Match (MTCH) 10-Q 7 Nov 19 2019 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2019	Nov. 01, 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	Q3
Amendment Flag	false
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 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 Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		78,800,508
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		5,789,499

CONSOLIDATED BALANCE SHEET

CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 2,946,180	$ 2,131,632
Marketable securities	157,174	123,665
Accounts receivable, net of allowance and reserves of $25,003 and $18,860, respectively	355,924	279,189
Other current assets	225,016	228,253
Total current assets	3,684,294	2,762,739
Right-of-use assets	177,797	0
Property and equipment, net of accumulated depreciation and amortization of $308,987 and $286,798, respectively	361,664	318,800
Goodwill	2,852,986	2,726,859
Intangible assets, net of accumulated amortization of $196,563 and $136,405, respectively	603,702	631,422
Long-term investments	333,980	235,055
Deferred income taxes	170,299	64,786
Other non-current assets	120,069	134,924
TOTAL ASSETS	8,304,791	6,874,585
LIABILITIES:
Current portion of long-term debt	13,750	13,750
Accounts payable, trade	100,858	74,907
Deferred revenue	414,325	360,015
Accrued expenses and other current liabilities	507,348	434,886
Total current liabilities	1,036,281	883,558
Long-term debt, net	3,111,882	2,245,548
Income taxes payable	36,297	37,584
Deferred income taxes	21,657	23,600
Other long-term liabilities	215,611	66,807
Redeemable noncontrolling interests	77,302	65,687
Commitments and contingencies
Additional paid-in capital	11,761,711	12,022,387
Retained earnings	1,589,500	1,258,794
Accumulated other comprehensive loss	(144,604)	(128,722)
Treasury stock 194,708 shares	(10,309,612)	(10,309,612)
Total IAC shareholders' equity	2,897,274	2,843,125
Noncontrolling interests	908,487	708,676
Total shareholders' equity	3,805,761	3,551,801
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	8,304,791	6,874,585
Common stock $.001 par value; authorized 1,600,000 shares; issued 263,110 and 262,303 shares, respectively, and outstanding 78,770 and 77,963 shares, respectively
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
Common stock	$ 16	$ 16

CONSOLIDATED BALANCE SHEET (Par

CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Allowance for accounts receivable	$ 25,003	$ 18,860
Accumulated depreciation and amortization of property and equipment	308,987	286,798
Accumulated amortization of intangible assets	$ 196,563	$ 136,405
Treasury stock (shares)	194,708,000	194,708,000
Common stock $.001 par value; authorized 1,600,000 shares; issued 263,110 and 262,303 shares, respectively, and outstanding 78,770 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)	263,110,000	262,303,000
Common stock outstanding (shares)	78,770,000	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 OPERA

CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue	$ 1,246,874	$ 1,104,592	$ 3,539,375	$ 3,158,789
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	296,385	237,238	832,845	657,424
Selling and marketing expense	423,881	386,802	1,256,843	1,159,294
General and administrative expense	207,880	190,903	647,010	563,450
Product development expense	86,600	77,740	253,914	230,122
Depreciation	23,090	18,925	63,152	56,987
Amortization of intangibles	23,186	20,152	65,576	60,293
Total operating costs and expenses	1,061,022	931,760	3,119,340	2,727,570
Operating Income (Loss)	185,852	172,832	420,035	431,219
Interest expense	(42,132)	(27,610)	(110,481)	(81,471)
Other income, net	1,229	8,113	47,852	174,635
Earnings before income taxes	144,949	153,335	357,406	524,383
Income tax benefit	14,823	18,242	62,142	15,887
Net earnings	159,772	171,577	419,548	540,270
Net earnings attributable to noncontrolling interests	(31,228)	(25,803)	(88,842)	(105,061)
Net earnings attributable to IAC shareholders	$ 128,544	$ 145,774	$ 330,706	$ 435,209
Earnings per share attributable to IAC shareholders:
Basic earnings per share (USD per share)	$ 1.52	$ 1.75	$ 3.93	$ 5.22
Diluted earnings per share (USD per share)	$ 1.35	$ 1.49	$ 3.45	$ 4.55
Stock-based compensation expense by function:
Stock-based compensation expense	$ 50,053	$ 55,363	$ 179,922	$ 172,006
Cost of revenue
Stock-based compensation expense by function:
Stock-based compensation expense	935	512	2,919	1,937
Selling and marketing expense
Stock-based compensation expense by function:
Stock-based compensation expense	2,338	1,837	7,815	5,679
General and administrative expense
Stock-based compensation expense by function:
Stock-based compensation expense	36,883	44,242	131,842	134,743
Product development expense
Stock-based compensation expense by function:
Stock-based compensation expense	$ 9,897	$ 8,772	$ 37,346	$ 29,647

CONSOLIDATED STATEMENT OF COMPR

CONSOLIDATED STATEMENT OF COMPREHENSIVE OPERATIONS - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net earnings		$ 159,772	$ 171,577	$ 419,548	$ 540,270
Other comprehensive loss, net of income taxes:
Change in foreign currency translation adjustment		(23,053)	(1,050)	(20,647)	(12,233)
Change in unrealized gains and losses of available-for-sale securities	[1]	0	(28)	(5)	(15)
Total other comprehensive loss, net of income taxes		(23,053)	(1,078)	(20,652)	(12,248)
Comprehensive income, net of income taxes		136,719	170,499	398,896	528,022
Components of comprehensive income attributable to noncontrolling interests:
Net earnings attributable to noncontrolling interests		(31,228)	(25,803)	(88,842)	(105,061)
Change in foreign currency translation adjustment attributable to noncontrolling interests		4,664	549	4,348	2,632
Change in unrealized gains and losses of available-for-sale debt securities attributable to noncontrolling interests		0	0	1	0
Comprehensive income attributable to noncontrolling interests		(26,564)	(25,254)	(84,493)	(102,429)
Comprehensive income attributable to IAC shareholders		$ 110,155	$ 145,245	$ 314,403	$ 425,593
[1]	Net of income tax benefit of $4 for the three months ended September 30, 2018 .

CONSOLIDATED STATEMENT OF COM_2

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

CONSOLIDATED STATEMENT OF SHARE

CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Redeemable Noncontrolling Interests	Total IAC Shareholders' Equity	Common StockCommon Stock $.001 Par Value	Common StockClass B Convertible Common Stock $.001 Par Value	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interests	Match Group and ANGI Homeservices	Match Group and ANGI HomeservicesTotal IAC Shareholders' Equity	Match Group and ANGI HomeservicesAdditional Paid-in Capital	Match Group and ANGI HomeservicesAccumulated Other Comprehensive Loss	Match Group and ANGI HomeservicesNoncontrolling Interests	Match Group	Match GroupTotal IAC Shareholders' Equity	Match GroupAdditional Paid-in Capital
Balance at beginning of period at Dec. 31, 2017		$ 42,867
Increase (Decrease) in Redeemable Noncontrolling Interests
Net (loss) earnings		34,481
Other comprehensive loss, net of income taxes		(710)
Stock-based compensation expense		1,084
Adjustment of redeemable noncontrolling interests to fair value		(372)
Noncontrolling interests created in acquisitions	$ 14,246	2,261								$ 14,246
Other		(6,519)
Balance at end of period at Sep. 30, 2018		69,530
Balance at beginning of period at Dec. 31, 2017	2,946,823		$ 2,430,028	$ 261	$ 16	$ 12,165,002	$ 595,038	$ (103,568)	$ (10,226,721)	516,795
Balance at beginning of period (shares) at Dec. 31, 2017				260,624,000	16,157,000
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings	505,789		435,209				435,209			70,580
Other comprehensive loss, net of income taxes	(11,538)		(9,616)					(9,616)		(1,922)
Stock-based compensation expense	170,922		52,763			52,763				118,159
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	34,903		34,903	$ 1		34,902
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares)				1,416,000
Purchase of treasury stock	(82,891)		(82,891)						(82,891)							$ (86,239)	$ (86,239)	$ (86,239)
Purchase of redeemable noncontrolling interests	(1,236)	(3,562)								(1,236)
Adjustment of redeemable noncontrolling interests to fair value	372		372			372
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests											$ (205,416)	$ (213,111)	$ (213,440)	$ 329	$ 7,695
Noncontrolling interests created in acquisitions	14,246	2,261								14,246
Other	2,652		2,269			2,269				383
Balance at end of period at Sep. 30, 2018	3,328,592		2,600,482	$ 262	$ 16	11,955,629	1,067,042	(112,855)	(10,309,612)	728,110
Balance at end of period (shares) at Sep. 30, 2018				262,040,000	16,157,000
Balance at beginning of period at Jun. 30, 2018		75,719
Increase (Decrease) in Redeemable Noncontrolling Interests
Net (loss) earnings		(275)
Other comprehensive loss, net of income taxes		(424)
Stock-based compensation expense		284
Purchase of redeemable noncontrolling interests		59
Adjustment of redeemable noncontrolling interests to fair value		(2,221)
Other		(50)
Balance at end of period at Sep. 30, 2018		69,530
Balance at beginning 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 beginning of period (shares) at Jun. 30, 2018				261,757,000	16,157,000
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings	171,852		145,774				145,774			26,078
Other comprehensive loss, net of income taxes	(654)		(529)					(529)		(125)
Stock-based compensation expense	55,079		16,748			16,748				38,331
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	9,012		9,012			9,012
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares)				283,000
Purchase of treasury stock	(68,178)		(68,178)						(68,178)							$ (6,433)	$ (6,433)	$ (6,433)
Purchase of redeemable noncontrolling interests	(418)	(3,562)								(418)
Adjustment of redeemable noncontrolling interests to fair value	2,221		2,221			2,221
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests											(70,838)	(74,089)	(74,480)	391	3,251
Other	1		(123)			(123)				124
Balance at end of period at Sep. 30, 2018	3,328,592		2,600,482	$ 262	$ 16	11,955,629	1,067,042	(112,855)	(10,309,612)	728,110
Balance at end of period (shares) at Sep. 30, 2018				262,040,000	16,157,000
Balance at beginning of period at Dec. 31, 2018	65,687	65,687
Increase (Decrease) in Redeemable Noncontrolling Interests
Net (loss) earnings		4,625
Other comprehensive loss, net of income taxes		(514)
Stock-based compensation expense		113
Purchase of redeemable noncontrolling interests		(6,192)
Adjustment of redeemable noncontrolling interests to fair value		8,607
Noncontrolling interests created in acquisitions		5,009
Other		(33)
Balance at end of period at Sep. 30, 2019	77,302	77,302
Balance at beginning of period at Dec. 31, 2018	3,551,801		2,843,125	$ 262	$ 16	12,022,387	1,258,794	(128,722)	(10,309,612)	708,676
Balance at beginning of period (shares) at Dec. 31, 2018				262,303,000	16,157,000
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings	414,923		330,706				330,706			84,217
Other comprehensive loss, net of income taxes	(20,138)		(16,303)					(16,303)		(3,835)
Stock-based compensation expense	179,639		63,387			63,387				116,252
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	(78,058)		(78,058)	$ 1		(78,059)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares)				807,000
Purchase of treasury stock											(220,636)	(220,636)	(220,636)
Adjustment of redeemable noncontrolling interests to fair value	(8,607)		(8,607)			(8,607)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests											(197,236)	(200,240)	(200,661)	421	3,004
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	320,998		320,998			320,998
Issuance of warrants	166,520		166,520			166,520
Other	(17)		(190)			(190)				173
Balance at end of period at Sep. 30, 2019	3,805,761		2,897,274	$ 263	$ 16	11,761,711	1,589,500	(144,604)	(10,309,612)	908,487
Balance at end of period (shares) at Sep. 30, 2019				263,110,000	16,157,000
Balance at beginning of period at Jun. 30, 2019		80,502
Increase (Decrease) in Redeemable Noncontrolling Interests
Net (loss) earnings		(1,270)
Other comprehensive loss, net of income taxes		(365)
Stock-based compensation expense		36
Purchase of redeemable noncontrolling interests		(71)
Adjustment of redeemable noncontrolling interests to fair value		(1,531)
Other		1
Balance at end of period at Sep. 30, 2019	77,302	$ 77,302
Balance at beginning 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 beginning of period (shares) at Jun. 30, 2019				262,789,000	16,157,000
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings	161,042		128,544				128,544			32,498
Other comprehensive loss, net of income taxes	(22,688)		(18,389)					(18,389)		(4,299)
Stock-based compensation expense	49,853		20,332			20,332				29,521
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	(55,036)		(55,036)			(55,036)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares)				321,000
Purchase of treasury stock											(139,779)	(139,779)	(139,779)
Adjustment of redeemable noncontrolling interests to fair value	1,531		1,531			1,531
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests											$ (32,628)	$ (23,259)	$ (22,749)	$ (510)	$ (9,369)
Equity component of exchangeable senior notes, net of deferred financing costs and deferred tax liabilities	(130)		(130)			(130)
Other	(1)		(1)			(1)
Balance at end of period at Sep. 30, 2019	$ 3,805,761		$ 2,897,274	$ 263	$ 16	$ 11,761,711	$ 1,589,500	$ (144,604)	$ (10,309,612)	$ 908,487
Balance at end of period (shares) at Sep. 30, 2019				263,110,000	16,157,000

