverability of definite-lived intangible assets and property and equipment; the recoverability of goodwill and indefinite-lived intangible assets; the fair value of equity securities without readily determinable fair values; contingencies; 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.
General 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 8—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 six months ended June 30, 2019, the Company recognized $315.0 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 June 30, 2019 are $402.2 million and $1.4 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.
Certain Risks and Concentrations - Services Agreement with Google	Certain Risks and Concentrations—Services Agreement with Google A meaningful portion of the Company's revenue is attributable to a services agreement with Google (the "Services Agreement").
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. 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 2—Leases" for additional information on the adoption of ASC 842.
Reclassifications	Reclassifications Certain prior year amounts have been reclassified to conform to the current year presentation.

LEASES (Tables)

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Schedule of Supplemental Balance Sheet Information of Leases



Leases	Balance Sheet Classification	June 30, 2019
		(In thousands)
Assets:
Right-of-use assets	Right-of-use assets	$	180,290

Liabilities:
Current lease liabilities	Accrued expenses and other current liabilities	32,635
Long-term lease liabilities	Other long-term liabilities	201,708
Total lease liabilities		$	234,343

Schedule of Lease Cost and Other Information



	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
	(In thousands)
Other Information:
Right-of-use assets obtained in exchange for lease liabilities	$	24,888	$	53,158
Cash paid for amounts included in the measurement of lease liabilities	$	10,539	$	23,714



Lease Cost	Income Statement Classification	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
		(In thousands)
Fixed lease cost	Cost of revenue	$	1,131	$	2,206
Fixed lease cost	Selling and marketing expense	3,002		4,911
Fixed lease cost	General and administrative expense	9,400		16,590
Fixed lease cost	Product development expense	282		600
Total fixed lease cost ^(a)		13,815		24,307
Variable lease cost	Cost of revenue	107		264
Variable lease cost	Selling and marketing expense	366		670
Variable lease cost	General and administrative expense	1,884		3,688
Variable lease cost	Product development expense	45		99
Total variable lease cost		2,402		4,721
Net lease cost		$	16,217	$	29,028

_____________________

^(a)Includes approximately $1.7 million and $3.0 million of short-term lease cost and $0.5 million and $1.1 million of sublease income for the three and six months ended June 30, 2019, respectively.

Schedule of Maturities of Operating Lease Liabilities

Maturities of lease liabilities as of June 30, 2019 (in thousands)^(b):



Remainder of 2019	$	20,503
2020	45,081
2021	38,724
2022	31,829
2023	28,491
After 2023	249,573
Total	414,201
Less: Interest	179,858
Present value of lease liabilities	$	234,343

_____________________


^(b)	Lease payments exclude $1.1 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 as of June 30, 2019:



Remaining lease term	15.9 years
Discount rate	6.03	%

FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Marketable Securities

At June 30, 2019 and December 31, 2018, the fair value of marketable securities are as follows:



	June 30, 2019		December 31, 2018
	(In thousands)
Marketable equity securities	$	161,749	$	419
Available-for-sale marketable debt securities	—		123,246
Total marketable securities	$	161,749	$	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

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 June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(In thousands)
Proceeds from maturities of available-for-sale marketable debt securities	$	40,000	$	5,000	$	163,500	$	10,000

Schedule of Realized and Unrealized Gains and Losses



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(In thousands)
Upward adjustments (gross unrealized gains)	$	—		$	128,786		$	—		$	128,786
Downward adjustments including impairment (gross unrealized losses)	(500		)	(2,396		)	(650		)	(2,588		)
Total	$	(500	)	$	126,390		$	(650	)	$	126,198



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(In thousands)
Realized gains, net, for equity securities sold	$	2,066	$	27,275	$	2,144	$	27,172
Unrealized gains, net, on equity securities held	29,369		126,414		29,247		126,559
Total gains recognized, net, in other income, net	$	31,435	$	153,689	$	31,391	$	153,731

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:



	June 30, 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	$	1,754,220	$	—	$	—		$	1,754,220
Treasury discount notes	—		711,877		—			711,877
Time deposits	—		145,036		—			145,036
Commercial paper	—		30,956		—			30,956
Marketable securities:
Marketable equity security	161,749		—		—			161,749
Total	$	1,915,969	$	887,869	$	—		$	2,803,838

Liabilities:
Contingent consideration arrangement	$	—	$	—	$	(29,803	)	$	(29,803	)



	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 June 30,
	2019			2018
	(In thousands)
Balance at April 1	$	(28,186	)	$	(1,965	)
Total net (losses) gains:
Included in earnings:
Fair value adjustments	(1,617		)	(54		)
Included in other comprehensive income	—			109
Balance at June 30	$	(29,803	)	$	(1,910	)



	Contingent Consideration Arrangements
	Six Months Ended June 30,
	2019			2018
	(In thousands)
Balance at January 1	$	(28,631	)	$	(2,647	)
Total net losses:
Included in earnings:
Fair value adjustments	(3,146		)	(210		)
Included in other comprehensive loss	(14		)	(1		)
Settlements	1,988			948
Balance at June 30	$	(29,803	)	$	(1,910	)

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:



	June 30, 2019						December 31, 2018
	Carrying Value			Fair Value			Carrying Value			Fair Value
	(In thousands)
Current portion of long-term debt	$	(13,750	)	$	(13,681	)	$	(13,750	)	$	(12,753	)
Long-term debt, net^(a)	(3,138,531		)	(3,914,422		)	(2,245,548		)	(2,460,204		)

_____________________

^(a)

At June 30, 2019 and December 31, 2018, the carrying value of long-term debt, net includes unamortized original issue discount and debt issuance costs of $429.1 million and $88.9 million, respectively.

LONG-TERM DEBT (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Schedule of Long-term Debt

Long-term debt consists of:



	June 30, 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	6,695		7,352
Less: unamortized debt issuance costs	15,698		11,737
Total MTCH debt, net	1,602,607		1,515,911

ANGI Debt:
ANGI Term Loan due November 5, 2023	254,375		261,250
Less: current portion of ANGI Term Loan	13,750		13,750
Less: unamortized debt issuance costs	2,268		2,529
Total ANGI debt, net	238,357		244,971

IAC Debt:
0.875% Exchangeable Senior Notes due October 1, 2022 (the "0.875% Exchangeable Notes due 2022"); 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
0.875% Exchangeable Senior Notes due June 15, 2026 (the "0.875% Exchangeable Notes due 2026"); interest payable each June 15 and December 15; commencing on December 15, 2019	575,000		—
2.00% Exchangeable Senior Notes due January 15, 2030 (the "2.00% Exchangeable Notes due 2030"); interest payable each January 15 and July 15; commencing on January 15, 2020	575,000		—
Total IAC long-term debt	1,701,989		551,989
Less: unamortized original issue discount	372,629		54,025
Less: unamortized debt issuance costs	31,793		13,298
Total IAC debt, net	1,297,567		484,666

Total long-term debt, net	$	3,138,531	$	2,245,548

Schedule of Maturities of Long-term Debt

Maturities of long-term debt as of June 30, 2019 (in thousands):



Remainder of 2019	$	6,875
2020	13,750
2021	13,750
2022	1,004,489
2023	192,500
After 2023	2,350,000
Total	3,581,364
Less: current portion of long-term debt	13,750
Less: unamortized original issue discount	379,324
Less: unamortized debt issuance costs	49,759
Total long-term debt, net	$	3,138,531

- 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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 835
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Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2019
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Debt Securities			Accumulated Other Comprehensive (Loss) Income
	(In thousands)
Balance as of April 1	$	(126,725	)	$	6		$	(126,719	)
Other comprehensive income (loss)	1,097			(6		)	1,091
Net current period other comprehensive income (loss)	1,097			(6		)	1,091
Allocation of accumulated other comprehensive loss related to the noncontrolling interests	(77		)	—			(77		)
Balance as of June 30	$	(125,705	)	$	—		$	(125,705	)



	Three Months Ended June 30, 2018
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Debt Securities		Accumulated Other Comprehensive Loss
	(In thousands)
Balance as of April 1	$	(74,950	)	$	—	$	(74,950	)
Other comprehensive (loss) income before reclassifications	(37,266		)	13		(37,253		)
Amounts reclassified to earnings	(191		)	—		(191		)
Net current period other comprehensive (loss) income	(37,457		)	13		(37,444		)
Allocation of accumulated other comprehensive loss related to the noncontrolling interests	(323		)	—		(323		)
Balance as of June 30	$	(112,730	)	$	13	$	(112,717	)



	Six Months Ended June 30, 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 (loss)	2,090			(4		)	2,086
Net current period other comprehensive income (loss)	2,090			(4		)	2,086
Allocation of accumulated other comprehensive income related to the noncontrolling interests	931			—			931
Balance as of June 30	$	(125,705	)	$	—		$	(125,705	)



	Six Months Ended June 30, 2018
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Debt Securities		Accumulated Other Comprehensive Loss
	(In thousands)
Balance as of January 1	$	(103,568	)	$	—	$	(103,568	)
Other comprehensive (loss) income before reclassifications	(9,048		)	13		(9,035		)
Amounts reclassified to earnings	(52		)	—		(52		)
Net current period other comprehensive (loss) income	(9,100		)	13		(9,087		)
Allocation of accumulated other comprehensive loss related to the noncontrolling interests	(62		)	—		(62		)
Balance as of June 30	$	(112,730	)	$	13	$	(112,717	)

EARNINGS PER SHARE (Tables)

6 Months Ended

Jun. 30, 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 June 30,
	2019						2018
	Basic			Diluted			Basic			Diluted
	(In thousands, except per share data)
Numerator:
Net earnings	$	146,791		$	146,791		$	280,854		$	280,854
Net earnings attributable to noncontrolling interests	(33,324		)	(33,324		)	(62,501		)	(62,501		)
Impact from publicly-traded subsidiaries' dilutive securities ^(a)	—			(6,136		)	—			(6,994		)
Net earnings attributable to IAC shareholders	$	113,467		$	107,331		$	218,353		$	211,359

Denominator:
Weighted average basic shares outstanding	84,139			84,139			83,604			83,604
Dilutive securities^{(a) (b) (c) (d)}	—			5,965			—			7,330
Denominator for earnings per share—weighted average shares ^{(a) (b) (c) (d)}	84,139			90,104			83,604			90,934

Earnings per share attributable to IAC shareholders:
Earnings per share	$	1.35		$	1.19		$	2.61		$	2.32



	Six Months Ended June 30,
	2019						2018
	Basic			Diluted			Basic			Diluted
	(In thousands, except per share data)
Numerator:
Net earnings	$	259,776		$	259,776		$	368,693		$	368,693
Net earnings attributable to noncontrolling interests	(57,614		)	(57,614		)	(79,258		)	(79,258		)
Impact from publicly-traded subsidiaries' dilutive securities ^(a)	—			(12,832		)	—			(12,569		)
Net earnings attributable to IAC shareholders	$	202,162		$	189,330		$	289,435		$	276,866

Denominator:
Weighted average basic shares outstanding	84,023			84,023			83,296			83,296
Dilutive securities ^{(a) (b) (c) (d)}	—			6,205			—			7,438
Denominator for earnings per share—weighted average shares ^{(a) (b) (c) (d)}	84,023			90,228			83,296			90,734

Earnings per share attributable to IAC shareholders:
Earnings per share	$	2.41		$	2.10		$	3.47		$	3.05

_____________________


^(a)	IAC has the option to settle certain MTCH and ANGI stock-based awards in its shares. For the three and six months ended June 30, 2019, it is more dilutive for IAC to settle certain ANGI equity awards and MTCH to settle certain MTCH equity awards. For the three and six months ended June 30, 2018, it is more dilutive for IAC to settle certain MTCH and ANGI equity awards.

^(b)

^(c)

^(d)

SEGMENT INFORMATION (Tables)

6 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

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



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(In thousands)
Operating Income (Loss):
Match Group	$	172,898		$	150,165		$	291,726		$	262,398
ANGI Homeservices	11,403			23,262			7,762			12,506
Vimeo	(11,616		)	(9,593		)	(29,400		)	(19,341		)
Dotdash	7,010			1,339			10,057			4,530
Applications	20,967			33,077			46,323			58,538
Emerging & Other	(1,789		)	6,079			(4,309		)	12,572
Corporate	(44,563		)	(35,892		)	(87,976		)	(72,816		)
Total	$	154,310		$	168,437		$	234,183		$	258,387



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(In thousands)
Adjusted EBITDA^(a):
Match Group	$	203,522		$	175,561		$	358,589		$	313,302
ANGI Homeservices	$	51,432		$	66,979		$	88,611		$	103,619
Vimeo	$	(9,464	)	$	(7,631	)	$	(25,664	)	$	(15,415	)
Dotdash	$	8,375		$	1,994		$	15,525		$	5,843
Applications	$	25,319		$	35,404		$	55,007		$	62,156
Emerging & Other	$	(1,517	)	$	8,290		$	(3,612	)	$	16,498
Corporate	$	(18,586	)	$	(15,552	)	$	(38,806	)	$	(32,560	)

_____________________

^(a)

The following table presents revenue by reportable segment:



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
	(In thousands)
Revenue:
Match Group	$	497,973		$	421,196		$	962,598		$	828,563
ANGI Homeservices	343,896			294,822			647,339			550,133
Vimeo	45,713			39,560			89,294			75,128
Dotdash	37,728			30,757			71,689			60,788
Applications	132,937			143,074			276,486			275,061
Emerging & Other	128,542			129,796			245,290			264,681
Inter-segment eliminations	(131		)	(83		)	(195		)	(157		)
Total	$	1,186,658		$	1,059,122		$	2,292,501		$	2,054,197

Schedule of Disaggregation of Revenue

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(In thousands)
Match Group
Direct revenue:
North America	$	251,499	$	222,163	$	489,272	$	433,520
International	235,801		185,564		451,990		366,944
Total Direct revenue	487,300		407,727		941,262		800,464
Indirect revenue (principally advertising revenue)	10,673		13,469		21,336		28,099
Total Match Group revenue	$	497,973	$	421,196	$	962,598	$	828,563

ANGI Homeservices
Marketplace:
Consumer connection revenue	$	241,236	$	187,172	$	442,818	$	336,232
Membership subscription revenue	16,485		16,565		33,002		32,192
Other revenue	1,807		998		3,633		1,919
Total Marketplace revenue	259,528		204,735		479,453		370,343
Advertising and other revenue	64,872		72,770		126,941		143,188
Total North America revenue	324,400		277,505		606,394		513,531
Consumer connection revenue	15,232		12,496		32,355		26,863
Membership subscription revenue	3,613		4,517		7,355		9,188
Advertising and other revenue	651		304		1,235		551
Total Europe revenue	19,496		17,317		40,945		36,602
Total ANGI Homeservices revenue	$	343,896	$	294,822	$	647,339	$	550,133

Vimeo
Platform revenue	$	45,713	$	36,293	$	87,015	$	69,225
Hardware revenue	—		3,267		2,279		5,903



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(In thousands)
Total Vimeo revenue	$	45,713	$	39,560	$	89,294	$	75,128

Dotdash
Advertising revenue	$	29,005	$	24,552	$	55,013	$	47,765
Affiliate commerce commission and other revenue	8,723		6,205		16,676		13,023
Total Dotdash revenue	$	37,728	$	30,757	$	71,689	$	60,788

Applications
Desktop:
Advertising revenue:
Google advertising revenue	$	78,085	$	107,550	$	166,135	$	216,127
Other advertising revenue	2,846		2,112		6,194		3,807
Total advertising revenue	80,931		109,662		172,329		219,934
Subscription and other revenue	3,908		4,768		8,496		12,084
Total Desktop revenue	84,839		114,430		180,825		232,018
Mosaic Group:
Subscription and other revenue	45,680		23,521		90,828		32,530
Advertising revenue	2,418		5,123		4,833		10,513
Total Mosaic Group revenue	48,098		28,644		95,661		43,043
Total Applications revenue	$	132,937	$	143,074	$	276,486	$	275,061

Emerging & Other
Advertising revenue:
Google advertising revenue	$	105,325	$	88,355	$	201,598	$	181,106
Other advertising revenue	8,299		16,799		15,276		30,068
Total advertising revenue	113,624		105,154		216,874		211,174
Other revenue	14,918		24,642		28,416		53,507
Total Emerging & Other revenue	$	128,542	$	129,796	$	245,290	$	264,681

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 June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(In thousands)
Revenue:
United States	$	774,095	$	708,571	$	1,486,476	$	1,366,151
All other countries	412,563		350,551		806,025		688,046
Total	$	1,186,658	$	1,059,122	$	2,292,501	$	2,054,197



	June 30, 2019		December 31, 2018
	(In thousands)
Long-lived assets (excluding goodwill and intangible assets):
United States	$	334,439	$	289,756
All other countries	27,111		29,044
Total	$	361,550	$	318,800

Schedule of Reconciliation of Operating Income to Adjusted EBITDA

The following tables reconcile operating income (loss) to Adjusted EBITDA for the Company's reportable segments:



	Three Months Ended June 30, 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	$	172,898		$	22,015	$	8,197	$	412	$	—	$	203,522
ANGI Homeservices	11,403			$	17,520	$	8,796	$	13,713	$	—	$	51,432
Vimeo	(11,616		)	$	—	$	132	$	2,020	$	—	$	(9,464	)
Dotdash	7,010			$	—	$	218	$	1,147	$	—	$	8,375
Applications	20,967			$	—	$	389	$	2,346	$	1,617	$	25,319
Emerging & Other	(1,789		)	$	—	$	272	$	—	$	—	$	(1,517	)
Corporate	(44,563		)	$	22,890	$	3,087	$	—	$	—	$	(18,586	)
Operating income	154,310
Interest expense	(37,206		)
Other income, net	45,972
Earnings before income taxes	163,076
Income tax provision	(16,285		)
Net earnings	146,791
Net earnings attributable to noncontrolling interests	(33,324		)
Net earnings attributable to IAC shareholders	$	113,467



	Three Months Ended June 30, 2018
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	150,165		$	16,706	$	8,399	$	237	$	54	$	175,561
ANGI Homeservices	23,262			$	22,053	$	5,886	$	15,778	$	—	$	66,979
Vimeo	(9,593		)	$	—	$	321	$	1,641	$	—	$	(7,631	)
Dotdash	1,339			$	—	$	246	$	409	$	—	$	1,994
Applications	33,077			$	—	$	773	$	1,554	$	—	$	35,404
Emerging & Other	6,079			$	1,293	$	349	$	569	$	—	$	8,290
Corporate	(35,892		)	$	17,509	$	2,831	$	—	$	—	$	(15,552	)
Operating income	168,437
Interest expense	(27,356		)
Other income, net	171,141
Earnings before income taxes	312,222
Income tax provision	(31,368		)
Net earnings	280,854
Net earnings attributable to noncontrolling interests	(62,501		)
Net earnings attributable to IAC shareholders	$	218,353



	Six Months Ended June 30, 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	$	291,726		$	50,012	$	16,028	$	823	$	—	$	358,589
ANGI Homeservices	7,762			$	36,802	$	15,795	$	28,252	$	—	$	88,611
Vimeo	(29,400		)	$	—	$	325	$	3,411	$	—	$	(25,664	)
Dotdash	10,057			$	—	$	444	$	5,024	$	—	$	15,525
Applications	46,323			$	—	$	808	$	4,730	$	3,146	$	55,007
Emerging & Other	(4,309		)	$	—	$	547	$	150	$	—	$	(3,612	)
Corporate	(87,976		)	$	43,055	$	6,115	$	—	$	—	$	(38,806	)
Operating income	234,183
Interest expense	(68,349		)
Other income, net	46,623
Earnings before income taxes	212,457
Income tax benefit	47,319
Net earnings	259,776
Net earnings attributable to noncontrolling interests	(57,614		)
Net earnings attributable to IAC shareholders	$	202,162



	Six Months Ended June 30, 2018
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	262,398		$	33,669	$	16,546	$	479	$	210	$	313,302
ANGI Homeservices	12,506			$	46,959	$	12,070	$	32,084	$	—	$	103,619
Vimeo	(19,341		)	$	—	$	656	$	3,270	$	—	$	(15,415	)
Dotdash	4,530			$	—	$	495	$	818	$	—	$	5,843
Applications	58,538			$	—	$	1,528	$	2,090	$	—	$	62,156
Emerging & Other	12,572			$	1,424	$	1,102	$	1,400	$	—	$	16,498
Corporate	(72,816		)	$	34,591	$	5,665	$	—	$	—	$	(32,560	)
Operating income	258,387
Interest expense	(53,861		)
Other income, net	166,522
Earnings before income taxes	371,048
Income tax provision	(2,355		)
Net earnings	368,693
Net earnings attributable to noncontrolling interests	(79,258		)
Net earnings attributable to IAC shareholders	$	289,435

CONSOLIDATED FINANCIAL STATEMENT DETAILS (Tables)

6 Months Ended

Jun. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Cash and Cash Equivalents



	June 30, 2019		December 31, 2018		June 30, 2018		December 31, 2017
	(In thousands)
Cash and cash equivalents	$	3,151,959	$	2,131,632	$	1,644,829	$	1,630,809
Restricted cash included in other current assets	1,574		1,633		347		2,873
Restricted cash included in other non-current assets	420		420		—		—
Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows	$	3,153,953	$	2,133,685	$	1,645,176	$	1,633,682

Schedule of Restricted Cash



	June 30, 2019		December 31, 2018		June 30, 2018		December 31, 2017
	(In thousands)
Cash and cash equivalents	$	3,151,959	$	2,131,632	$	1,644,829	$	1,630,809
Restricted cash included in other current assets	1,574		1,633		347		2,873
Restricted cash included in other non-current assets	420		420		—		—
Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows	$	3,153,953	$	2,133,685	$	1,645,176	$	1,633,682

Schedule of Other (Expense) Income, Net

Other income, net



	Three Months Ended June 30,		Six Months Ended June 30,
	2019	2018	2019	2018
	(In thousands)
Other income, net	$45,972	$171,141	$46,623	$166,522

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Tables)

6 Months Ended

Jun. 30, 2019

Condensed Financial Information Disclosure [Abstract]

Schedule of Condensed Balance Sheet

Balance sheet at June 30, 2019:



	IAC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			IAC Consolidated
	(In thousands)
Cash and cash equivalents	$	2,133,905	$	—	$	1,018,054	$	—		$	3,151,959
Marketable securities	—		—		161,749		—			161,749
Accounts receivable, net of allowance and reserves	—		90,545		274,950		—			365,495
Other current assets	24,852		38,163		172,650		(781		)	234,884
Intercompany receivables	—		1,414,117		133,953		(1,548,070		)	—
Right-of-use assets	10,861		40,151		155,833		(26,555		)	180,290
Property and equipment, net of accumulated depreciation and amortization	6,962		171,593		182,995		—			361,550
Goodwill	—		412,009		2,480,953		—			2,892,962
Intangible assets, net of accumulated amortization	—		43,712		584,706		—			628,418
Investment in subsidiaries	2,132,545		427,476		—		(2,560,021		)	—
Other non-current assets	294,891		88,523		97,554		(159,170		)	321,798
Total assets	$	4,604,016	$	2,726,289	$	5,263,397	$	(4,294,597	)	$	8,299,105

Current portion of long-term debt	$	—	$	—	$	13,750	$	—		$	13,750
Accounts payable, trade	2,079		43,999		58,314		—			104,392
Other current liabilities	25,552		83,694		731,436		(5,362		)	835,320
Long-term debt, net	34,291		—		3,104,240		—			3,138,531
Income taxes payable	—		1,612		34,921		—			36,533
Intercompany liabilities	1,548,070		—		—		(1,548,070		)	—
Other long-term liabilities	10,563		54,227		362,834		(181,144		)	246,480
Redeemable noncontrolling interests	—		—		80,502		—			80,502
Shareholders' equity	2,983,461		2,542,757		17,264		(2,560,021		)	2,983,461
Noncontrolling interests	—		—		860,136		—			860,136
Total liabilities and shareholders' equity	$	4,604,016	$	2,726,289	$	5,263,397	$	(4,294,597	)	$	8,299,105

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 June 30, 2019:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	200,963		$	985,825		$	(130	)	$	1,186,658
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	19			90,383			186,065			(78		)	276,389
Selling and marketing expense	384			55,710			355,086			(78		)	411,102
General and administrative expense	39,634			11,270			174,589			21			225,514
Product development expense	469			13,353			64,787			5			78,614
Depreciation	432			2,914			17,745			—			21,091
Amortization of intangibles	—			1,148			18,490			—			19,638
Total operating costs and expenses	40,938			174,778			816,762			(130		)	1,032,348
Operating (loss) income	(40,938		)	26,185			169,063			—			154,310
Equity in earnings of unconsolidated affiliates	145,997			4,542			—			(150,539		)	—
Interest expense	(424		)	—			(36,782		)	—			(37,206		)
Other (expense) income, net	(7,801		)	12,741			52,755			(11,723		)	45,972
Earnings before income taxes	96,834			43,468			185,036			(162,262		)	163,076
Income tax benefit (provision)	16,633			(4,136		)	(28,782		)	—			(16,285		)
Net earnings	113,467			39,332			156,254			(162,262		)	146,791
Net earnings attributable to noncontrolling interests	—			—			(33,324		)	—			(33,324		)
Net earnings attributable to IAC shareholders	$	113,467		$	39,332		$	122,930		$	(162,262	)	$	113,467
Comprehensive income attributable to IAC shareholders	$	114,558		$	39,117		$	124,408		$	(163,525	)	$	114,558

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



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	207,964		$	851,240		$	(82	)	$	1,059,122
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	75			61,215			156,991			(57		)	218,224
Selling and marketing expense	189			80,302			289,205			(36		)	369,660
General and administrative expense	31,652			14,259			142,441			11			188,363
Product development expense	564			14,151			60,730			—			75,445
Depreciation	266			3,126			15,413			—			18,805
Amortization of intangibles	—			410			19,778			—			20,188
Total operating costs and expenses	32,746			173,463			684,558			(82		)	890,685
Operating (loss) income	(32,746		)	34,501			166,682			—			168,437
Equity in earnings of unconsolidated affiliates	252,102			5,054			—			(257,156		)	—
Interest expense	(423		)	—			(26,933		)	—			(27,356		)
Other income, net ^(a)	6,436			62,204			153,770			(51,269		)	171,141
Earnings before income taxes	225,369			101,759			293,519			(308,425		)	312,222
Income tax provision	(7,016		)	(12,159		)	(12,193		)	—			(31,368		)
Net earnings	218,353			89,600			281,326			(308,425		)	280,854
Net earnings attributable to noncontrolling interests	—			—			(62,501		)	—			(62,501		)
Net earnings attributable to IAC shareholders	$	218,353		$	89,600		$	218,825		$	(308,425	)	$	218,353
Comprehensive income attributable to IAC shareholders	$	180,909		$	89,304		$	173,337		$	(262,641	)	$	180,909

_____________________


^(a)	During the three months ended June 30, 2018, foreign cash of $50.0 million was repatriated to the U.S.

Statement of operations for the six months ended June 30, 2019:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	399,893		$	1,892,803		$	(195	)	$	2,292,501
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	43			172,529			364,031			(143		)	536,460
Selling and marketing expense	746			113,676			718,648			(108		)	832,962
General and administrative expense	77,893			21,804			339,382			51			439,130
Product development expense	1,116			25,390			140,803			5			167,314
Depreciation	810			5,836			33,416			—			40,062
Amortization of intangibles	—			5,025			37,365			—			42,390
Total operating costs and expenses	80,608			344,260			1,633,645			(195		)	2,058,318
Operating (loss) income	(80,608		)	55,633			259,158			—			234,183
Equity in earnings of unconsolidated affiliates	261,437			5,610			—			(267,047		)	—
Interest expense	(848		)	—			(67,501		)	—			(68,349		)
Other (expense) income, net	(9,698		)	26,592			53,175			(23,446		)	46,623
Earnings before income taxes	170,283			87,835			244,832			(290,493		)	212,457
Income tax benefit (provision)	31,879			(9,259		)	24,699			—			47,319
Net earnings	202,162			78,576			269,531			(290,493		)	259,776
Net earnings attributable to noncontrolling interests	—			—			(57,614		)	—			(57,614		)
Net earnings attributable to IAC shareholders	$	202,162		$	78,576		$	211,917		$	(290,493	)	$	202,162
Comprehensive income attributable to IAC shareholders	$	204,248		$	78,572		$	214,508		$	(293,080	)	$	204,248

Statement of operations for the six months ended June 30, 2018:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	420,853		$	1,633,500		$	(156	)	$	2,054,197
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	151			117,439			302,703			(107		)	420,186
Selling and marketing expense	402			170,440			601,731			(81		)	772,492
General and administrative expense	63,061			29,640			279,814			32			372,547
Product development expense	1,216			28,420			122,746			—			152,382
Depreciation	532			6,466			31,064			—			38,062
Amortization of intangibles	—			919			39,222			—			40,141
Total operating costs and expenses	65,362			353,324			1,377,280			(156		)	1,795,810
Operating (loss) income	(65,362		)	67,529			256,220			—			258,387
Equity in earnings of unconsolidated affiliates	354,852			4,727			—			(359,579		)	—
Interest expense	(852		)	—			(53,009		)	—			(53,861		)
Other (expense) income, net ^(a)	(10,411		)	349,087			155,960			(328,114		)	166,522
Earnings before income taxes	278,227			421,343			359,171			(687,693		)	371,048
Income tax benefit (provision)	11,208			(23,125		)	9,562			—			(2,355		)
Net earnings	289,435			398,218			368,733			(687,693		)	368,693
Net earnings attributable to noncontrolling interests	—			—			(79,258		)	—			(79,258		)
Net earnings attributable to IAC shareholders	$	289,435		$	398,218		$	289,475		$	(687,693	)	$	289,435
Comprehensive income attributable to IAC shareholders	$	280,348		$	398,265		$	278,664		$	(676,929	)	$	280,348

_____________________

^(a)

During the six months ended June 30, 2018, foreign cash of $326.0 million was repatriated to the U.S.

Schedule of Condensed Cash Flow Statement

Statement of cash flows for the six months ended June 30, 2019:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities	$	(54,883	)	$	92,299		$	341,838		$	(23,446	)	$	355,808
Cash flows from investing activities:
Acquisitions, net of cash acquired	—			(7,215		)	(193,811		)	—			(201,026		)
Capital expenditures	(1,408		)	(14,104		)	(61,111		)	—			(76,623		)
Proceeds from maturities of marketable debt securities	138,500			—			25,000			—			163,500
Purchases of marketable debt securities	(39,740		)	—			—			—			(39,740		)
Net proceeds from the sale of businesses and investments	170			39			23,164			—			23,373
Other, net	—			(3,270		)	1,114			—			(2,156		)
Net cash provided by (used in) investing activities	97,522			(24,550		)	(205,644		)	—			(132,672		)
Cash flows from financing activities:
Proceeds from issuance of IAC debt	—			—			1,150,000			—			1,150,000
Purchase of exchangeable note hedges	—			—			(303,428		)	—			(303,428		)
Proceeds from issuance of warrants	166,520			—			—			—			166,520
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 payments on ANGI Homeservices Term Loan	—			—			(6,875		)	—			(6,875		)
Debt issuance costs	—			—			(26,361		)	—			(26,361		)
Purchase of Match Group treasury stock	—			—			(76,086		)	—			(76,086		)
Proceeds from the exercise of IAC stock options	9,767			—			—			—			9,767
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	(32,789		)	—			—			—			(32,789		)
Withholding taxes paid on behalf of Match Group and ANGI Homeservices employees on net settled stock-based awards	—			—			(164,710		)	—			(164,710		)
Purchase of noncontrolling interests	(3,182		)	—			(2,939		)	—			(6,121		)
Distribution to IAC pursuant to the ANGI tax sharing agreement	11,355			—			(11,355		)	—			—
Intercompany	921,515			(67,749		)	(877,212		)	23,446			—
Other, net	—			—			(3,719		)	—			(3,719		)
Net cash provided by (used in) financing activities	1,073,186			(67,749		)	(232,112		)	23,446			796,771
Total cash provided (used)	1,115,825			—			(95,918		)	—			1,019,907
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(2		)	—			363			—			361
Net increase (decrease) in cash, cash equivalents, and restricted cash	1,115,823			—			(95,555		)	—			1,020,268
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	$	2,133,905		$	—		$	1,020,048		$	—		$	3,153,953