CONSOLIDATED STATEMENT OF SHA_2

CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Parenthetical)	Sep. 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

CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net earnings	$ 419,548	$ 540,270
Adjustments to reconcile net earnings to net cash provided by operating activities:
Stock-based compensation expense	179,922	172,006
Amortization of intangibles	65,576	60,293
Depreciation	63,152	56,987
Bad debt expense	50,507	35,521
Deferred income taxes	(85,040)	(36,866)
Unrealized gains on equity securities, net	(24,181)	(126,444)
Losses (gains) from the sale of investments and businesses, net	6,028	(27,240)
Other adjustments, net	29,381	12,677
Changes in assets and liabilities, net of effects of acquisitions and dispositions:
Accounts receivable	(133,492)	(78,665)
Other assets	11,324	(48,935)
Accounts payable and other liabilities	53,957	57,891
Income taxes payable and receivable	(2,951)	1,971
Deferred revenue	55,035	52,234
Net cash provided by operating activities	688,766	671,700
Cash flows from investing activities:
Acquisitions, net of cash acquired	(200,338)	(17,635)
Capital expenditures	(103,645)	(60,113)
Proceeds from maturities of marketable debt securities	163,500	125,000
Purchases of marketable debt securities	(39,740)	(326,906)
Net proceeds from the sale of businesses and investments	24,757	28,630
Purchases of investments	(250,095)	(32,180)
Other, net	(1,733)	9,646
Net cash used in investing activities	(407,294)	(273,558)
Cash flows from financing activities:
Repurchases of IAC debt	(35,035)	(363)
Purchase of exchangeable note hedges	(303,428)	0
Proceeds from issuance of warrants	166,520	0
Debt issuance costs	(27,815)	(532)
Purchase of noncontrolling interests	(6,192)	(4,798)
Other, net	(3,799)	(4,526)
Net cash provided by (used in) financing activities	535,530	(359,856)
Total cash provided	817,002	38,286
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(2,534)	(207)
Net increase in cash, cash equivalents, and restricted cash	814,468	38,079
Cash, cash equivalents, and restricted cash at beginning of period	2,133,685	1,633,682
Cash, cash equivalents, and restricted cash at end of period	2,948,153	1,671,761
IAC/InterActiveCorp
Cash flows from financing activities:
Proceeds from issuance of debt	1,150,000	0
Purchase of treasury stock		(82,891)
Proceeds from the exercise of stock options	10,225	38,903
Withholding taxes paid on behalf of employees on net settled stock-based awards	(88,269)	(3,011)
Match Group and ANGI Homeservices
Cash flows from financing activities:
Purchase of treasury stock	(209,715)	(86,239)
Withholding taxes paid on behalf of employees on net settled stock-based awards	(197,222)	(208,962)
Match Group
Cash flows from financing activities:
Proceeds from issuance of debt	40,000	0
Proceeds from Match Group 2019 Senior Notes offering	350,000	0
Principal payments on debt	(300,000)	0
ANGI Homeservices
Cash flows from financing activities:
Principal payments on debt	(10,313)	(10,313)
Proceeds from the exercise of stock options	$ 573	$ 2,876

THE COMPANY AND SUMMARY OF SIGN

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	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 operates Vimeo and Dotdash, among many other online businesses. On October 10, 2019, IAC made a preliminary proposal to a special committee of disinterested directors formed by the Match Group Board of Directors for a transaction that would result in the full separation of Match Group from IAC. The proposed separation transaction (the "Separation"), if completed, would result in two independent public companies, referred to herein as "New Match" and "New IAC." IAC would no longer have an ownership stake in Match Group following the Separation and IAC stockholders would receive shares of both New Match and New IAC in the transaction. 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 September 30, 2019 , IAC’s economic and voting interest in: • Match Group were 80.8% , and 97.5% , respectively. All references to "Match Group" or "MTCH" in this report are to Match Group, Inc. • ANGI Homeservices were 83.7% , and 98.1% , 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 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 September 30, 2019 and December 31, 2018 , the Company did not have any investments accounted for using the equity method. 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. 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 the 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 nine months ended September 30, 2019, the Company recognized $346.5 million of revenue that was included in the deferred revenue balance as of December 31, 2018. During the nine months ended September 30, 2018, the Company recognized $317.2 million of revenue that was included in the deferred revenue balance as of January 1, 2018. The current and non-current deferred revenue balances at September 30, 2019 are $414.3 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 $43.2 million and $40.5 million at September 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 nine months ended September 30, 2019 , consolidated revenue earned from Google was $182.5 million and $574.7 million , respectively, representing 15% and 16% , respectively, of the Company's consolidated revenue. For the three and nine months ended September 30, 2018 , consolidated revenue earned from Google was $204.4 million and $620.7 million , representing 19% and 20% , respectively, of the Company's consolidated revenue. Accounts receivable related to revenue earned from Google totaled $61.9 million and $69.1 million at September 30, 2019 and December 31, 2018 , respectively. Revenue attributable to the Services Agreement is earned by the Desktop business within the Applications segment and Ask Media Group within the Emerging & Other segment. For the three and nine months ended September 30, 2019 , revenue from the Services Agreement of $68.1 million and $234.1 million , respectively, was earned within the Applications segment and $100.3 million and $298.4 million , respectively, within the Emerging & Other segment. For the three and nine months ended September 30, 2018 , revenue from the Services Agreement of $110.8 million and $326.7 million , respectively, was earned within the Applications segment and $79.9 million and $248.2 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 ; provided that during September 2020 and during each September thereafter, either party may, after discussion with the other party, terminate the services agreement, effective on September 30 of the year following the year such notice is given. The Company believes that the amended agreement, taken as a whole, is comparable to the Company’s 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 industry-wide policy changes, which became effective on July 1, 2019, related to all extensions distributed through the Chrome Web Store. This industry-wide change, combined with recent changes to polices under the Services Agreement, have had a negative impact on the expected future results of operations of the Desktop business. As of September 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. The fair values of the Desktop reporting unit and the related intangible asset approximate their carrying values, therefore, a modest reduction in the fair values of the Desktop reporting unit or the related intangible asset would result in an impairment charge, which would be equal to the excess of the carrying value over the fair value of such assets. 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 results of operations or 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	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
LEASES	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 September 30, 2019 (In thousands) Assets: Right-of-use assets Right-of-use assets $ 177,797 Liabilities: Current lease liabilities Accrued expenses and other current liabilities 33,029 Long-term lease liabilities Other long-term liabilities 198,962 Total lease liabilities $ 231,991 Lease Cost Income Statement Classification Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 (In thousands) Fixed lease cost Cost of revenue $ 975 $ 3,181 Fixed lease cost Selling and marketing expense 2,836 7,747 Fixed lease cost General and administrative expense 7,424 24,014 Fixed lease cost Product development expense 450 1,050 Total fixed lease cost (a) 11,685 35,992 Variable lease cost Cost of revenue 90 354 Variable lease cost Selling and marketing expense 337 1,007 Variable lease cost General and administrative expense 1,799 5,487 Variable lease cost Product development expense 74 173 Total variable lease cost 2,300 7,021 Net lease cost $ 13,985 $ 43,013 _____________________ (a) Includes approximately $1.1 million and $4.2 million of short-term lease cost and $0.6 million and $1.6 million of sublease income for the three and nine months ended September 30, 2019 , respectively. Maturities of lease liabilities as of September 30, 2019 (in thousands) (b) : Remainder of 2019 $ 9,565 2020 46,199 2021 40,761 2022 33,659 2023 28,836 After 2023 249,912 Total 408,932 Less: Interest 176,941 Present value of lease liabilities $ 231,991 _____________________ (b) Lease payments exclude $6.0 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 September 30, 2019 : Remaining lease term 15.2 years Discount rate 6.02 % Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 (In thousands) Other Information: Right-of-use assets obtained in exchange for lease liabilities $ 6,699 $ 59,857 Cash paid for amounts included in the measurement of lease liabilities $ 10,719 $ 34,433

INCOME TAXES

INCOME TAXES	9 Months Ended
	Sep. 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. Included in the income tax benefit for the three months ended September 30, 2019 is a benefit of $3.6 million due to a lower estimated annual effective income tax rate from that applied to ordinary income through the six months ended June 30, 2019. The lower estimated annual effective income tax rate was primarily due to an increase in estimated research credits. For the three and nine months ended September 30, 2019 , the Company recorded an income tax benefit, despite pre-tax income, of $14.8 million and $62.1 million , respectively, due primarily to excess tax benefits generated by the exercise and vesting of stock-based awards and research credits. For the three and nine months ended September 30, 2018 , the Company recorded an income tax benefit, despite pre-tax income, of $18.2 million and $15.9 million , respectively, due primarily to excess tax benefits generated by the exercise and vesting of stock-based awards, a reduction in the Transition Tax described below, and research credits. The Tax Cuts and Jobs Act subjected to U.S. taxation certain previously deferred earnings of foreign subsidiaries as of December 31, 2017 (“Transition Tax”). The Company was able to make a reasonable estimate of the Transition Tax and recorded a provisional tax expense in the fourth quarter of 2017. In the third quarter of 2018, the Company finalized this calculation, which resulted in a $9.2 million reduction in the Transition Tax. The net reduction in the Transition Tax was due primarily to the utilization of additional foreign tax credits and a reduction in state taxes, partially offset by additional taxable earnings and profits of our foreign subsidiaries based on Internal Revenue Service ("IRS") guidance. The Company recognizes interest and, if applicable, penalties related to unrecognized tax benefits in the income tax provision. Accruals for interest and penalties are not material. The Company is routinely under audit by federal, state, local and foreign authorities in the area of income tax. These audits include questioning the timing and the amount of income and deductions and the allocation of income and deductions among various tax jurisdictions. The IRS is currently auditing the Company’s federal income tax returns for the years ended December 31, 2010 through 2016. The statute of limitations for the years 2010 through 2012 has been extended to 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 September 30, 2019 and December 31, 2018 , unrecognized tax benefits, including interest and penalties, are $68.3 million and $52.3 million , respectively. Unrecognized tax benefits, including interest, at September 30, 2019 increased by $16.0 million due primarily to research credits. If unrecognized tax benefits at September 30, 2019 are subsequently recognized, $63.5 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 $24.5 million by September 30, 2020, due to expirations of statutes of limitations or other settlements; of this amount, $24.3 million would reduce the income tax provision.