Statement of cash flows for the six months ended June 30, 2018:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities	$	(24,698	)	$	418,153		$	314,884		$	(328,537	)	$	379,802
Cash flows from investing activities:
Acquisitions, net of cash acquired	(4,142		)	—			(13,371		)	—			(17,513		)
Capital expenditures	(2,200		)	(847		)	(36,649		)	—			(39,696		)
Proceeds from maturities of marketable debt securities	10,000			—			—			—			10,000
Purchases of marketable debt securities	(124,397		)	—			—			—			(124,397		)
Net proceeds from the sale of investments and businesses	408			—			27,132			—			27,540
Purchases of investments	(18,180		)	—			(13,000		)	—			(31,180		)
Other, net	(5,000		)	3,884			10,715			—			9,599
Net cash (used in) provided by investing activities	(143,511		)	3,037			(25,173		)	—			(165,647		)
Cash flows from financing activities:
Principal payments on ANGI Homeservices Term Loan	—			—			(6,875		)	—			(6,875		)
Debt issuance costs	—			—			(532		)	—			(532		)
Purchase of IAC treasury stock	(7,869		)										(7,869		)
Purchase of Match Group treasury stock	—			—			(73,943		)	—			(73,943		)
Proceeds from the exercise of IAC stock options	27,317			—			—			—			27,317
Proceeds from the exercise of Match Group and ANGI Homeservices stock options	—			—			2,125			—			2,125
Withholding taxes paid on behalf of IAC employees on net settled stock-based awards	(495		)	—			—			—			(495		)
Withholding taxes paid on behalf of Match Group and ANGI Homeservices employees on net settled stock-based awards	—			—			(136,727		)	—			(136,727		)
Purchase of noncontrolling interests	—			—			(877		)	—			(877		)
Intercompany	375,167			(421,190		)	(282,514		)	328,537			—
Other, net	2,311			—			(7,140		)	—			(4,829		)
Net cash provided by (used in) financing activities	396,431			(421,190		)	(506,483		)	328,537			(202,705		)
Total cash provided (used)	228,222			—			(216,772		)	—			11,450
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	11			—			33			—			44
Net increase (decrease) in cash, cash equivalents, and restricted cash	228,233			—			(216,739		)	—			11,494
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	$	813,872		$	—		$	831,304		$	—		$	1,645,176

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Revenue and Other [Line Items]
Current deferred revenue	$ 402,218		$ 402,218			$ 360,015
Noncurrent deferred revenue	1,400		1,400			1,700
Deferred revenue recognized during period			315,000
Noncurrent capitalized sales commissions	40,800		40,800			40,500
Revenue	1,186,658	$ 1,059,122	2,292,501	$ 2,054,197
Accounts receivable, net of allowance and reserves	365,495		365,495			279,189
Goodwill	2,892,962		2,892,962			2,726,859
Intangible assets, net of accumulated amortization	628,418		628,418			631,422
Right of use operating lease assets	180,290		180,290			0
Lease liability	234,343		234,343
Google Inc. \| Revenue \| Customer concentration risk
Revenue and Other [Line Items]
Revenue	$ 196,400	$ 204,900	392,300	$ 416,200
Concentration risk (as a percent)	17.00%	19.00%		20.00%
Google Inc. \| Revenue \| Customer concentration risk \| Applications
Revenue and Other [Line Items]
Revenue	$ 78,100	$ 107,400	166,100	$ 215,900
Google Inc. \| Revenue \| Customer concentration risk \| Emerging & Other
Revenue and Other [Line Items]
Revenue	104,000	$ 82,600	198,200	$ 168,400
Google Inc. \| Accounts Receivable \| Customer concentration risk
Revenue and Other [Line Items]
Accounts receivable, net of allowance and reserves	$ 73,200		$ 73,200			$ 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%		80.40%
Voting interest (as a percent)	97.50%		97.50%
ANGI Homeservices
Revenue and Other [Line Items]
Economic interest (as a percent)	83.10%		83.10%
Voting interest (as a percent)	98.00%		98.00%
Desktop \| Applications
Revenue and Other [Line Items]
Proportion of fair value in excess of carrying value (as a percent)	10.00%		10.00%
Goodwill	$ 265,100		$ 265,100
Intangible assets, net of accumulated amortization	$ 28,900		$ 28,900

LEASES - Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets:
Right-of-use assets	$ 180,290	$ 0
Liabilities:
Current lease liabilities	32,635
Long-term lease liabilities	201,708
Total lease liabilities	$ 234,343

LEASES - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
LEASES - Lease Cost (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Fixed lease cost	$ 13,815	$ 24,307
Variable lease cost	2,402	4,721
Net lease cost	16,217	29,028
Short-term lease cost	1,700	3,000
Sublease income	500	1,100
Cost of revenue
Lessee, Lease, Description [Line Items]
Fixed lease cost	1,131	2,206
Variable lease cost	107	264
Selling and marketing expense
Lessee, Lease, Description [Line Items]
Fixed lease cost	3,002	4,911
Variable lease cost	366	670
General and administrative expense
Lessee, Lease, Description [Line Items]
Fixed lease cost	9,400	16,590
Variable lease cost	1,884	3,688
Product development expense
Lessee, Lease, Description [Line Items]
Fixed lease cost	282	600
Variable lease cost	$ 45	$ 99

LEASES - Operating Lease Liabilities Maturities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Leases [Abstract]
2020	$ 20,503
2021	45,081
2022	38,724
2023	31,829
2024	28,491
After 2023	249,573
Total	414,201
Less: Interest	179,858
Present value of lease liabilities	234,343
Leases signed but not yet commenced	$ 1,100

LEASES - Weighted-Average Remaining Term and Discount Rate (Details)	Jun. 30, 2019
Leases [Abstract]
Remaining lease term	15 years 10 months 24 days
Discount rate (as a percent)	6.03%

LEASES - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Other Information:
Right-of-use assets obtained in exchange for lease liabilities	$ 24,888	$ 53,158
Cash paid for amounts included in the measurement of lease liabilities	$ 10,539	$ 23,714

INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 16,285	$ 31,368	$ (47,319)	$ 2,355
Effective income tax rate (as a percent)		10.00%		1.00%
Unrecognized tax benefits including interest and penalties	52,000		52,000		$ 52,300
Unrecognized tax benefit, if subsequently recognized would reduce income tax expense	48,600		48,600		$ 49,100
Decrease in unrecognized tax benefit, reasonably possible within twelve months	24,000		24,000
Decrease in unrecognized tax benefit, reasonably possible within twelve months which would reduce the income tax provision	$ 23,500		$ 23,500

FINANCIAL INSTRUMENTS - Narrative (Details)	3 Months Ended			6 Months Ended
FINANCIAL INSTRUMENTS - Narrative (Details)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Feb. 15, 2019	Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gain (loss) on marketable equity security	$ 29,800,000			$ 29,800,000
Gross realized gains			$ 0	0	$ 0
Gross realized losses	0		$ 0	0	$ 0
Assets measured at fair value on a nonrecurring basis
Equity securities without readily determinable fair values	102,000,000.0			102,000,000.0			$ 235,100,000
Marketable securities	161,749,000			161,749,000			123,665,000
Total upward adjustments to equity securities without readily determinable fair value	200,000			200,000
Total downward adjustments to equity securities without readily determinable fair value	(2,700,000)			(2,700,000)
Contingent Consideration Arrangements
Contingent consideration, maximum amount at balance sheet date	45,000,000.0			45,000,000.0
Contingent consideration, fair value at balance sheet date with a maximum limit	44,000,000.0			44,000,000.0
Payment for contingent consideration arrangement		$ 2,000,000.0
Contingent consideration, at fair value, current	12,600,000			12,600,000			2,000,000.0
Contingent consideration, at fair value, noncurrent	17,200,000			17,200,000			26,600,000
Match Group
Contingent Consideration Arrangements
Long-term debt	1,625,000,000			1,625,000,000			1,535,000,000
Match Group \| Credit Facility \| MTCH Credit Facility due December 7, 2023
Contingent Consideration Arrangements
Face amount of debt instrument							500,000,000
Long-term debt	0			0			260,000,000
Match Group \| Senior Notes \| 5.625% MTCH Senior Notes
Contingent Consideration Arrangements
Long-term debt	$ 350,000,000			$ 350,000,000			$ 0
Stated interest rate (as a percent)	5.625%			5.625%		5.625%
Measurement Input, Discount Rate \| Contingent Consideration Arrangements
Contingent Consideration Arrangements
Contingent consideration, discount rates (as a percent)	0.25			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	Jun. 30, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Marketable equity securities	$ 161,749	$ 419
Available-for-sale marketable debt securities	0	123,246
Total marketable securities	$ 161,749	$ 123,665

FINANCIAL INSTRUMENTS - Current Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Marketable Securities
Amortized Cost		$ 123,246
Gross Unrealized Gains		3
Gross Unrealized Losses		(3)
Fair Value	$ 0	123,246
Treasury discount notes
Schedule of Available-for-sale Marketable Securities
Amortized Cost		112,291
Gross Unrealized Gains		3
Gross Unrealized Losses		(3)
Fair Value		112,291
Commercial paper
Schedule of Available-for-sale Marketable Securities
Amortized Cost		10,955
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		$ 10,955

FINANCIAL INSTRUMENTS - Proceeds from Maturities and Sales of Current Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Proceeds from maturities of available-for-sale marketable debt securities	$ 40,000	$ 5,000	$ 163,500	$ 10,000

FINANCIAL INSTRUMENTS - Realized and Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Adjustments to Carrying Value of Non-Marketable Equity Securities [Abstract]
Upward adjustments (gross unrealized gains)	$ 0	$ 128,786	$ 0	$ 128,786
Downward adjustments including impairment (gross unrealized losses)	(500)	(2,396)	(650)	(2,588)
Total	(500)	126,390	(650)	126,198
Adjustments to Carrying Value of Non-Marketable Equity Securities [Abstract]
Realized gains, net, for equity securities sold	2,066	27,275	2,144	27,172
Unrealized gains, net, on equity securities held	29,369	126,414	29,247	126,559
Total gains recognized, net, in other income, net	$ 31,435	$ 153,689	$ 31,391	$ 153,731

FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets:
Marketable securities	$ 0	$ 123,246
Marketable equity securities	161,749	419
Assets, Fair Value Disclosure	2,803,838	1,818,666
Liabilities:
Contingent consideration arrangement	(29,803)	(28,631)
Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Assets, Fair Value Disclosure	1,915,969	881,234
Liabilities:
Contingent consideration arrangement	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Assets, Fair Value Disclosure	887,869	937,432
Liabilities:
Contingent consideration arrangement	0	0
Significant Unobservable Inputs (Level 3)
Assets:
Assets, Fair Value Disclosure	0	0
Liabilities:
Contingent consideration arrangement	(29,803)	(28,631)
Money market funds
Assets:
Cash equivalents	1,754,220	880,815
Money market funds \| Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	1,754,220	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	711,877	561,733
Marketable securities		112,291
Treasury discount notes \| Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	0	0
Marketable securities		0
Treasury discount notes \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	711,877	561,733
Marketable securities		112,291
Treasury discount notes \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0	0
Marketable securities		0
Time deposits
Assets:
Cash equivalents	145,036	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	145,036	90,036
Time deposits \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0	0
Commercial paper
Assets:
Cash equivalents	30,956	162,417
Marketable securities		10,955
Commercial paper \| Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	0	0
Marketable securities		0
Commercial paper \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	30,956	162,417
Marketable securities		10,955
Commercial paper \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0	0
Marketable securities		0
Marketable equity security
Assets:
Marketable equity securities	161,749	419
Marketable equity security \| Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Marketable equity securities	161,749	419
Marketable equity security \| Significant Other Observable Inputs (Level 2)
Assets:
Marketable equity securities	0	0
Marketable equity security \| Significant Unobservable Inputs (Level 3)
Assets:
Marketable equity securities	$ 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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Contingent Consideration Arrangements
Balance at beginning of period	$ (28,186)	$ (1,965)	$ (28,631)	$ (2,647)
Fair value adjustments	(1,617)	(54)	(3,146)	(210)
Included in other comprehensive income	0	109	(14)	(1)
Settlements			1,988	948
Balance at end of period	$ (29,803)	$ (1,910)	$ (29,803)	$ (1,910)

FINANCIAL INSTRUMENTS - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 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	(3,138,531)	(2,245,548)
Unamortized original issue discount and debt issuance costs	429,100	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	(3,138,531)	(2,245,548)
Fair Value
Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current portion of long-term debt	(13,681)	(12,753)
Long-term debt, net of current portion	$ (3,914,422)	$ (2,460,204)

LONG-TERM DEBT - Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2019	May 21, 2019	Feb. 15, 2019	Dec. 31, 2018	Dec. 04, 2017	Oct. 02, 2017	Jun. 01, 2016
Debt Instrument [Line Items]
Less: unamortized original issue discount	$ 379,324
Less: current portion of long-term debt	13,750			$ 13,750
Less: unamortized debt issuance costs	49,759
Long-term debt, net	3,138,531			2,245,548
Senior Notes \| 0.875% Exchangeable Notes due 2022
Debt Instrument [Line Items]
Stated interest rate (as a percent)						0.875%
Senior Notes \| 0.875% Exchangeable Notes due 2026
Debt Instrument [Line Items]
Stated interest rate (as a percent)		0.875%
Senior Notes \| 2.00% Exchangeable Notes due 2030
Debt Instrument [Line Items]
Stated interest rate (as a percent)		2.00%
Match Group
Debt Instrument [Line Items]
Long-term debt	1,625,000			1,535,000
Less: unamortized original issue discount	6,695			7,352
Less: unamortized debt issuance costs	15,698			11,737
Long-term debt, net	1,602,607			1,515,911
Match Group \| Term Loan \| MTCH Term Loan due November 16, 2022
Debt Instrument [Line Items]
Long-term debt	425,000			425,000
Match Group \| Credit Facility \| MTCH Credit Facility due December 7, 2023
Debt Instrument [Line Items]
Long-term debt	0			260,000
Match Group \| Senior Notes \| 6.375% MTCH Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 400,000			400,000
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			450,000
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			0
Stated interest rate (as a percent)	5.625%		5.625%
ANGI Homeservices
Debt Instrument [Line Items]
Less: current portion of long-term debt	$ 13,750			13,750
Less: unamortized debt issuance costs	2,268			2,529
Long-term debt, net	238,357			244,971
ANGI Homeservices \| Term Loan \| ANGI Term Loan due November 5, 2023
Debt Instrument [Line Items]
Long-term debt	254,375			261,250
IAC
Debt Instrument [Line Items]
Long-term debt	1,701,989			551,989
Less: unamortized original issue discount	372,629			54,025
Less: unamortized debt issuance costs	31,793			13,298
Long-term debt, net	1,297,567			484,666
IAC \| Senior Notes \| 0.875% Exchangeable Notes due 2022
Debt Instrument [Line Items]
Long-term debt	517,500			517,500
Less: unamortized original issue discount	$ 47,300			54,000
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			34,489
Stated interest rate (as a percent)	4.75%
IAC \| Senior Notes \| 0.875% Exchangeable Notes due 2026
Debt Instrument [Line Items]
Long-term debt	$ 575,000			0
Less: unamortized original issue discount	$ 137,300
Stated interest rate (as a percent)	0.875%	0.875%
IAC \| Senior Notes \| 2.00% Exchangeable Notes due 2030
Debt Instrument [Line Items]
Long-term debt	$ 575,000			$ 0
Less: unamortized original issue discount	$ 188,100
Stated interest rate (as a percent)	2.00%	2.00%

LONG-TERM DEBT - Narrative (Details)					3 Months Ended		6 Months Ended		12 Months Ended			31 Months Ended
LONG-TERM DEBT - Narrative (Details)	May 21, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($)	Nov. 05, 2018 USD ($)	Oct. 02, 2017 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($)	Nov. 05, 2023 USD ($)	Nov. 05, 2022 USD ($)	Dec. 31, 2018 USD ($)	Nov. 05, 2021 USD ($)	Jun. 03, 2019 USD ($)	Feb. 15, 2019	Dec. 04, 2017	Jun. 01, 2016
Debt Instrument [Line Items]
Outstanding balance of debt instrument					$ 3,581,364,000		$ 3,581,364,000
Net unamortized discount (premium)					379,324,000		379,324,000
IAC
Debt Instrument [Line Items]
Net unamortized discount (premium)		$ 54,025,000			372,629,000		372,629,000				$ 54,025,000
IAC Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity					250,000,000		250,000,000
Borrowings outstanding of credit facility		$ 0			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]
Net unamortized discount (premium)		$ 7,352,000			6,695,000		$ 6,695,000				$ 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)							0.30%				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				$ 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				$ 517,500,000
Senior Notes \| 6.375% MTCH Senior Notes \| Maximum
Debt Instrument [Line Items]
Maximum leverage ratio							5.0
Senior Notes \| 0.875% Exchangeable Notes due 2022
Debt Instrument [Line Items]
Stated interest rate (as a percent)				0.875%
Exchange price per share (USD per share) \| $ / shares				$ 152.18
Senior Notes \| 0.875% Exchangeable Notes due 2022 \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)				0.875%	0.875%		0.875%
Outstanding balance of debt instrument		463,500,000			$ 470,200,000		$ 470,200,000				$ 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		3,400,000
Outstanding warrants (shares) \| shares					3,400,000		3,400,000
Exercise price of warrants (USD per share) \| $ / shares					$ 229.70		$ 229.70
If-converted value in excess of principal							$ 222,200,000				105,000,000.0
Interest expense					$ 5,400,000	$ 5,300,000	10,800,000	$ 10,500,000
Amortization of debt discount (premium)					3,400,000	3,300,000	6,800,000	6,500,000
Amortization of debt issuance costs					900,000	$ 800,000	1,700,000	$ 1,700,000
Net unamortized discount (premium)		54,000,000.0			$ 47,300,000		$ 47,300,000				54,000,000.0
Senior Notes \| 0.875% Exchangeable Notes due 2022 \| Maximum \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)					3.88%		3.88%
Senior Notes \| 0.875% Exchangeable Notes due 2022 \| Minimum \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)					0.875%		0.875%
Senior Notes \| 0.875% Exchangeable Notes due 2026 & 2.00% Exchangeable Notes due 2030 \| IAC
Debt Instrument [Line Items]
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%
Proceeds from issuance of debt after fees and expenses	$ 1,100,000,000
Exercise price of warrants (USD per share) \| $ / shares					$ 457.02		$ 457.02
Interest expense					$ 4,300,000		$ 4,300,000
Amortization of debt discount (premium)					2,600,000		2,600,000
Amortization of debt issuance costs					$ 200,000		$ 200,000
Net unamortized discount (premium)	$ (136,900,000)
Senior Notes \| 0.875% Exchangeable Notes due 2026
Debt Instrument [Line Items]
Stated interest rate (as a percent)	0.875%
Exchange price per share (USD per share) \| $ / shares	$ 302.77
Senior Notes \| 0.875% Exchangeable Notes due 2026 \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)	0.875%				0.875%		0.875%
Outstanding balance of debt instrument					$ 437,700,000		$ 437,700,000
Exchangeable stock (shares) \| shares	3.3028
Exchange price per share (USD per share) \| $ / shares	$ 302.77						$ 302.77
Amount of debt discount and increase to additional paid in capital	$ 138,800,000
Outstanding stock (shares) \| shares					1,900,000		1,900,000
Outstanding warrants (shares) \| shares					1,900,000		1,900,000
Face amount of debt instrument					$ 575,000,000.0		$ 575,000,000.0
Net unamortized discount (premium)					$ 137,300,000		$ 137,300,000
Senior Notes \| 0.875% Exchangeable Notes due 2026 \| Maximum \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)					4.98%		4.98%
Senior Notes \| 2.00% Exchangeable Notes due 2030
Debt Instrument [Line Items]
Stated interest rate (as a percent)	2.00%
Exchange price per share (USD per share) \| $ / shares	$ 291.35
Senior Notes \| 2.00% Exchangeable Notes due 2030 \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)	2.00%				2.00%		2.00%
Outstanding balance of debt instrument					$ 386,900,000		$ 386,900,000						$ 75,000,000
Exchangeable stock (shares) \| shares	3.4323
Exchange price per share (USD per share) \| $ / shares	$ 291.35						$ 291.35
Amount of debt discount and increase to additional paid in capital	$ 189,200,000
Outstanding stock (shares) \| shares					2,000,000.0		2,000,000.0
Outstanding warrants (shares) \| shares					2,000,000.0		2,000,000.0
Face amount of debt instrument					$ 575,000,000.0		$ 575,000,000.0
Net unamortized discount (premium)					$ 188,100,000		$ 188,100,000
Senior Notes \| 2.00% Exchangeable Notes due 2030 \| Maximum \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)					6.29%		6.29%
Senior Notes \| 4.75% Senior Notes \| IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)					4.75%		4.75%
Senior Notes \| Match Group \| 6.375% MTCH Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)					6.375%		6.375%									6.375%
Senior Notes \| Match Group \| 5.00% MTCH Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)					5.00%		5.00%								5.00%
Senior Notes \| Match Group \| 5.625% MTCH Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)					5.625%		5.625%							5.625%
Senior Notes \| IAC FinanceCo 2, Inc.& IAC FinanceCo 3, Inc. \| 0.875% Exchangeable Notes due 2026 & 2.00% Exchangeable Notes due 2030 \| IAC
Debt Instrument [Line Items]
Period of reported sale price of common stock (trading days)	20 days
Period of consecutive reported sale price of common stock (trading days)	30 days
Redemption price (as a percent)	100.00%
Exchange price on applicable trading day (as a percent)	130.00%
Term Loan \| Match Group \| MTCH Term Loan due November 16, 2022
Debt Instrument [Line Items]
Outstanding balance of debt instrument		425,000,000			$ 425,000,000.0		$ 425,000,000.0				$ 425,000,000
Basis spread on variable rate (as a percent)							4.90%				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		261,300,000			254,400,000		$ 254,400,000				$ 261,300,000
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									$ 260,000,000.0
Borrowings outstanding of credit facility					$ 0		$ 0
Effective interest rate (as a percent)		4.00%									4.00%
Face amount of debt instrument		$ 500,000,000									$ 500,000,000
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 - Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Remainder of 2019	$ 6,875
2020	13,750
2021	13,750
2022	1,004,489
2023	192,500
After 2023	2,350,000
Total	3,581,364
Less: current portion of long-term debt	13,750	$ 13,750
Less: unamortized original issue discount	379,324
Less: unamortized debt issuance costs	49,759
Total long-term debt, net	$ 3,138,531	$ 2,245,548

ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	$ 3,571,336,000	$ 3,082,391,000	$ 3,551,801,000	$ 2,946,823,000
Total other comprehensive income (loss), net of income taxes	1,091,000	(46,563,000)	2,401,000	(11,170,000)
Balance at end of period	3,843,597,000	3,236,948,000	3,843,597,000	3,236,948,000
Tax provision (benefit) on accumulated other comprehensive loss	0	0	0	0
Foreign Currency Translation Adjustment attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(126,725,000)	(74,950,000)	(128,726,000)	(103,568,000)
Balance at end of period	(125,705,000)	(112,730,000)	(125,705,000)	(112,730,000)
Foreign Currency Translation Adjustment including portion attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive income (loss)	1,097,000	(37,266,000)	2,090,000	(9,048,000)
Amounts reclassified to earnings		(191,000)		(52,000)
Total other comprehensive income (loss), net of income taxes	1,097,000	(37,457,000)	2,090,000	(9,100,000)
Foreign Currency Translation Adjustment attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Total other comprehensive income (loss), net of income taxes	(77,000)	(323,000)	931,000	(62,000)
Unrealized Gains on Available-for-Sale Debt Securities attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	6,000	0	4,000	0
Balance at end of period	0	13,000	0	13,000
Unrealized Gains on Available-for-Sale Debt Securities including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive income (loss)	(6,000)	13,000	(4,000)	13,000
Amounts reclassified to earnings		0		0
Total other comprehensive income (loss), net of income taxes	(6,000)	13,000	(4,000)	13,000
Unrealized Gains on Available-for-Sale Debt Securities attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Total other comprehensive income (loss), net of income taxes	0	0	0	0
Accumulated Other Comprehensive (Loss) Income attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(126,719,000)	(74,950,000)	(128,722,000)	(103,568,000)
Balance at end of period	(125,705,000)	(112,717,000)	(125,705,000)	(112,717,000)
Accumulated Other Comprehensive (Loss) Income including portion attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive income (loss)	1,091,000	(37,253,000)	2,086,000	(9,035,000)
Amounts reclassified to earnings		(191,000)		(52,000)
Total other comprehensive income (loss), net of income taxes	1,091,000	(37,444,000)	2,086,000	(9,087,000)
Accumulated Other Comprehensive (Loss) Income attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Total other comprehensive income (loss), net of income taxes	$ (77,000)	$ (323,000)	$ 931,000	$ (62,000)

EARNINGS PER SHARE - Summary (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	May 21, 2019	Oct. 02, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator: Basic
Net earnings			$ 146,791	$ 280,854	$ 259,776	$ 368,693
Net earnings attributable to noncontrolling interests			(33,324)	(62,501)	(57,614)	(79,258)
Net earnings attributable to IAC shareholders			113,467	218,353	202,162	289,435
Numerator: Diluted
Net earnings			146,791	280,854	259,776	368,693
Net earnings attributable to noncontrolling interests			(33,324)	(62,501)	(57,614)	(79,258)
Impact from public subsidiaries' dilutive securities			(6,136)	(6,994)	(12,832)	(12,569)
Net earnings attributable to IAC shareholders			$ 107,331	$ 211,359	$ 189,330	$ 276,866
Denominator: Basic
Weighted average basic shares outstanding (shares)			84,139,000	83,604,000	84,023,000	83,296,000
Denominator: Diluted
Weighted average basic shares outstanding (shares)			84,139,000	83,604,000	84,023,000	83,296,000
Dilutive securities (shares)			5,965,000	7,330,000	6,205,000	7,438,000
Denominator for earnings per share - weighted average shares (shares)			90,104,000	90,934,000	90,228,000	90,734,000
Earnings per share attributable to IAC shareholders: Basic
Basic earnings per share (USD per share)			$ 1.35	$ 2.61	$ 2.41	$ 3.47
Earnings per share attributable to IAC shareholders: Diluted
Diluted earnings per share (USD per share)			1.19	2.32	2.10	3.05
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average share price (USD per share)			$ 223.29	$ 153.21	$ 215.28	$ 150.39
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)			11,200,000	3,400,000		6,900,000
Market-based awards and PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares)			300,000	200,000		200,000
Senior Notes \| 0.875% Exchangeable Notes due 2022
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)			1,100,000	100,000	1,000,000.0
Exchange price per share (USD per share)		$ 152.18
Stated interest rate (as a percent)		0.875%
Senior Notes \| 0.875% Exchangeable Notes due 2026
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)					0
Exchange price per share (USD per share)	$ 302.77
Stated interest rate (as a percent)	0.875%
Senior Notes \| 2.00% Exchangeable Notes due 2030
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)			0		0
Exchange price per share (USD per share)	$ 291.35
Stated interest rate (as a percent)	2.00%

SEGMENT INFORMATION - Financial Data by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenue	$ 1,186,658	$ 1,059,122	$ 2,292,501	$ 2,054,197
Operating income (loss)	154,310	168,437	234,183	258,387
Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	497,973	421,196	962,598	828,563
Operating income (loss)	172,898	150,165	291,726	262,398
Adjusted EBITDA	203,522	175,561	358,589	313,302
Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	343,896	294,822	647,339	550,133
Operating income (loss)	11,403	23,262	7,762	12,506
Adjusted EBITDA	51,432	66,979	88,611	103,619
Operating segments \| Vimeo
Segment Reporting Information [Line Items]
Revenue	45,713	39,560	89,294	75,128
Operating income (loss)	(11,616)	(9,593)	(29,400)	(19,341)
Adjusted EBITDA	(9,464)	(7,631)	(25,664)	(15,415)
Operating segments \| Dotdash
Segment Reporting Information [Line Items]
Revenue	37,728	30,757	71,689	60,788
Operating income (loss)	7,010	1,339	10,057	4,530
Adjusted EBITDA	8,375	1,994	15,525	5,843
Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	132,937	143,074	276,486	275,061
Operating income (loss)	20,967	33,077	46,323	58,538
Adjusted EBITDA	25,319	35,404	55,007	62,156
Operating segments \| Emerging & Other
Segment Reporting Information [Line Items]
Revenue	128,542	129,796	245,290	264,681
Operating income (loss)	(1,789)	6,079	(4,309)	12,572
Adjusted EBITDA	(1,517)	8,290	(3,612)	16,498
Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenue	(131)	(83)	(195)	(157)
Corporate
Segment Reporting Information [Line Items]
Operating income (loss)	(44,563)	(35,892)	(87,976)	(72,816)
Adjusted EBITDA	$ (18,586)	$ (15,552)	$ (38,806)	$ (32,560)

SEGMENT INFORMATION - Revenue Disaggregated by Service (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenue	$ 1,186,658	$ 1,059,122	$ 2,292,501	$ 2,054,197
Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	497,973	421,196	962,598	828,563
Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	343,896	294,822	647,339	550,133
Operating segments \| Vimeo
Segment Reporting Information [Line Items]
Revenue	45,713	39,560	89,294	75,128
Operating segments \| Dotdash
Segment Reporting Information [Line Items]
Revenue	37,728	30,757	71,689	60,788
Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	132,937	143,074	276,486	275,061
Operating segments \| Applications \| Mosaic Group
Segment Reporting Information [Line Items]
Revenue	48,098	28,644	95,661	43,043
Operating segments \| Emerging & Other
Segment Reporting Information [Line Items]
Revenue	128,542	129,796	245,290	264,681
North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	324,400	277,505	606,394	513,531
International
Segment Reporting Information [Line Items]
Revenue	412,563	350,551	806,025	688,046
Europe \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	19,496	17,317	40,945	36,602
Direct revenue \| Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	487,300	407,727	941,262	800,464
Direct revenue \| North America \| Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	251,499	222,163	489,272	433,520
Direct revenue \| International \| Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	235,801	185,564	451,990	366,944
Indirect revenue \| Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	10,673	13,469	21,336	28,099
Marketplace revenue \| North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	259,528	204,735	479,453	370,343
Consumer connection revenue \| North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	241,236	187,172	442,818	336,232
Membership subscription revenue \| North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	16,485	16,565	33,002	32,192
Other revenue \| North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	1,807	998	3,633	1,919
Consumer connection revenue \| Europe \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	15,232	12,496	32,355	26,863
Membership subscription revenue \| Europe \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	3,613	4,517	7,355	9,188
Advertising and other revenue \| North America \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	64,872	72,770	126,941	143,188
Advertising and other revenue \| Europe \| Operating segments \| ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	651	304	1,235	551
Platform revenue \| Operating segments \| Vimeo
Segment Reporting Information [Line Items]
Revenue	45,713	36,293	87,015	69,225
Hardware revenue \| Operating segments \| Vimeo
Segment Reporting Information [Line Items]
Revenue	0	3,267	2,279	5,903
Advertising revenue \| Operating segments \| Dotdash
Segment Reporting Information [Line Items]
Revenue	29,005	24,552	55,013	47,765
Advertising revenue \| Operating segments \| Applications \| Mosaic Group
Segment Reporting Information [Line Items]
Revenue	2,418	5,123	4,833	10,513
Advertising revenue \| Operating segments \| Emerging & Other
Segment Reporting Information [Line Items]
Revenue	113,624	105,154	216,874	211,174
Google advertising revenue \| Operating segments \| Emerging & Other
Segment Reporting Information [Line Items]
Revenue	105,325	88,355	201,598	181,106
Other \| Operating segments \| Emerging & Other
Segment Reporting Information [Line Items]
Revenue	8,299	16,799	15,276	30,068
Affiliate commerce commission and other revenue \| Operating segments \| Dotdash
Segment Reporting Information [Line Items]
Revenue	8,723	6,205	16,676	13,023
Other revenue \| Operating segments \| Emerging & Other
Segment Reporting Information [Line Items]
Revenue	14,918	24,642	28,416	53,507
Subscription and other revenue \| Operating segments \| Applications \| Mosaic Group
Segment Reporting Information [Line Items]
Revenue	45,680	23,521	90,828	32,530
Desktop \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	84,839	114,430	180,825	232,018
Advertising revenue \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	80,931	109,662	172,329	219,934
Google advertising revenue \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	78,085	107,550	166,135	216,127
Other \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	2,846	2,112	6,194	3,807
Subscription and other revenue \| Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	$ 3,908	$ 4,768	$ 8,496	$ 12,084

SEGMENT INFORMATION - Geographic Information about Revenue and Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Revenue and long-lived assets by geography
Revenue	$ 1,186,658	$ 1,059,122	$ 2,292,501	$ 2,054,197
Property and equipment, net of accumulated depreciation and amortization	361,550		361,550		$ 318,800
United States
Revenue and long-lived assets by geography
Revenue	774,095	708,571	1,486,476	1,366,151
Property and equipment, net of accumulated depreciation and amortization	334,439		334,439		289,756
All other countries
Revenue and long-lived assets by geography
Revenue	412,563	$ 350,551	806,025	$ 688,046
Property and equipment, net of accumulated depreciation and amortization	$ 27,111		$ 27,111		$ 29,044