FINANCIAL INSTRUMENTS

FINANCIAL INSTRUMENTS	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
FINANCIAL INSTRUMENTS	FINANCIAL INSTRUMENTS Marketable Securities At September 30, 2019 and December 31, 2018 , the fair value of marketable securities are as follows: September 30, 2019 December 31, 2018 (In thousands) Marketable equity securities $ 157,174 $ 419 Available-for-sale marketable debt securities — 123,246 Total marketable securities $ 157,174 $ 123,665 The Company has an investment in Pinterest, which is carried at fair value following its initial public offering in April 2019. Prior to this, the Company accounted for its investment in Pinterest as an equity security without a readily determinable fair value. Unrealized gains or losses related to the Company's investment in Pinterest is included in "Other income, net" in the accompanying consolidated statement of operations. For the three and nine months ended September 30, 2019 , the Company recognized an unrealized loss of $4.6 million and an unrealized gain of $25.3 million , respectively. At December 31, 2018 , current available-for-sale marketable debt securities were as follows: Amortized Gross Gross 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 September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Proceeds from maturities of available-for-sale marketable debt securities $ — $ 115,000 $ 163,500 $ 125,000 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 sales of available-for-sale marketable debt securities for the three and nine months ended September 30, 2019 and 2018 . Equity securities without readily determinable fair values At September 30, 2019 and December 31, 2018 , the carrying values of the Company's investments in equity securities without readily determinable fair values totaled $334.0 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. In the third quarter of 2019, the Company made a $250 million investment in Turo, a peer-to-peer car sharing marketplace. As part of its investment, the Company received a warrant that is net settleable at the Company's option and is recorded at fair value each reporting period with any change included in "Other income, net" in the accompany consolidated statement of operations. The warrant is measured using significant unobservable inputs and is classified in the fair value hierarchy table below as Level 3. The warrant is included in "Other non-current assets" in the accompanying consolidated balance sheet. The following table presents a summary of realized and unrealized gains and losses recorded in other income (expense), net, as adjustments to the carrying value of equity securities without readily determinable fair values held as of September 30, 2019 and 2018 . Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Upward adjustments (gross unrealized gains) $ 53 $ — $ 53 $ 128,786 Downward adjustments including impairment (gross unrealized losses) (543 ) — (1,193 ) (2,588 ) Total $ (490 ) $ — $ (1,140 ) $ 126,198 The cumulative upward and downward adjustments (including impairments) to the carrying value of equity securities without readily determinable fair values held at September 30, 2019 were $0.3 million and $3.0 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 nine months ended September 30, 2019 and 2018 are as follows: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Realized (losses) gains, net, for equity securities sold $ (8 ) $ 702 $ 2,136 $ 27,874 Unrealized (losses) gains, net, on equity securities held (5,066 ) (115 ) 24,181 126,444 Total (losses) gains recognized, net, in other income, net $ (5,074 ) $ 587 $ 26,317 $ 154,318 Fair Value Measurements The Company categorizes its financial instruments measured at fair value into a fair value hierarchy that prioritizes the inputs used in pricing the asset or liability. The three levels of the fair value hierarchy are: • Level 1: Observable inputs obtained from independent sources, such as quoted market prices for identical assets and liabilities in active markets. • Level 2: Other inputs, which are observable directly or indirectly, such as quoted market prices for similar assets or liabilities in active markets, quoted market prices for identical or similar assets or liabilities in markets that are not active and inputs that are derived principally from or corroborated by observable market data. The fair values of the Company's Level 2 financial assets are primarily obtained from observable market prices for identical underlying securities that may not be actively traded. Certain of these securities may have different market prices from multiple market data sources, in which case an average market price is used. • Level 3: Unobservable inputs for which there is little or no market data and require the Company to develop its own assumptions, based on the best information available in the circumstances, about the assumptions market participants would use in pricing the assets or liabilities. The following tables present the Company's financial instruments that are measured at fair value on a recurring basis: September 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 $ 818,158 $ — $ — $ 818,158 Treasury discount notes — 1,349,257 — 1,349,257 Time deposits — 145,035 — 145,035 Marketable securities: Marketable equity security 157,174 — — 157,174 Other non-current assets: Warrant — — 8,929 8,929 Total $ 975,332 $ 1,494,292 $ 8,929 $ 2,478,553 Liabilities: Contingent consideration arrangement $ — $ — $ (13,664 ) $ (13,664 ) 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 following tables present the changes in the Company's financial instruments that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3): Three Months Ended September 30, 2019 2018 Warrant Contingent Contingent (In thousands) Balance at July 1 $ — $ (29,803 ) $ (1,910 ) Total net (losses) gains: Included in earnings: Fair value adjustments (8,689 ) 16,139 (55 ) Included in other comprehensive loss — — (15 ) Fair value date of acquisition 17,618 — — Balance at September 30 $ 8,929 $ (13,664 ) $ (1,980 ) Nine Months Ended September 30, 2019 2018 Warrant Contingent Contingent (In thousands) Balance at January 1 $ — $ (28,631 ) $ (2,647 ) Total net (losses) gains: Included in earnings: Fair value adjustments (8,689 ) 12,993 (265 ) Included in other comprehensive loss — (14 ) (16 ) Fair value at date of acquisition 17,618 — — Settlements — 1,988 948 Balance at September 30 $ 8,929 $ (13,664 ) $ (1,980 ) Contingent Consideration Arrangements At September 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 September 30, 2019 , the gross fair value of this arrangement, before unamortized discount, is $22.3 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 and 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, if the arrangements are initially long-term in nature, applying a discount rate that appropriately captures the risks associated with the obligations to determine the net amount reflected in the consolidated financial statements. The fair value of the contingent consideration arrangement at September 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 September 30, 2019 and December 31, 2018 includes a current portion of $2.0 million and $2.0 million , respectively, and a non-current portion of $11.7 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: September 30, 2019 December 31, 2018 Carrying Fair Carrying Fair (In thousands) Current portion of long-term debt $ (13,750 ) $ (13,681 ) $ (13,750 ) $ (12,753 ) Long-term debt, net (a) (3,111,882 ) (3,934,574 ) (2,245,548 ) (2,460,204 ) _____________________ (a) At September 30, 2019 and December 31, 2018 , the carrying value of long-term debt, net includes unamortized original issue discount and debt issuance costs of $417.8 million and $88.9 million , respectively . At September 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

LONG-TERM DEBT

LONG-TERM DEBT	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT At September 30, 2019 and December 31, 2018 , long-term debt consists of: September 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 15 350,000 — Total MTCH long-term debt 1,625,000 1,535,000 Less: unamortized original issue discount 6,586 7,352 Less: unamortized debt issuance costs 15,786 11,737 Total MTCH debt, net 1,602,628 1,515,911 ANGI Debt: ANGI Term Loan due November 5, 2023 250,938 261,250 Less: current portion of ANGI Term Loan 13,750 13,750 Less: unamortized debt issuance costs 1,942 2,529 Total ANGI debt, net 235,246 244,971 IAC Debt: 0.875% Exchangeable Senior Notes due October 1, 2022 (the "2022 Exchangeable Notes"); interest payable each April 1 and October 1 517,500 517,500 0.875% Exchangeable Senior Notes due June 15, 2026 (the "2026 Exchangeable Notes"); 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 "2030 Exchangeable Notes"); interest payable each January 15 and July 15; commencing on January 15, 2020 575,000 — 4.75% Senior Notes due December 15, 2022 (the "4.75% Senior Notes"); interest payable each June 15 and December 15 — 34,489 Total IAC long-term debt 1,667,500 551,989 Less: unamortized original issue discount 362,390 54,025 Less: unamortized debt issuance costs 31,102 13,298 Total IAC debt, net 1,274,008 484,666 Total long-term debt, net $ 3,111,882 $ 2,245,548 MTCH Senior Notes The 6.375% MTCH Senior Notes were issued on June 1, 2016 and are currently redeemable. 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 September 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 therein, 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 September 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 4.66% and 5.09% at September 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 September 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 25 basis points at both September 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 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 September 30, 2019 and December 31, 2018 , the outstanding balance on the ANGI Term Loan was $250.9 million and $261.3 million , respectively. At both September 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 3.53% and approximately 4.00% at September 30, 2019 and December 31, 2018 , respectively. 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 ANGI Term Loan requires 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 September 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 September 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 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 2022 Exchangeable Notes. During the second quarter of 2019, IAC FinanceCo 2, Inc. and IAC FinanceCo 3, Inc., direct, wholly-owned subsidiaries of the Company, issued $575.0 million aggregate principal amount of its 2026 Exchangeable Notes and $575.0 million aggregate principal amount of its 2030 Exchangeable Notes, respectively. The net proceeds from the sales of the 2026 Exchangeable Notes and the 2030 Exchangeable Notes were approximately $1.1 billion , after deducting fees and expenses. A portion of the net proceeds from the offerings were used to pay the net premium of $136.9 million on the 2026 Exchangeable Notes Hedge and Warrants and the 2030 Exchangeable Notes Hedge and Warrants (described below). The remainder will be used for general corporate purposes. The 2022, 2026 and 2030 Exchangeable Notes (collectively the "Exchangeable Notes") are guaranteed by the Company. At September 30, 2019 , the Company, excluding MTCH and ANGI, held $2.3 billion in cash and cash equivalents and marketable securities, which is in excess of $1.7 billion of the Exchangeable Notes outstanding. The following table presents detail of the exchangeable feature: Number of shares of the Company's Common Stock into which each $1,000 of Principal of the Exchangeable Notes is Exchangeable* Approximate Equivalent Exchange Price per Share* Exchangeable Date 2022 Exchangeable Notes 6.5713 $ 152.18 July 1, 2022 2026 Exchangeable Notes 3.3028 $ 302.77 March 15, 2026 2030 Exchangeable Notes 3.4323 $ 291.35 October 15, 2029 _____________________ * Subject to adjustment upon the occurrence of specified events. The Exchangeable Notes are exchangeable 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 respective Exchangeable Notes. On or after the respective exchangeable dates noted in the table above, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may exchange all or any portion of their Exchangeable Notes regardless of the foregoing conditions. Upon exchange, the Company, in its sole discretion, has the option to settle the Exchangeable Notes 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 Exchangeable Notes 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 Exchangeable Note Hedges (described below). The Company’s 2022 Exchangeable Notes are currently exchangeable; during the three and nine months ended September 30, 2019, no notes were exchanged. The if-converted value of the 2022 Exchangeable Notes exceeded its principal amount of $517.5 million by $223.7 million and $105.0 million based on the Company's stock price on September 30, 2019 and December 31, 2018 , respectively. 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. We separately account for the debt and equity components of the Exchangeable Notes, and therefore, the Company recorded an original issue discount and corresponding increase to additional paid-in capital, 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 and the debt issuance costs utilizing the effective interest method over the life of the Exchangeable Notes. The effective interest rates for the 2022, 2026 and 2030 Exchangeable Notes are 4.73% , 5.35% and 6.59% , respectively. The following table sets forth the components of the Exchangeable Notes as of September 30, 2019 and December 31, 2018 (in thousands): 2022 Exchangeable Notes 2026 Exchangeable Notes 2030 Exchangeable Notes September 30, 2019 Liability component: Principal $ 517,500 $ 575,000 $ 575,000 Less: unamortized original issue discount 44,259 133,188 184,943 Net carrying value of the liability component $ 473,241 $ 441,812 $ 390,057 Equity component $ 70,363 $ 138,796 $ 189,213 2022 Exchangeable Notes December 31, 2018 Liability component: Principal $ 517,500 Less: unamortized original issue discount 54,025 Net carrying value of the liability component $ 463,475 Equity component $ 70,363 The following table sets forth interest expense recognized related to the Exchangeable Notes (in thousands): Three Months Ended September 30, 2019 2022 Exchangeable Notes 2026 Exchangeable Notes 2030 Exchangeable Notes Contractual interest expense $ 1,132 $ 1,258 $ 2,875 Amortization of original issue discount 3,006 4,109 3,124 Amortization of debt issuance costs 375 294 148 Total interest expense recognized $ 4,513 $ 5,661 $ 6,147 Nine Months Ended September 30, 2019 2022 Exchangeable Notes 2026 Exchangeable Notes 2030 Exchangeable Notes Contractual interest expense $ 3,396 $ 1,705 $ 3,897 Amortization of original issue discount 9,765 5,608 4,270 Amortization of debt issuance costs 2,117 425 233 Total interest expense recognized $ 15,278 $ 7,738 $ 8,400 Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 2022 Exchangeable Notes Contractual interest expense $ 1,138 $ 3,396 Amortization of original issue discount 3,299 9,802 Amortization of debt issuance costs 865 2,619 Total interest expense recognized $ 5,302 $ 15,817 Exchangeable Notes Hedge and Warrants In connection with the Exchangeable Notes offerings, the Company purchased call options allowing the Company to purchase (subject to adjustment upon the occurrence of specified events) the same number of shares that would be issuable upon the exchange of the applicable Exchangeable Notes at the price per share set forth below (the "Exchangeable Notes Hedge"), and sold warrants allowing the counterparty to purchase (subject to adjustment upon the occurrence of specified events) shares at the per share price set forth below (the "Exchangeable Notes Warrants"). The Exchangeable Notes Hedges 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, Inc., IAC FinanceCo 2, Inc. or IAC FinanceCo 3, Inc. is required to make in excess of the principal amount of the exchanged notes. The Exchangeable Notes 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 respective strike prices. The following tables presents details of the Exchangeable Notes Hedges and Warrants (shares in millions): Number of Shares* Approximate Equivalent Exchange Price per Share* 2022 Exchangeable Notes Hedge 3.4 $ 152.18 2026 Exchangeable Notes Hedge 1.9 $ 302.77 2030 Exchangeable Notes Hedge 2.0 $ 291.35 Number of Shares* Strike Price per Share* 2022 Exchangeable Notes Warrants 3.4 $ 229.70 2026 Exchangeable Notes Warrants 1.9 $ 457.02 2030 Exchangeable Notes Warrants 2.0 $ 457.02 _____________________ * Subject to adjustment upon the occurrence of specified events. IAC Senior Notes On August 23, 2019, the Company redeemed all outstanding 4.75% Senior Notes for $34.5 million plus a premium of $0.5 million and accrued interest of $0.3 million . IAC Credit Facility As of September 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 September 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 September 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 certain of our wholly-owned domestic subsidiaries 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. Maturities of long-term debt as of September 30, 2019 (in thousands): Remainder of 2019 $ 3,438 2020 13,750 2021 13,750 2022 970,000 2023 192,500 After 2023 2,350,000 Total 3,543,438 Less: current portion of long-term debt 13,750 Less: unamortized original issue discount 368,976 Less: unamortized debt issuance costs 48,830 Total long-term debt, net $ 3,111,882

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE LOSS	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
ACCUMULATED OTHER COMPREHENSIVE LOSS	ACCUMULATED OTHER COMPREHENSIVE LOSS The following tables present the components of accumulated other comprehensive (loss) income and items reclassified out of accumulated other comprehensive loss into earnings: Three Months Ended September 30, 2019 Foreign Currency Translation Adjustment Accumulated Other Comprehensive Loss (In thousands) Balance as of July 1 $ (125,705 ) $ (125,705 ) Other comprehensive loss (18,389 ) (18,389 ) Net current period other comprehensive loss (18,389 ) (18,389 ) Allocation of accumulated other comprehensive loss related to the noncontrolling interests (510 ) (510 ) Balance as of September 30 $ (144,604 ) $ (144,604 ) Three Months Ended September 30, 2018 Foreign Currency Translation Adjustment Unrealized Gains (Losses) On Available-For-Sale Debt Securities Accumulated Other Comprehensive (Loss) Income (In thousands) Balance as of July 1 $ (112,730 ) $ 13 $ (112,717 ) Other comprehensive loss (502 ) (27 ) (529 ) Net current period other comprehensive loss (502 ) (27 ) (529 ) Allocation of accumulated other comprehensive income related to the noncontrolling interests 391 — 391 Balance as of September 30 $ (112,841 ) $ (14 ) $ (112,855 ) Nine Months Ended September 30, 2019 Foreign Currency Translation Adjustment Unrealized Gains (Losses) 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 loss (16,299 ) (4 ) (16,303 ) Net current period other comprehensive loss (16,299 ) (4 ) (16,303 ) Allocation of accumulated other comprehensive income related to the noncontrolling interests 421 — 421 Balance as of September 30 $ (144,604 ) $ — $ (144,604 ) Nine Months Ended September 30, 2018 Foreign Currency Translation Adjustment Unrealized Losses On Available-For-Sale Debt Securities Accumulated Other Comprehensive (Loss) Income (In thousands) Balance as of January 1 $ (103,568 ) $ — $ (103,568 ) Other comprehensive loss before reclassifications (9,550 ) (14 ) (9,564 ) Amounts reclassified to earnings (52 ) — (52 ) Net current period other comprehensive loss (9,602 ) (14 ) (9,616 ) Allocation of accumulated other comprehensive income related to the noncontrolling interests 329 — 329 Balance as of September 30 $ (112,841 ) $ (14 ) $ (112,855 ) The amount reclassified out of foreign currency translation adjustment into earnings for the nine months ended September 30, 2018 relate to the liquidation of an international subsidiary. At both September 30, 2019 and 2018 , there was no tax benefit or provision on the accumulated other comprehensive loss.

EARNINGS PER SHARE

EARNINGS PER SHARE	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE The following table sets forth the computation of basic and diluted earnings per share attributable to IAC shareholders: Three Months Ended September 30, 2019 2018 Basic Diluted Basic Diluted (In thousands, except per share data) Numerator: Net earnings $ 159,772 $ 159,772 $ 171,577 $ 171,577 Net earnings attributable to noncontrolling interests (31,228 ) (31,228 ) (25,803 ) (25,803 ) Impact from publicly-traded subsidiaries' dilutive securities (a) — (7,342 ) — (8,336 ) Net earnings attributable to IAC shareholders $ 128,544 $ 121,202 $ 145,774 $ 137,438 Denominator: Weighted average basic shares outstanding 84,393 84,393 83,433 83,433 Dilutive securities (a) (b) (c) (d) — 5,095 — 8,542 Denominator for earnings per share—weighted average shares (a) (b) (c) (d) 84,393 89,488 83,433 91,975 Earnings per share attributable to IAC shareholders: Earnings per share $ 1.52 $ 1.35 $ 1.75 $ 1.49 Nine Months Ended September 30, 2019 2018 Basic Diluted Basic Diluted (In thousands, except per share data) Numerator: Net earnings $ 419,548 $ 419,548 $ 540,270 $ 540,270 Net earnings attributable to noncontrolling interests (88,842 ) (88,842 ) (105,061 ) (105,061 ) Impact from publicly-traded subsidiaries' dilutive securities (a) — (20,174 ) — (19,490 ) Net earnings attributable to IAC shareholders $ 330,706 $ 310,532 $ 435,209 $ 415,719 Denominator: Weighted average basic shares outstanding 84,147 84,147 83,342 83,342 Dilutive securities (a) (b) (c) (d) — 5,799 — 8,076 Denominator for earnings per share—weighted average shares (a) (b) (c) (d) 84,147 89,946 83,342 91,418 Earnings per share attributable to IAC shareholders: Earnings per share $ 3.93 $ 3.45 $ 5.22 $ 4.55 _____________________ (a) IAC has the option to settle certain MTCH and ANGI stock-based awards in its shares. For the three and nine months ended September 30, 2019 and for the three months ended September 30, 2018, it is more dilutive for IAC to settle certain ANGI equity awards and MTCH to settle certain MTCH equity awards. For the nine months ended September 30, 2018 , it is more dilutive for IAC to settle certain MTCH and ANGI equity awards. (b) If the effect is dilutive, weighted average common shares outstanding include the incremental shares that would be issued upon the assumed exercise of stock options, warrants and subsidiary denominated equity, exchange of the Company's Exchangeable Notes and vesting of restricted stock units. For the three and nine months ended September 30, 2019 , 7.7 million and 11.2 million , respectively, potentially dilutive securities are excluded from the calculation of diluted earnings per share because their inclusion would have been anti-dilutive. For both the three and nine months ended September 30, 2018 , 3.4 million potentially dilutive securities are excluded from the calculation of diluted earnings per share because their inclusion would have been anti-dilutive. (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 nine months ended September 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 nine months ended September 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 2022 Exchangeable Notes, the 2026 Exchangeable Notes and the 2030 Exchangeable Notes, respectively. The average price of IAC common stock was $238.90 and $223.32 for the three and nine months ended September 30, 2019 , respectively, and the dilutive impact of the 2022 Exchangeable Notes, which is the only series of Exchangeable Notes that is currently dilutive, was 1.2 million and 1.1 million shares, respectively. For the three and nine months ended September 30, 2018 , the average price of IAC common stock was $181.60 and $160.85 , respectively, and the dilutive impact of the 2022 Exchangeable Notes was 0.6 million and 0.2 million