SEGMENT INFORMATION - Reconciliation of Operating Income (Loss) to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	$ 154,310	$ 168,437	$ 234,183	$ 258,387
Stock-based compensation expense	62,425	57,561	129,869	116,643
Depreciation	21,091	18,805	40,062	38,062
Amortization of intangibles	19,638	20,188	42,390	40,141
Interest expense	(37,206)	(27,356)	(68,349)	(53,861)
Other income, net	45,972	171,141	46,623	166,522
Earnings before income taxes	163,076	312,222	212,457	371,048
Income tax benefit (provision)	(16,285)	(31,368)	47,319	(2,355)
Net earnings	146,791	280,854	259,776	368,693
Net earnings attributable to noncontrolling interests	(33,324)	(62,501)	(57,614)	(79,258)
Net earnings attributable to IAC shareholders	113,467	218,353	202,162	289,435
Operating segments \| Match Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	172,898	150,165	291,726	262,398
Stock-based compensation expense	22,015	16,706	50,012	33,669
Depreciation	8,197	8,399	16,028	16,546
Amortization of intangibles	412	237	823	479
Acquisition-related Contingent Consideration Fair Value Adjustments	0	54	0	210
Adjusted EBITDA	203,522	175,561	358,589	313,302
Operating segments \| ANGI Homeservices
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	11,403	23,262	7,762	12,506
Stock-based compensation expense	17,520	22,053	36,802	46,959
Depreciation	8,796	5,886	15,795	12,070
Amortization of intangibles	13,713	15,778	28,252	32,084
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0	0	0
Adjusted EBITDA	51,432	66,979	88,611	103,619
Operating segments \| Vimeo
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	(11,616)	(9,593)	(29,400)	(19,341)
Stock-based compensation expense	0	0	0	0
Depreciation	132	321	325	656
Amortization of intangibles	2,020	1,641	3,411	3,270
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0	0	0
Adjusted EBITDA	(9,464)	(7,631)	(25,664)	(15,415)
Operating segments \| Dotdash
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	7,010	1,339	10,057	4,530
Stock-based compensation expense	0	0	0	0
Depreciation	218	246	444	495
Amortization of intangibles	1,147	409	5,024	818
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0	0	0
Adjusted EBITDA	8,375	1,994	15,525	5,843
Operating segments \| Applications
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	20,967	33,077	46,323	58,538
Stock-based compensation expense	0	0	0	0
Depreciation	389	773	808	1,528
Amortization of intangibles	2,346	1,554	4,730	2,090
Acquisition-related Contingent Consideration Fair Value Adjustments	1,617	0	3,146	0
Adjusted EBITDA	25,319	35,404	55,007	62,156
Operating segments \| Emerging & Other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	(1,789)	6,079	(4,309)	12,572
Stock-based compensation expense	0	1,293	0	1,424
Depreciation	272	349	547	1,102
Amortization of intangibles	0	569	150	1,400
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0	0	0
Adjusted EBITDA	(1,517)	8,290	(3,612)	16,498
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	(44,563)	(35,892)	(87,976)	(72,816)
Stock-based compensation expense	22,890	17,509	43,055	34,591
Depreciation	3,087	2,831	6,115	5,665
Amortization of intangibles	0	0	0	0
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0	0	0
Adjusted EBITDA	$ (18,586)	$ (15,552)	$ (38,806)	$ (32,560)

CONSOLIDATED FINANCIAL STATEMENT DETAILS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Variable Interest Entity [Line Items]
Unrealized gains, net, on equity securities held	$ 29,369	$ 126,414	$ 29,247	$ 126,559
Realized gains, net, for equity securities sold	2,066	27,275	2,144	27,172
Interest income	14,500	7,000	26,900	12,200
Realized gain (loss) on disposition of business			(8,200)
Net foreign currency exchange gains (losses)	(2,100)	10,000		2,100
Pinterest
Variable Interest Entity [Line Items]
Unrealized gains, net, on equity securities held	$ 29,800	128,800	$ 29,800	128,800
Realized gains, net, for equity securities sold		$ 26,800		$ 26,800

CONSOLIDATED FINANCIAL STATEMENT DETAILS - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 3,151,959	$ 2,131,632	$ 1,644,829	$ 1,630,809
Restricted cash included in other current assets	1,574	1,633	347	2,873
Restricted cash included in other non-current assets	420	420	0	0
Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows	$ 3,153,953	$ 2,133,685	$ 1,645,176	$ 1,633,682

CONSOLIDATED FINANCIAL STATEMENT DETAILS - Other (Expense) Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other income (expense), net:
Other income, net	$ 45,972	$ 171,141	$ 46,623	$ 166,522

CONTINGENCIES - Narrative (Details)	Jun. 13, 2019 plaintiff	Aug. 31, 2018 plaintiff	Aug. 14, 2018 USD ($) plaintiff	Jun. 30, 2019 USD ($) 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	6	6	10
Number of plaintiffs that were granted motion to dismiss merger-related claim for breach of contract \| plaintiff	2
Tinder Optionholder Litigation \| Pending Litigation
Loss Contingencies [Line Items]
Damages sought \| $			$ 2,000,000,000

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Narrative (Details)	Jun. 30, 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	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 3,151,959	$ 2,131,632	$ 1,644,829	$ 1,630,809
Marketable securities	161,749	123,665
Accounts receivable, net of allowance and reserves	365,495	279,189
Other current assets	234,884	228,253
Intercompany receivables	0	0
Right-of-use assets	180,290	0
Property and equipment, net of accumulated depreciation and amortization	361,550	318,800
Goodwill	2,892,962	2,726,859
Intangible assets, net of accumulated amortization	628,418	631,422
Investment in subsidiaries	0	0
Other non-current assets	321,798	434,765
TOTAL ASSETS	8,299,105	6,874,585
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	13,750	13,750
Accounts payable, trade	104,392	74,907
Other current liabilities	835,320	794,901
Long-term debt, net	3,138,531	2,245,548
Income taxes payable	36,533	37,584
Intercompany liabilities	0	0
Other long-term liabilities	246,480	90,407
Redeemable noncontrolling interests	80,502	65,687
Shareholders' equity	2,983,461	2,843,125
Noncontrolling interests	860,136	708,676
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	8,299,105	6,874,585
IAC
LIABILITIES AND SHAREHOLDERS' EQUITY
Long-term debt, net	1,297,567	484,666
Reportable Legal Entities \| IAC
ASSETS
Cash and cash equivalents	2,133,905	1,018,082
Marketable securities	0	98,299
Accounts receivable, net of allowance and reserves	0	0
Other current assets	24,852	39,449
Intercompany receivables	0	0
Right-of-use assets	10,861
Property and equipment, net of accumulated depreciation and amortization	6,962	6,526
Goodwill	0	0
Intangible assets, net of accumulated amortization	0	0
Investment in subsidiaries	2,132,545	1,897,699
Other non-current assets	294,891	274,789
TOTAL ASSETS	4,604,016	3,334,844
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	0	0
Accounts payable, trade	2,079	1,304
Other current liabilities	25,552	41,721
Long-term debt, net	34,291	34,262
Income taxes payable	0	15
Intercompany liabilities	1,548,070	414,156
Other long-term liabilities	10,563	261
Redeemable noncontrolling interests	0	0
Shareholders' equity	2,983,461	2,843,125
Noncontrolling interests	0	0
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	4,604,016	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	90,545	99,970
Other current assets	38,163	29,222
Intercompany receivables	1,414,117	1,423,456
Right-of-use assets	40,151
Property and equipment, net of accumulated depreciation and amortization	171,593	163,281
Goodwill	412,009	412,009
Intangible assets, net of accumulated amortization	43,712	43,914
Investment in subsidiaries	427,476	214,519
Other non-current assets	88,523	94,290
TOTAL ASSETS	2,726,289	2,480,661
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	0	0
Accounts payable, trade	43,999	36,293
Other current liabilities	83,694	95,405
Long-term debt, net	0	0
Income taxes payable	1,612	1,707
Intercompany liabilities	0	0
Other long-term liabilities	54,227	18,181
Redeemable noncontrolling interests	0	0
Shareholders' equity	2,542,757	2,329,075
Noncontrolling interests	0	0
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	2,726,289	2,480,661
Reportable Legal Entities \| Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	1,018,054	1,113,550
Marketable securities	161,749	25,366
Accounts receivable, net of allowance and reserves	274,950	179,219
Other current assets	172,650	171,682
Intercompany receivables	133,953	0
Right-of-use assets	155,833
Property and equipment, net of accumulated depreciation and amortization	182,995	148,993
Goodwill	2,480,953	2,314,850
Intangible assets, net of accumulated amortization	584,706	587,508
Investment in subsidiaries	0	0
Other non-current assets	97,554	251,315
TOTAL ASSETS	5,263,397	4,792,483
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	13,750	13,750
Accounts payable, trade	58,314	37,310
Other current liabilities	731,436	669,875
Long-term debt, net	3,104,240	2,211,286
Income taxes payable	34,921	35,862
Intercompany liabilities	0	1,009,300
Other long-term liabilities	362,834	257,594
Redeemable noncontrolling interests	80,502	65,687
Shareholders' equity	17,264	(216,857)
Noncontrolling interests	860,136	708,676
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	5,263,397	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	(781)	(12,100)
Intercompany receivables	(1,548,070)	(1,423,456)
Right-of-use assets	(26,555)
Property and equipment, net of accumulated depreciation and amortization	0	0
Goodwill	0	0
Intangible assets, net of accumulated amortization	0	0
Investment in subsidiaries	(2,560,021)	(2,112,218)
Other non-current assets	(159,170)	(185,629)
TOTAL ASSETS	(4,294,597)	(3,733,403)
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	0	0
Accounts payable, trade	0	0
Other current liabilities	(5,362)	(12,100)
Long-term debt, net	0	0
Income taxes payable	0	0
Intercompany liabilities	(1,548,070)	(1,423,456)
Other long-term liabilities	(181,144)	(185,629)
Redeemable noncontrolling interests	0	0
Shareholders' equity	(2,560,021)	(2,112,218)
Noncontrolling interests	0	0
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ (4,294,597)	$ (3,733,403)