SEGMENT INFORMATION

SEGMENT INFORMATION	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
SEGMENT INFORMATION	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 September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Revenue: Match Group $ 541,493 $ 443,943 $ 1,504,091 $ 1,272,506 ANGI Homeservices 357,358 303,116 1,004,697 853,249 Vimeo 52,145 40,304 141,439 115,432 Dotdash 40,285 30,053 111,974 90,841 Applications 126,071 153,973 402,557 429,034 Emerging & Other 129,581 133,345 374,871 398,026 Inter-segment eliminations (59 ) (142 ) (254 ) (299 ) Total $ 1,246,874 $ 1,104,592 $ 3,539,375 $ 3,158,789 The following table presents the revenue of the Company's segments disaggregated by type of service: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Match Group Direct revenue: North America $ 268,863 $ 233,643 $ 758,135 $ 667,163 International 262,086 197,902 714,076 564,846 Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Total Direct revenue 530,949 431,545 1,472,211 1,232,009 Indirect revenue (principally advertising revenue) 10,544 12,398 31,880 40,497 Total Match Group revenue $ 541,493 $ 443,943 $ 1,504,091 $ 1,272,506 ANGI Homeservices Marketplace: Consumer connection revenue $ 252,552 $ 195,065 $ 695,370 $ 531,297 Membership subscription revenue 16,237 17,034 49,239 49,226 Other revenue 1,727 950 5,360 2,869 Total Marketplace revenue 270,516 213,049 749,969 583,392 Advertising and other revenue 68,628 73,545 195,569 216,733 Total North America revenue 339,144 286,594 945,538 800,125 Consumer connection revenue 14,125 12,022 46,480 38,885 Membership subscription revenue 3,465 4,217 10,820 13,405 Advertising and other revenue 624 283 1,859 834 Total Europe revenue 18,214 16,522 59,159 53,124 Total ANGI Homeservices revenue $ 357,358 $ 303,116 $ 1,004,697 $ 853,249 Vimeo Platform revenue $ 52,145 $ 37,245 $ 139,160 $ 106,470 Hardware revenue — 3,059 2,279 8,962 Total Vimeo revenue $ 52,145 $ 40,304 $ 141,439 $ 115,432 Dotdash Advertising revenue $ 29,158 $ 23,949 $ 84,171 $ 71,714 Affiliate commerce commission and other revenue 11,127 6,104 27,803 19,127 Total Dotdash revenue $ 40,285 $ 30,053 $ 111,974 $ 90,841 Applications Desktop: Advertising revenue: Google advertising revenue $ 68,076 $ 110,855 $ 234,211 $ 326,982 Other advertising revenue 3,179 3,416 9,373 7,223 Total advertising revenue 71,255 114,271 243,584 334,205 Subscription and other revenue 3,613 4,271 12,109 16,355 Total Desktop revenue 74,868 118,542 255,693 350,560 Mosaic Group: Subscription and other revenue 49,079 31,157 139,907 63,687 Advertising revenue 2,124 4,274 6,957 14,787 Total Mosaic Group revenue 51,203 35,431 146,864 78,474 Total Applications revenue $ 126,071 $ 153,973 $ 402,557 $ 429,034 Emerging & Other Advertising revenue: Google advertising revenue $ 101,609 $ 84,955 $ 303,207 $ 266,061 Other advertising revenue 11,955 20,918 27,231 50,986 Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Total advertising revenue 113,564 105,873 330,438 317,047 Other revenue 16,017 27,472 44,433 80,979 Total Emerging & Other revenue $ 129,581 $ 133,345 $ 374,871 $ 398,026 Revenue by geography is based on where the customer is located. Geographic information about revenue and long-lived assets is presented below: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Revenue: United States $ 807,188 $ 738,599 $ 2,293,664 $ 2,104,750 All other countries 439,686 365,993 1,245,711 1,054,039 Total $ 1,246,874 $ 1,104,592 $ 3,539,375 $ 3,158,789 September 30, December 31, (In thousands) Long-lived assets (excluding goodwill and intangible assets): United States $ 336,055 $ 289,756 All other countries 25,609 29,044 Total $ 361,664 $ 318,800 The following tables present operating income (loss) and Adjusted EBTIDA by reportable segment: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Operating Income (Loss): Match Group $ 176,604 $ 139,895 $ 468,330 $ 402,293 ANGI Homeservices 24,726 33,515 32,488 46,021 Vimeo (11,155 ) (6,161 ) (40,555 ) (25,502 ) Dotdash 3,695 2,416 13,752 6,946 Applications 39,099 33,041 85,422 91,579 Emerging & Other (1,821 ) 10,893 (6,130 ) 23,465 Corporate (45,296 ) (40,767 ) (133,272 ) (113,583 ) Total $ 185,852 $ 172,832 $ 420,035 $ 431,219 Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Adjusted EBITDA (a) : Match Group $ 206,131 $ 165,039 $ 564,720 $ 478,341 ANGI Homeservices $ 58,923 $ 77,700 $ 147,534 $ 181,319 Vimeo $ (7,997 ) $ (4,229 ) $ (33,661 ) $ (19,644 ) Dotdash $ 7,026 $ 3,071 $ 22,551 $ 8,914 Applications $ 25,433 $ 34,989 $ 80,440 $ 97,145 Emerging & Other $ (1,529 ) $ 12,235 $ (5,141 ) $ 28,733 Corporate $ (21,945 ) $ (21,478 ) $ (60,751 ) $ (54,038 ) _____________________ (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 September 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 $ 176,604 $ 20,805 $ 8,081 $ 641 $ — $ 206,131 ANGI Homeservices 24,726 $ 8,784 $ 11,244 $ 14,169 $ — $ 58,923 Vimeo (11,155 ) $ — $ 39 $ 3,119 $ — $ (7,997 ) Dotdash 3,695 $ — $ 216 $ 3,115 $ — $ 7,026 Applications 39,099 $ — $ 331 $ 2,142 $ (16,139 ) $ 25,433 Emerging & Other (1,821 ) $ — $ 292 $ — $ — $ (1,529 ) Corporate (45,296 ) $ 20,464 $ 2,887 $ — $ — $ (21,945 ) Operating income 185,852 Interest expense (42,132 ) Other income, net 1,229 Earnings before income taxes 144,949 Income tax benefit 14,823 Net earnings 159,772 Net earnings attributable to noncontrolling interests (31,228 ) Net earnings attributable to IAC shareholders $ 128,544 Three Months Ended September 30, 2018 Operating Income (Loss) Stock-Based Compensation Expense Depreciation Amortization of Intangibles Acquisition-related Contingent Consideration Fair Value Adjustments Adjusted EBITDA (In thousands) Match Group $ 139,895 $ 16,141 $ 8,513 $ 435 $ 55 $ 165,039 ANGI Homeservices 33,515 $ 22,474 $ 6,100 $ 15,611 $ — $ 77,700 Vimeo (6,161 ) $ — $ 291 $ 1,641 $ — $ (4,229 ) Dotdash 2,416 $ — $ 246 $ 409 $ — $ 3,071 Applications 33,041 $ — $ 617 $ 1,331 $ — $ 34,989 Emerging & Other 10,893 $ 323 $ 294 $ 725 $ — $ 12,235 Corporate (40,767 ) $ 16,425 $ 2,864 $ — $ — $ (21,478 ) Operating income 172,832 Interest expense (27,610 ) Other income, net 8,113 Earnings before income taxes 153,335 Income tax benefit 18,242 Net earnings 171,577 Net earnings attributable to noncontrolling interests (25,803 ) Net earnings attributable to IAC shareholders $ 145,774 Nine Months Ended September 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 $ 468,330 $ 70,817 $ 24,109 $ 1,464 $ — $ 564,720 ANGI Homeservices 32,488 $ 45,586 $ 27,039 $ 42,421 $ — $ 147,534 Vimeo (40,555 ) $ — $ 364 $ 6,530 $ — $ (33,661 ) Dotdash 13,752 $ — $ 660 $ 8,139 $ — $ 22,551 Applications 85,422 $ — $ 1,139 $ 6,872 $ (12,993 ) $ 80,440 Emerging & Other (6,130 ) $ — $ 839 $ 150 $ — $ (5,141 ) Corporate (133,272 ) $ 63,519 $ 9,002 $ — $ — $ (60,751 ) Operating income 420,035 Interest expense (110,481 ) Other income, net 47,852 Earnings before income taxes 357,406 Income tax benefit 62,142 Net earnings 419,548 Net earnings attributable to noncontrolling interests (88,842 ) Net earnings attributable to IAC shareholders $ 330,706 Nine Months Ended September 30, 2018 Operating Income (Loss) Stock-Based Compensation Expense Depreciation Amortization of Intangibles Acquisition-related Contingent Consideration Fair Value Adjustments Adjusted EBITDA (In thousands) Match Group $ 402,293 $ 49,810 $ 25,059 $ 914 $ 265 $ 478,341 ANGI Homeservices 46,021 $ 69,433 $ 18,170 $ 47,695 $ — $ 181,319 Vimeo (25,502 ) $ — $ 947 $ 4,911 $ — $ (19,644 ) Dotdash 6,946 $ — $ 741 $ 1,227 $ — $ 8,914 Applications 91,579 $ — $ 2,145 $ 3,421 $ — $ 97,145 Emerging & Other 23,465 $ 1,747 $ 1,396 $ 2,125 $ — $ 28,733 Corporate (113,583 ) $ 51,016 $ 8,529 $ — $ — $ (54,038 ) Operating income 431,219 Interest expense (81,471 ) Other income, net 174,635 Earnings before income taxes 524,383 Income tax benefit 15,887 Net earnings 540,270 Net earnings attributable to noncontrolling interests (105,061 ) Net earnings attributable to IAC shareholders $ 435,209

CONSOLIDATED FINANCIAL STATEMEN

CONSOLIDATED FINANCIAL STATEMENT DETAILS	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
CONSOLIDATED FINANCIAL STATEMENT DETAILS	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: September 30, 2019 December 31, 2018 September 30, 2018 December 31, 2017 (In thousands) Cash and cash equivalents $ 2,946,180 $ 2,131,632 $ 1,670,984 $ 1,630,809 Restricted cash included in other current assets 1,570 1,633 344 2,873 Restricted cash included in other non-current assets 403 420 433 — Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows $ 2,948,153 $ 2,133,685 $ 1,671,761 $ 1,633,682 Restricted cash at September 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 September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Other income, net $1,229 $8,113 $47,852 $174,635 For the three months ended September 30, 2019 and 2018 Other income, net in 2019 includes: $15.9 million of interest income; an unrealized reduction of $8.7 million in the estimated fair value of a warrant; and a $4.6 million unrealized loss related to our investment in Pinterest, which is carried at fair value following its initial public offering in April 2019. Other income, net in 2018 includes: interest income of $8.1 million ; and $0.8 million in net foreign currency exchange gains due primarily to the strengthening of the U.S. dollar relative to the British Pound during the three months ended September 30, 2018. For the nine months ended September 30, 2019 and 2018 Other income, net in 2019 includes: $42.8 million of interest income; a $25.3 million unrealized gain related to our investment in Pinterest; an unrealized reduction of $8.7 million in the estimated fair value of a warrant; a realized loss of $8.2 million related to the sale of Vimeo's hardware business in the first quarter of 2019; and a $1.3 million mark-to-market charge pertaining to a subsidiary denominated equity instrument. 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; $20.2 million of interest income; and $2.9 million in net foreign currency exchange gains due primarily to the strengthening of the U.S. dollar relative to the British Pound during the nine months ended September 30, 2018.

CONTINGENCIES

CONTINGENCIES	9 Months Ended
	Sep. 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. Tinder Optionholder Litigation against IAC and Match Group 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 certain of the plaintiffs of their 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. On June 21, 2019, the defendants filed a notice of appeal from the court’s partial denial of their motion to dismiss, and the parties thereafter briefed the appeal. On October 29, 2019, the Appellate Division, First Department, issued an order affirming the lower court’s decision. 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. Document discovery is largely complete, and deposition discovery is in abeyance pursuant to the court’s suggestion that the parties pursue mediation of their dispute. IAC and Match Group believe that the allegations in this lawsuit are without merit and will continue to defend vigorously against it.

THE COMPANY AND SUMMARY OF SI_2

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
	Sep. 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 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 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 September 30, 2019 and December 31, 2018 , the Company did not have any investments accounted for using the equity method. 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.
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 the 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 nine months ended September 30, 2019, the Company recognized $346.5 million of revenue that was included in the deferred revenue balance as of December 31, 2018. During the nine months ended September 30, 2018, the Company recognized $317.2 million of revenue that was included in the deferred revenue balance as of January 1, 2018. The current and non-current deferred revenue balances at September 30, 2019 are $414.3 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.
Certain Risks and Concentrations - Services Agreement with Google	Certain Risks and Concentrations—Services Agreement with Google
Adoption of ASU No. 2016-02, Leases (Topic 842)	Adoption of ASU No. 2016-02, Leases (Topic 842) The Company adopted ASU No. 2016-02, Leases (Topic 842) ("ASC 842") effective January 1, 2019. ASC 842 superseded previously existing guidance on accounting for leases and generally requires all leases to be recognized in the statement of financial position. The adoption of ASC 842 resulted in the recognition of $154.7 million of right-of-use assets ("ROU assets") and related lease liabilities as of January 1, 2019, with no cumulative effect adjustment. The adoption of ASC 842 had no impact on the Company’s consolidated results of operations or 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)

LEASES (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Schedule of Supplemental Balance Sheet Information of Leases	Leases Balance Sheet Classification September 30, 2019 (In thousands) Assets: Right-of-use assets Right-of-use assets $ 177,797 Liabilities: Current lease liabilities Accrued expenses and other current liabilities 33,029 Long-term lease liabilities Other long-term liabilities 198,962 Total lease liabilities $ 231,991
Schedule of Lease Cost and Other Information	Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 (In thousands) Other Information: Right-of-use assets obtained in exchange for lease liabilities $ 6,699 $ 59,857 Cash paid for amounts included in the measurement of lease liabilities $ 10,719 $ 34,433 Lease Cost Income Statement Classification Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 (In thousands) Fixed lease cost Cost of revenue $ 975 $ 3,181 Fixed lease cost Selling and marketing expense 2,836 7,747 Fixed lease cost General and administrative expense 7,424 24,014 Fixed lease cost Product development expense 450 1,050 Total fixed lease cost (a) 11,685 35,992 Variable lease cost Cost of revenue 90 354 Variable lease cost Selling and marketing expense 337 1,007 Variable lease cost General and administrative expense 1,799 5,487 Variable lease cost Product development expense 74 173 Total variable lease cost 2,300 7,021 Net lease cost $ 13,985 $ 43,013 _____________________ (a) Includes approximately $1.1 million and $4.2 million of short-term lease cost and $0.6 million and $1.6 million of sublease income for the three and nine months ended September 30, 2019 , respectively.
Schedule of Maturities of Operating Lease Liabilities	Maturities of lease liabilities as of September 30, 2019 (in thousands) (b) : Remainder of 2019 $ 9,565 2020 46,199 2021 40,761 2022 33,659 2023 28,836 After 2023 249,912 Total 408,932 Less: Interest 176,941 Present value of lease liabilities $ 231,991 _____________________ (b) Lease payments exclude $6.0 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 September 30, 2019 : Remaining lease term 15.2 years Discount rate 6.02 %

FINANCIAL INSTRUMENTS (Tables)

FINANCIAL INSTRUMENTS (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Marketable Securities	At September 30, 2019 and December 31, 2018 , the fair value of marketable securities are as follows: September 30, 2019 December 31, 2018 (In thousands) Marketable equity securities $ 157,174 $ 419 Available-for-sale marketable debt securities — 123,246 Total marketable securities $ 157,174 $ 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 Gross Gross 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 September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Proceeds from maturities of available-for-sale marketable debt securities $ — $ 115,000 $ 163,500 $ 125,000
Schedule of Realized and Unrealized Gains and Losses	The following table presents a summary of realized and unrealized gains and losses recorded in other income (expense), net, as adjustments to the carrying value of equity securities without readily determinable fair values held as of September 30, 2019 and 2018 . Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Upward adjustments (gross unrealized gains) $ 53 $ — $ 53 $ 128,786 Downward adjustments including impairment (gross unrealized losses) (543 ) — (1,193 ) (2,588 ) Total $ (490 ) $ — $ (1,140 ) $ 126,198 Realized and unrealized gains and losses for the Company's marketable equity securities and investments without readily determinable fair values for the three and nine months ended September 30, 2019 and 2018 are as follows: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Realized (losses) gains, net, for equity securities sold $ (8 ) $ 702 $ 2,136 $ 27,874 Unrealized (losses) gains, net, on equity securities held (5,066 ) (115 ) 24,181 126,444 Total (losses) gains recognized, net, in other income, net $ (5,074 ) $ 587 $ 26,317 $ 154,318
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following tables present the Company's financial instruments that are measured at fair value on a recurring basis: September 30, 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 $ 818,158 $ — $ — $ 818,158 Treasury discount notes — 1,349,257 — 1,349,257 Time deposits — 145,035 — 145,035 Marketable securities: Marketable equity security 157,174 — — 157,174 Other non-current assets: Warrant — — 8,929 8,929 Total $ 975,332 $ 1,494,292 $ 8,929 $ 2,478,553 Liabilities: Contingent consideration arrangement $ — $ — $ (13,664 ) $ (13,664 ) 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 following tables present the changes in the Company's financial instruments that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3): Three Months Ended September 30, 2019 2018 Warrant Contingent Contingent (In thousands) Balance at July 1 $ — $ (29,803 ) $ (1,910 ) Total net (losses) gains: Included in earnings: Fair value adjustments (8,689 ) 16,139 (55 ) Included in other comprehensive loss — — (15 ) Fair value date of acquisition 17,618 — — Balance at September 30 $ 8,929 $ (13,664 ) $ (1,980 ) Nine Months Ended September 30, 2019 2018 Warrant Contingent Contingent (In thousands) Balance at January 1 $ — $ (28,631 ) $ (2,647 ) Total net (losses) gains: Included in earnings: Fair value adjustments (8,689 ) 12,993 (265 ) Included in other comprehensive loss — (14 ) (16 ) Fair value at date of acquisition 17,618 — — Settlements — 1,988 948 Balance at September 30 $ 8,929 $ (13,664 ) $ (1,980 )
Schedule of Carrying Value and the Fair Value of Financial Instruments Measured at Fair Value Only for Disclosure Purposes	The following table presents the carrying value and the fair value of financial instruments measured at fair value only for disclosure purposes: September 30, 2019 December 31, 2018 Carrying Fair Carrying Fair (In thousands) Current portion of long-term debt $ (13,750 ) $ (13,681 ) $ (13,750 ) $ (12,753 ) Long-term debt, net (a) (3,111,882 ) (3,934,574 ) (2,245,548 ) (2,460,204 ) _____________________ (a) At September 30, 2019 and December 31, 2018 , the carrying value of long-term debt, net includes unamortized original issue discount and debt issuance costs of $417.8 million and $88.9 million , respectively .

LONG-TERM DEBT (Tables)