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Revenue	$ 1,186,658	$ 1,059,122	$ 2,292,501	$ 2,054,197
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	276,389	218,224	536,460	420,186
Selling and marketing expense	411,102	369,660	832,962	772,492
General and administrative expense	225,514	188,363	439,130	372,547
Product development expense	78,614	75,445	167,314	152,382
Depreciation	21,091	18,805	40,062	38,062
Amortization of intangibles	19,638	20,188	42,390	40,141
Total operating costs and expenses	1,032,348	890,685	2,058,318	1,795,810
Operating income	154,310	168,437	234,183	258,387
Equity in earnings of unconsolidated affiliates	0	0	0	0
Interest expense	(37,206)	(27,356)	(68,349)	(53,861)
Other (expense) income, net	45,972	171,141	46,623	166,522
Earnings before income taxes	163,076	312,222	212,457	371,048
Income tax benefit (provision)	(16,285)	(31,368)	47,319	(2,355)
Net earnings	146,791	280,854	259,776	368,693
Net earnings attributable to noncontrolling interests	(33,324)	(62,501)	(57,614)	(79,258)
Net earnings attributable to IAC shareholders	113,467	218,353	202,162	289,435
Comprehensive income (loss) attributable to IAC shareholders	114,558	180,909	204,248	280,348
Foreign earnings repatriated		50,000		326,000
Reportable Legal Entities \| IAC
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0	0	0
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	19	75	43	151
Selling and marketing expense	384	189	746	402
General and administrative expense	39,634	31,652	77,893	63,061
Product development expense	469	564	1,116	1,216
Depreciation	432	266	810	532
Amortization of intangibles	0	0	0	0
Total operating costs and expenses	40,938	32,746	80,608	65,362
Operating income	(40,938)	(32,746)	(80,608)	(65,362)
Equity in earnings of unconsolidated affiliates	145,997	252,102	261,437	354,852
Interest expense	(424)	(423)	(848)	(852)
Other (expense) income, net	(7,801)	6,436	(9,698)	(10,411)
Earnings before income taxes	96,834	225,369	170,283	278,227
Income tax benefit (provision)	16,633	(7,016)	31,879	11,208
Net earnings	113,467	218,353	202,162	289,435
Net earnings attributable to noncontrolling interests	0	0	0	0
Net earnings attributable to IAC shareholders	113,467	218,353	202,162	289,435
Comprehensive income (loss) attributable to IAC shareholders	114,558	180,909	204,248	280,348
Reportable Legal Entities \| Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue	200,963	207,964	399,893	420,853
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	90,383	61,215	172,529	117,439
Selling and marketing expense	55,710	80,302	113,676	170,440
General and administrative expense	11,270	14,259	21,804	29,640
Product development expense	13,353	14,151	25,390	28,420
Depreciation	2,914	3,126	5,836	6,466
Amortization of intangibles	1,148	410	5,025	919
Total operating costs and expenses	174,778	173,463	344,260	353,324
Operating income	26,185	34,501	55,633	67,529
Equity in earnings of unconsolidated affiliates	4,542	5,054	5,610	4,727
Interest expense	0	0	0	0
Other (expense) income, net	12,741	62,204	26,592	349,087
Earnings before income taxes	43,468	101,759	87,835	421,343
Income tax benefit (provision)	(4,136)	(12,159)	(9,259)	(23,125)
Net earnings	39,332	89,600	78,576	398,218
Net earnings attributable to noncontrolling interests	0	0	0	0
Net earnings attributable to IAC shareholders	39,332	89,600	78,576	398,218
Comprehensive income (loss) attributable to IAC shareholders	39,117	89,304	78,572	398,265
Reportable Legal Entities \| Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue	985,825	851,240	1,892,803	1,633,500
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	186,065	156,991	364,031	302,703
Selling and marketing expense	355,086	289,205	718,648	601,731
General and administrative expense	174,589	142,441	339,382	279,814
Product development expense	64,787	60,730	140,803	122,746
Depreciation	17,745	15,413	33,416	31,064
Amortization of intangibles	18,490	19,778	37,365	39,222
Total operating costs and expenses	816,762	684,558	1,633,645	1,377,280
Operating income	169,063	166,682	259,158	256,220
Equity in earnings of unconsolidated affiliates	0	0	0	0
Interest expense	(36,782)	(26,933)	(67,501)	(53,009)
Other (expense) income, net	52,755	153,770	53,175	155,960
Earnings before income taxes	185,036	293,519	244,832	359,171
Income tax benefit (provision)	(28,782)	(12,193)	24,699	9,562
Net earnings	156,254	281,326	269,531	368,733
Net earnings attributable to noncontrolling interests	(33,324)	(62,501)	(57,614)	(79,258)
Net earnings attributable to IAC shareholders	122,930	218,825	211,917	289,475
Comprehensive income (loss) attributable to IAC shareholders	124,408	173,337	214,508	278,664
Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenue	(130)	(82)	(195)	(156)
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	(78)	(57)	(143)	(107)
Selling and marketing expense	(78)	(36)	(108)	(81)
General and administrative expense	21	11	51	32
Product development expense	5	0	5	0
Depreciation	0	0	0	0
Amortization of intangibles	0	0	0	0
Total operating costs and expenses	(130)	(82)	(195)	(156)
Operating income	0	0	0	0
Equity in earnings of unconsolidated affiliates	(150,539)	(257,156)	(267,047)	(359,579)
Interest expense	0	0	0	0
Other (expense) income, net	(11,723)	(51,269)	(23,446)	(328,114)
Earnings before income taxes	(162,262)	(308,425)	(290,493)	(687,693)
Income tax benefit (provision)	0	0	0	0
Net earnings	(162,262)	(308,425)	(290,493)	(687,693)
Net earnings attributable to noncontrolling interests	0	0	0	0
Net earnings attributable to IAC shareholders	(162,262)	(308,425)	(290,493)	(687,693)
Comprehensive income (loss) attributable to IAC shareholders	$ (163,525)	$ (262,641)	$ (293,080)	$ (676,929)

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities			$ 355,808	$ 379,802
Cash flows from investing activities:
Acquisitions, net of cash acquired			(201,026)	(17,513)
Capital expenditures			(76,623)	(39,696)
Proceeds from maturities of marketable debt securities	$ 40,000	$ 5,000	163,500	10,000
Purchases of marketable debt securities			(39,740)	(124,397)
Net proceeds from the sale of businesses and investments			23,373	27,540
Purchases of investments			0	(31,180)
Other, net			(2,156)	9,599
Net cash used in investing activities			(132,672)	(165,647)
Cash flows from financing activities:
Purchase of exchangeable note hedges			(303,428)	0
Proceeds from issuance of warrants			166,520	0
Debt issuance costs			(26,361)	(532)
Purchase of noncontrolling interests			(6,121)	(877)
Distribution to IAC pursuant to the ANGI tax sharing agreement			0
Intercompany			0	0
Other, net			(3,719)	(4,829)
Net cash used in financing activities			796,771	(202,705)
Total cash provided			1,019,907	11,450
Effect of exchange rate changes on cash, cash equivalents, and restricted cash			361	44
Net increase in cash, cash equivalents, and restricted cash			1,020,268	11,494
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	3,153,953	1,645,176	3,153,953	1,645,176
Reportable Legal Entities \| IAC
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities			(54,883)	(24,698)
Cash flows from investing activities:
Acquisitions, net of cash acquired			0	(4,142)
Capital expenditures			(1,408)	(2,200)
Proceeds from maturities of marketable debt securities			138,500	10,000
Purchases of marketable debt securities			(39,740)	(124,397)
Net proceeds from the sale of businesses and investments			170	408
Purchases of investments				(18,180)
Other, net			0	(5,000)
Net cash used in investing activities			97,522	(143,511)
Cash flows from financing activities:
Purchase of noncontrolling interests			(3,182)	0
Distribution to IAC pursuant to the ANGI tax sharing agreement			11,355
Intercompany			921,515	375,167
Other, net				2,311
Net cash used in financing activities			1,073,186	396,431
Total cash provided			1,115,825	228,222
Effect of exchange rate changes on cash, cash equivalents, and restricted cash			(2)	11
Net increase in cash, cash equivalents, and restricted cash			1,115,823	228,233
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	2,133,905	813,872	2,133,905	813,872
Reportable Legal Entities \| Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities			92,299	418,153
Cash flows from investing activities:
Acquisitions, net of cash acquired			(7,215)	0
Capital expenditures			(14,104)	(847)
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			(3,270)	3,884
Net cash used in investing activities			(24,550)	3,037
Cash flows from financing activities:
Purchase of noncontrolling interests			0	0
Distribution to IAC pursuant to the ANGI tax sharing agreement			0
Intercompany			(67,749)	(421,190)
Net cash used in financing activities			(67,749)	(421,190)
Net increase in cash, cash equivalents, and restricted cash			0	0
Cash, cash equivalents, and restricted cash at end of period	0	0	0	0
Reportable Legal Entities \| Non-Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities			341,838	314,884
Cash flows from investing activities:
Acquisitions, net of cash acquired			(193,811)	(13,371)
Capital expenditures			(61,111)	(36,649)
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			23,164	27,132
Purchases of investments				(13,000)
Other, net			1,114	10,715
Net cash used in investing activities			(205,644)	(25,173)
Cash flows from financing activities:
Debt issuance costs			(26,361)	(532)
Purchase of noncontrolling interests			(2,939)	(877)
Distribution to IAC pursuant to the ANGI tax sharing agreement			(11,355)
Intercompany			(877,212)	(282,514)
Other, net			(3,719)	(7,140)
Net cash used in financing activities			(232,112)	(506,483)
Total cash provided			(95,918)	(216,772)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash			363	33
Net increase in cash, cash equivalents, and restricted cash			(95,555)	(216,739)
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	1,020,048	831,304	1,020,048	831,304
Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities			(23,446)	(328,537)
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 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
Intercompany			23,446	328,537
Net cash used in financing activities			23,446	328,537
Net increase in cash, cash equivalents, and restricted cash			0	0
Cash, cash equivalents, and restricted cash at end of period	$ 0	$ 0	0	0
IAC/InterActiveCorp
Cash flows from financing activities:
Proceeds from issuance of debt			1,150,000	0
Purchase of Match Group treasury stock				(7,869)
Proceeds from the exercise of stock options			9,767	27,317
Withholding taxes paid on behalf of employees on net settled stock-based awards			(32,789)	(495)
IAC/InterActiveCorp \| Reportable Legal Entities \| IAC
Cash flows from financing activities:
Proceeds from issuance of debt			0
Purchase of Match Group treasury stock				(7,869)
Proceeds from the exercise of stock options			9,767	27,317
Withholding taxes paid on behalf of employees on net settled stock-based awards			(32,789)	(495)
IAC/InterActiveCorp \| Reportable Legal Entities \| Guarantor Subsidiaries
Cash flows from financing activities:
Proceeds from issuance of debt			0
Purchase of Match Group treasury stock
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 issuance of debt			1,150,000
Purchase of Match Group treasury stock
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 issuance of debt			0
Purchase of Match Group treasury stock
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	2,125
Withholding taxes paid on behalf of employees on net settled stock-based awards			(164,710)	(136,727)
Match Group and ANGI Homeservices \| Reportable Legal Entities \| IAC
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 \| 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	2,125
Withholding taxes paid on behalf of employees on net settled stock-based awards			(164,710)	(136,727)
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:
Proceeds from issuance of debt			40,000	0
Purchase of exchangeable note hedges			(303,428)
Proceeds from issuance of warrants			166,520
Proceeds from Match Group 2019 Senior Notes offering			350,000	0
Principal payments on debt			(300,000)	0
Purchase of Match Group treasury stock			(76,086)	(73,943)
Match Group \| Reportable Legal Entities \| IAC
Cash flows from financing activities:
Proceeds from issuance of debt			0
Purchase of exchangeable note hedges			0
Proceeds from issuance of warrants			166,520
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:
Proceeds from issuance of debt			0
Purchase of exchangeable note hedges			0
Proceeds from issuance of warrants			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:
Proceeds from issuance of debt			40,000
Purchase of exchangeable note hedges			(303,428)
Proceeds from issuance of warrants			0
Proceeds from Match Group 2019 Senior Notes offering			350,000
Principal payments on debt			(300,000)
Purchase of Match Group treasury stock			(76,086)	(73,943)
Match Group \| Eliminations
Cash flows from financing activities:
Proceeds from issuance of debt			0
Purchase of exchangeable note hedges			0
Proceeds from issuance of warrants			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			(6,875)	(6,875)
ANGI Homeservices \| Reportable Legal Entities \| IAC
Cash flows from financing activities:
Principal payments on debt			0	0
ANGI Homeservices \| Reportable Legal Entities \| Guarantor Subsidiaries
Cash flows from financing activities:
Principal payments on debt			0	0
ANGI Homeservices \| Reportable Legal Entities \| Non-Guarantor Subsidiaries
Cash flows from financing activities:
Principal payments on debt			(6,875)	(6,875)
ANGI Homeservices \| Eliminations
Cash flows from financing activities:
Principal payments on debt			$ 0	$ 0

SUBSEQUENT EVENTS - Narrative (Details) - USD ($) $ in Thousands	Jul. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Equity method investment		$ 0	$ 0
Turo \| Subsequent Event
Subsequent Event [Line Items]
Equity method investment	$ 250,000
4.75% Senior Notes \| IAC \| Senior Notes
Subsequent Event [Line Items]
Stated interest rate (as a percent)		4.75%

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
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	36,795,000
Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 36,795,000