LONG-TERM DEBT (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Schedule of Long-term Debt	The following table sets forth the components of the Exchangeable Notes as of September 30, 2019 and December 31, 2018 (in thousands): 2022 Exchangeable Notes 2026 Exchangeable Notes 2030 Exchangeable Notes September 30, 2019 Liability component: Principal $ 517,500 $ 575,000 $ 575,000 Less: unamortized original issue discount 44,259 133,188 184,943 Net carrying value of the liability component $ 473,241 $ 441,812 $ 390,057 Equity component $ 70,363 $ 138,796 $ 189,213 2022 Exchangeable Notes December 31, 2018 Liability component: Principal $ 517,500 Less: unamortized original issue discount 54,025 Net carrying value of the liability component $ 463,475 Equity component $ 70,363 The following table sets forth interest expense recognized related to the Exchangeable Notes (in thousands): Three Months Ended September 30, 2019 2022 Exchangeable Notes 2026 Exchangeable Notes 2030 Exchangeable Notes Contractual interest expense $ 1,132 $ 1,258 $ 2,875 Amortization of original issue discount 3,006 4,109 3,124 Amortization of debt issuance costs 375 294 148 Total interest expense recognized $ 4,513 $ 5,661 $ 6,147 Nine Months Ended September 30, 2019 2022 Exchangeable Notes 2026 Exchangeable Notes 2030 Exchangeable Notes Contractual interest expense $ 3,396 $ 1,705 $ 3,897 Amortization of original issue discount 9,765 5,608 4,270 Amortization of debt issuance costs 2,117 425 233 Total interest expense recognized $ 15,278 $ 7,738 $ 8,400 Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 2022 Exchangeable Notes Contractual interest expense $ 1,138 $ 3,396 Amortization of original issue discount 3,299 9,802 Amortization of debt issuance costs 865 2,619 Total interest expense recognized $ 5,302 $ 15,817 The following table presents detail of the exchangeable feature: Number of shares of the Company's Common Stock into which each $1,000 of Principal of the Exchangeable Notes is Exchangeable* Approximate Equivalent Exchange Price per Share* Exchangeable Date 2022 Exchangeable Notes 6.5713 $ 152.18 July 1, 2022 2026 Exchangeable Notes 3.3028 $ 302.77 March 15, 2026 2030 Exchangeable Notes 3.4323 $ 291.35 October 15, 2029 _____________________ * Subject to adjustment upon the occurrence of specified events. At September 30, 2019 and December 31, 2018 , long-term debt consists of: September 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 15 350,000 — Total MTCH long-term debt 1,625,000 1,535,000 Less: unamortized original issue discount 6,586 7,352 Less: unamortized debt issuance costs 15,786 11,737 Total MTCH debt, net 1,602,628 1,515,911 ANGI Debt: ANGI Term Loan due November 5, 2023 250,938 261,250 Less: current portion of ANGI Term Loan 13,750 13,750 Less: unamortized debt issuance costs 1,942 2,529 Total ANGI debt, net 235,246 244,971 IAC Debt: 0.875% Exchangeable Senior Notes due October 1, 2022 (the "2022 Exchangeable Notes"); interest payable each April 1 and October 1 517,500 517,500 0.875% Exchangeable Senior Notes due June 15, 2026 (the "2026 Exchangeable Notes"); 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 "2030 Exchangeable Notes"); interest payable each January 15 and July 15; commencing on January 15, 2020 575,000 — 4.75% Senior Notes due December 15, 2022 (the "4.75% Senior Notes"); interest payable each June 15 and December 15 — 34,489 Total IAC long-term debt 1,667,500 551,989 Less: unamortized original issue discount 362,390 54,025 Less: unamortized debt issuance costs 31,102 13,298 Total IAC debt, net 1,274,008 484,666 Total long-term debt, net $ 3,111,882 $ 2,245,548
Schedule of Exchangeable Notes Hedges and Warrants	The following tables presents details of the Exchangeable Notes Hedges and Warrants (shares in millions): Number of Shares* Approximate Equivalent Exchange Price per Share* 2022 Exchangeable Notes Hedge 3.4 $ 152.18 2026 Exchangeable Notes Hedge 1.9 $ 302.77 2030 Exchangeable Notes Hedge 2.0 $ 291.35 Number of Shares* Strike Price per Share* 2022 Exchangeable Notes Warrants 3.4 $ 229.70 2026 Exchangeable Notes Warrants 1.9 $ 457.02 2030 Exchangeable Notes Warrants 2.0 $ 457.02 _____________________ * Subject to adjustment upon the occurrence of specified events.
Schedule of Maturities of Long-term Debt	Maturities of long-term debt as of September 30, 2019 (in thousands): Remainder of 2019 $ 3,438 2020 13,750 2021 13,750 2022 970,000 2023 192,500 After 2023 2,350,000 Total 3,543,438 Less: current portion of long-term debt 13,750 Less: unamortized original issue discount 368,976 Less: unamortized debt issuance costs 48,830 Total long-term debt, net $ 3,111,882

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)	9 Months Ended
	Sep. 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 September 30, 2019 Foreign Currency Translation Adjustment Accumulated Other Comprehensive Loss (In thousands) Balance as of July 1 $ (125,705 ) $ (125,705 ) Other comprehensive loss (18,389 ) (18,389 ) Net current period other comprehensive loss (18,389 ) (18,389 ) Allocation of accumulated other comprehensive loss related to the noncontrolling interests (510 ) (510 ) Balance as of September 30 $ (144,604 ) $ (144,604 ) Three Months Ended September 30, 2018 Foreign Currency Translation Adjustment Unrealized Gains (Losses) On Available-For-Sale Debt Securities Accumulated Other Comprehensive (Loss) Income (In thousands) Balance as of July 1 $ (112,730 ) $ 13 $ (112,717 ) Other comprehensive loss (502 ) (27 ) (529 ) Net current period other comprehensive loss (502 ) (27 ) (529 ) Allocation of accumulated other comprehensive income related to the noncontrolling interests 391 — 391 Balance as of September 30 $ (112,841 ) $ (14 ) $ (112,855 ) Nine Months Ended September 30, 2019 Foreign Currency Translation Adjustment Unrealized Gains (Losses) 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 loss (16,299 ) (4 ) (16,303 ) Net current period other comprehensive loss (16,299 ) (4 ) (16,303 ) Allocation of accumulated other comprehensive income related to the noncontrolling interests 421 — 421 Balance as of September 30 $ (144,604 ) $ — $ (144,604 ) Nine Months Ended September 30, 2018 Foreign Currency Translation Adjustment Unrealized Losses On Available-For-Sale Debt Securities Accumulated Other Comprehensive (Loss) Income (In thousands) Balance as of January 1 $ (103,568 ) $ — $ (103,568 ) Other comprehensive loss before reclassifications (9,550 ) (14 ) (9,564 ) Amounts reclassified to earnings (52 ) — (52 ) Net current period other comprehensive loss (9,602 ) (14 ) (9,616 ) Allocation of accumulated other comprehensive income related to the noncontrolling interests 329 — 329 Balance as of September 30 $ (112,841 ) $ (14 ) $ (112,855 )

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	9 Months Ended
	Sep. 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 September 30, 2019 2018 Basic Diluted Basic Diluted (In thousands, except per share data) Numerator: Net earnings $ 159,772 $ 159,772 $ 171,577 $ 171,577 Net earnings attributable to noncontrolling interests (31,228 ) (31,228 ) (25,803 ) (25,803 ) Impact from publicly-traded subsidiaries' dilutive securities (a) — (7,342 ) — (8,336 ) Net earnings attributable to IAC shareholders $ 128,544 $ 121,202 $ 145,774 $ 137,438 Denominator: Weighted average basic shares outstanding 84,393 84,393 83,433 83,433 Dilutive securities (a) (b) (c) (d) — 5,095 — 8,542 Denominator for earnings per share—weighted average shares (a) (b) (c) (d) 84,393 89,488 83,433 91,975 Earnings per share attributable to IAC shareholders: Earnings per share $ 1.52 $ 1.35 $ 1.75 $ 1.49 Nine Months Ended September 30, 2019 2018 Basic Diluted Basic Diluted (In thousands, except per share data) Numerator: Net earnings $ 419,548 $ 419,548 $ 540,270 $ 540,270 Net earnings attributable to noncontrolling interests (88,842 ) (88,842 ) (105,061 ) (105,061 ) Impact from publicly-traded subsidiaries' dilutive securities (a) — (20,174 ) — (19,490 ) Net earnings attributable to IAC shareholders $ 330,706 $ 310,532 $ 435,209 $ 415,719 Denominator: Weighted average basic shares outstanding 84,147 84,147 83,342 83,342 Dilutive securities (a) (b) (c) (d) — 5,799 — 8,076 Denominator for earnings per share—weighted average shares (a) (b) (c) (d) 84,147 89,946 83,342 91,418 Earnings per share attributable to IAC shareholders: Earnings per share $ 3.93 $ 3.45 $ 5.22 $ 4.55 _____________________ (a) IAC has the option to settle certain MTCH and ANGI stock-based awards in its shares. For the three and nine months ended September 30, 2019 and for the three months ended September 30, 2018, it is more dilutive for IAC to settle certain ANGI equity awards and MTCH to settle certain MTCH equity awards. For the nine months ended September 30, 2018 , it is more dilutive for IAC to settle certain MTCH and ANGI equity awards. (b) If the effect is dilutive, weighted average common shares outstanding include the incremental shares that would be issued upon the assumed exercise of stock options, warrants and subsidiary denominated equity, exchange of the Company's Exchangeable Notes and vesting of restricted stock units. For the three and nine months ended September 30, 2019 , 7.7 million and 11.2 million , respectively, potentially dilutive securities are excluded from the calculation of diluted earnings per share because their inclusion would have been anti-dilutive. For both the three and nine months ended September 30, 2018 , 3.4 million potentially dilutive securities are excluded from the calculation of diluted earnings per share because their inclusion would have been anti-dilutive. (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 nine months ended September 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 nine months ended September 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 2022 Exchangeable Notes, the 2026 Exchangeable Notes and the 2030 Exchangeable Notes, respectively. The average price of IAC common stock was $238.90 and $223.32 for the three and nine months ended September 30, 2019 , respectively, and the dilutive impact of the 2022 Exchangeable Notes, which is the only series of Exchangeable Notes that is currently dilutive, was 1.2 million and 1.1 million shares, respectively. For the three and nine months ended September 30, 2018 , the average price of IAC common stock was $181.60 and $160.85 , respectively, and the dilutive impact of the 2022 Exchangeable Notes was 0.6 million and 0.2 million

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	9 Months Ended
	Sep. 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 September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Operating Income (Loss): Match Group $ 176,604 $ 139,895 $ 468,330 $ 402,293 ANGI Homeservices 24,726 33,515 32,488 46,021 Vimeo (11,155 ) (6,161 ) (40,555 ) (25,502 ) Dotdash 3,695 2,416 13,752 6,946 Applications 39,099 33,041 85,422 91,579 Emerging & Other (1,821 ) 10,893 (6,130 ) 23,465 Corporate (45,296 ) (40,767 ) (133,272 ) (113,583 ) Total $ 185,852 $ 172,832 $ 420,035 $ 431,219 Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Adjusted EBITDA (a) : Match Group $ 206,131 $ 165,039 $ 564,720 $ 478,341 ANGI Homeservices $ 58,923 $ 77,700 $ 147,534 $ 181,319 Vimeo $ (7,997 ) $ (4,229 ) $ (33,661 ) $ (19,644 ) Dotdash $ 7,026 $ 3,071 $ 22,551 $ 8,914 Applications $ 25,433 $ 34,989 $ 80,440 $ 97,145 Emerging & Other $ (1,529 ) $ 12,235 $ (5,141 ) $ 28,733 Corporate $ (21,945 ) $ (21,478 ) $ (60,751 ) $ (54,038 ) _____________________ (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 table presents revenue by reportable segment: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Revenue: Match Group $ 541,493 $ 443,943 $ 1,504,091 $ 1,272,506 ANGI Homeservices 357,358 303,116 1,004,697 853,249 Vimeo 52,145 40,304 141,439 115,432 Dotdash 40,285 30,053 111,974 90,841 Applications 126,071 153,973 402,557 429,034 Emerging & Other 129,581 133,345 374,871 398,026 Inter-segment eliminations (59 ) (142 ) (254 ) (299 ) Total $ 1,246,874 $ 1,104,592 $ 3,539,375 $ 3,158,789
Schedule of Disaggregation of Revenue	The following table presents the revenue of the Company's segments disaggregated by type of service: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Match Group Direct revenue: North America $ 268,863 $ 233,643 $ 758,135 $ 667,163 International 262,086 197,902 714,076 564,846 Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Total Direct revenue 530,949 431,545 1,472,211 1,232,009 Indirect revenue (principally advertising revenue) 10,544 12,398 31,880 40,497 Total Match Group revenue $ 541,493 $ 443,943 $ 1,504,091 $ 1,272,506 ANGI Homeservices Marketplace: Consumer connection revenue $ 252,552 $ 195,065 $ 695,370 $ 531,297 Membership subscription revenue 16,237 17,034 49,239 49,226 Other revenue 1,727 950 5,360 2,869 Total Marketplace revenue 270,516 213,049 749,969 583,392 Advertising and other revenue 68,628 73,545 195,569 216,733 Total North America revenue 339,144 286,594 945,538 800,125 Consumer connection revenue 14,125 12,022 46,480 38,885 Membership subscription revenue 3,465 4,217 10,820 13,405 Advertising and other revenue 624 283 1,859 834 Total Europe revenue 18,214 16,522 59,159 53,124 Total ANGI Homeservices revenue $ 357,358 $ 303,116 $ 1,004,697 $ 853,249 Vimeo Platform revenue $ 52,145 $ 37,245 $ 139,160 $ 106,470 Hardware revenue — 3,059 2,279 8,962 Total Vimeo revenue $ 52,145 $ 40,304 $ 141,439 $ 115,432 Dotdash Advertising revenue $ 29,158 $ 23,949 $ 84,171 $ 71,714 Affiliate commerce commission and other revenue 11,127 6,104 27,803 19,127 Total Dotdash revenue $ 40,285 $ 30,053 $ 111,974 $ 90,841 Applications Desktop: Advertising revenue: Google advertising revenue $ 68,076 $ 110,855 $ 234,211 $ 326,982 Other advertising revenue 3,179 3,416 9,373 7,223 Total advertising revenue 71,255 114,271 243,584 334,205 Subscription and other revenue 3,613 4,271 12,109 16,355 Total Desktop revenue 74,868 118,542 255,693 350,560 Mosaic Group: Subscription and other revenue 49,079 31,157 139,907 63,687 Advertising revenue 2,124 4,274 6,957 14,787 Total Mosaic Group revenue 51,203 35,431 146,864 78,474 Total Applications revenue $ 126,071 $ 153,973 $ 402,557 $ 429,034 Emerging & Other Advertising revenue: Google advertising revenue $ 101,609 $ 84,955 $ 303,207 $ 266,061 Other advertising revenue 11,955 20,918 27,231 50,986 Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Total advertising revenue 113,564 105,873 330,438 317,047 Other revenue 16,017 27,472 44,433 80,979 Total Emerging & Other revenue $ 129,581 $ 133,345 $ 374,871 $ 398,026
Schedule of Revenue and Long-lived Assets, Excluding Goodwill and Intangible Assets, by Geography	Revenue by geography is based on where the customer is located. Geographic information about revenue and long-lived assets is presented below: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Revenue: United States $ 807,188 $ 738,599 $ 2,293,664 $ 2,104,750 All other countries 439,686 365,993 1,245,711 1,054,039 Total $ 1,246,874 $ 1,104,592 $ 3,539,375 $ 3,158,789 September 30, December 31, (In thousands) Long-lived assets (excluding goodwill and intangible assets): United States $ 336,055 $ 289,756 All other countries 25,609 29,044 Total $ 361,664 $ 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 September 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 $ 176,604 $ 20,805 $ 8,081 $ 641 $ — $ 206,131 ANGI Homeservices 24,726 $ 8,784 $ 11,244 $ 14,169 $ — $ 58,923 Vimeo (11,155 ) $ — $ 39 $ 3,119 $ — $ (7,997 ) Dotdash 3,695 $ — $ 216 $ 3,115 $ — $ 7,026 Applications 39,099 $ — $ 331 $ 2,142 $ (16,139 ) $ 25,433 Emerging & Other (1,821 ) $ — $ 292 $ — $ — $ (1,529 ) Corporate (45,296 ) $ 20,464 $ 2,887 $ — $ — $ (21,945 ) Operating income 185,852 Interest expense (42,132 ) Other income, net 1,229 Earnings before income taxes 144,949 Income tax benefit 14,823 Net earnings 159,772 Net earnings attributable to noncontrolling interests (31,228 ) Net earnings attributable to IAC shareholders $ 128,544 Three Months Ended September 30, 2018 Operating Income (Loss) Stock-Based Compensation Expense Depreciation Amortization of Intangibles Acquisition-related Contingent Consideration Fair Value Adjustments Adjusted EBITDA (In thousands) Match Group $ 139,895 $ 16,141 $ 8,513 $ 435 $ 55 $ 165,039 ANGI Homeservices 33,515 $ 22,474 $ 6,100 $ 15,611 $ — $ 77,700 Vimeo (6,161 ) $ — $ 291 $ 1,641 $ — $ (4,229 ) Dotdash 2,416 $ — $ 246 $ 409 $ — $ 3,071 Applications 33,041 $ — $ 617 $ 1,331 $ — $ 34,989 Emerging & Other 10,893 $ 323 $ 294 $ 725 $ — $ 12,235 Corporate (40,767 ) $ 16,425 $ 2,864 $ — $ — $ (21,478 ) Operating income 172,832 Interest expense (27,610 ) Other income, net 8,113 Earnings before income taxes 153,335 Income tax benefit 18,242 Net earnings 171,577 Net earnings attributable to noncontrolling interests (25,803 ) Net earnings attributable to IAC shareholders $ 145,774 Nine Months Ended September 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 $ 468,330 $ 70,817 $ 24,109 $ 1,464 $ — $ 564,720 ANGI Homeservices 32,488 $ 45,586 $ 27,039 $ 42,421 $ — $ 147,534 Vimeo (40,555 ) $ — $ 364 $ 6,530 $ — $ (33,661 ) Dotdash 13,752 $ — $ 660 $ 8,139 $ — $ 22,551 Applications 85,422 $ — $ 1,139 $ 6,872 $ (12,993 ) $ 80,440 Emerging & Other (6,130 ) $ — $ 839 $ 150 $ — $ (5,141 ) Corporate (133,272 ) $ 63,519 $ 9,002 $ — $ — $ (60,751 ) Operating income 420,035 Interest expense (110,481 ) Other income, net 47,852 Earnings before income taxes 357,406 Income tax benefit 62,142 Net earnings 419,548 Net earnings attributable to noncontrolling interests (88,842 ) Net earnings attributable to IAC shareholders $ 330,706 Nine Months Ended September 30, 2018 Operating Income (Loss) Stock-Based Compensation Expense Depreciation Amortization of Intangibles Acquisition-related Contingent Consideration Fair Value Adjustments Adjusted EBITDA (In thousands) Match Group $ 402,293 $ 49,810 $ 25,059 $ 914 $ 265 $ 478,341 ANGI Homeservices 46,021 $ 69,433 $ 18,170 $ 47,695 $ — $ 181,319 Vimeo (25,502 ) $ — $ 947 $ 4,911 $ — $ (19,644 ) Dotdash 6,946 $ — $ 741 $ 1,227 $ — $ 8,914 Applications 91,579 $ — $ 2,145 $ 3,421 $ — $ 97,145 Emerging & Other 23,465 $ 1,747 $ 1,396 $ 2,125 $ — $ 28,733 Corporate (113,583 ) $ 51,016 $ 8,529 $ — $ — $ (54,038 ) Operating income 431,219 Interest expense (81,471 ) Other income, net 174,635 Earnings before income taxes 524,383 Income tax benefit 15,887 Net earnings 540,270 Net earnings attributable to noncontrolling interests (105,061 ) Net earnings attributable to IAC shareholders $ 435,209

CONSOLIDATED FINANCIAL STATEM_2

CONSOLIDATED FINANCIAL STATEMENT DETAILS (Tables)	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Cash and Cash Equivalents	The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheet to the total amounts shown in the consolidated statement of cash flows: September 30, 2019 December 31, 2018 September 30, 2018 December 31, 2017 (In thousands) Cash and cash equivalents $ 2,946,180 $ 2,131,632 $ 1,670,984 $ 1,630,809 Restricted cash included in other current assets 1,570 1,633 344 2,873 Restricted cash included in other non-current assets 403 420 433 — Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows $ 2,948,153 $ 2,133,685 $ 1,671,761 $ 1,633,682
Schedule of 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: September 30, 2019 December 31, 2018 September 30, 2018 December 31, 2017 (In thousands) Cash and cash equivalents $ 2,946,180 $ 2,131,632 $ 1,670,984 $ 1,630,809 Restricted cash included in other current assets 1,570 1,633 344 2,873 Restricted cash included in other non-current assets 403 420 433 — Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows $ 2,948,153 $ 2,133,685 $ 1,671,761 $ 1,633,682
Schedule of Other Income, Net	Other income, net Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 (In thousands) Other income, net $1,229 $8,113 $47,852 $174,635

THE COMPANY AND SUMMARY OF SI_3

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Revenue and Other [Line Items]
Current deferred revenue	$ 414,325		$ 414,325			$ 360,015
Non-current deferred revenue	1,400		1,400			1,700
Deferred revenue recognized during period			346,500	$ 317,200
Capitalized sales commissions where customer relationship period is greater than one year	43,200		43,200			40,500
Consolidated revenue	1,246,874	$ 1,104,592	3,539,375	3,158,789
Accounts receivable related to revenue earned	355,924		355,924			279,189
Goodwill balance	2,852,986		2,852,986			2,726,859
Carrying value of related intangible asset	603,702		603,702			631,422
ROU assets	177,797		177,797			0
Related lease liabilities	231,991		231,991
Google Inc. | Revenue | Customer concentration risk
Revenue and Other [Line Items]
Consolidated revenue	$ 182,500	$ 204,400	$ 574,700	$ 620,700
Concentration risk (as a percent)	15.00%	19.00%	16.00%	20.00%
Google Inc. | Revenue | Customer concentration risk | Applications
Revenue and Other [Line Items]
Consolidated revenue	$ 68,100	$ 110,800	$ 234,100	$ 326,700
Google Inc. | Revenue | Customer concentration risk | Emerging & Other
Revenue and Other [Line Items]
Consolidated revenue	100,300	$ 79,900	298,400	$ 248,200
Google Inc. | Accounts Receivable | Customer concentration risk
Revenue and Other [Line Items]
Accounts receivable related to revenue earned	$ 61,900		$ 61,900			$ 69,100
Accounting Standards Update 2016-02
Revenue and Other [Line Items]
ROU assets					$ 154,700
Related lease liabilities					$ 154,700
Match Group
Revenue and Other [Line Items]
Economic interest (as a percent)	80.80%		80.80%
Voting interest (as a percent)	97.50%		97.50%
ANGI Homeservices
Revenue and Other [Line Items]
Economic interest (as a percent)	83.70%		83.70%
Voting interest (as a percent)	98.10%		98.10%
Desktop reporting unit | Applications
Revenue and Other [Line Items]
Goodwill balance	$ 265,100		$ 265,100
Carrying value of related intangible asset	$ 28,900		$ 28,900

LEASES - Balance Sheet Informat

LEASES - Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets:
Right-of-use assets	$ 177,797	$ 0
Liabilities:
Current lease liabilities	33,029
Long-term lease liabilities	198,962
Total lease liabilities	$ 231,991

LEASES - Lease Cost (Details)

LEASES - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Fixed lease cost	$ 11,685	$ 35,992
Variable lease cost	2,300	7,021
Net lease cost	13,985	43,013
Short-term lease cost	1,100	4,200
Sublease income	600	1,600
Cost of revenue
Lessee, Lease, Description [Line Items]
Fixed lease cost	975	3,181
Variable lease cost	90	354
Selling and marketing expense
Lessee, Lease, Description [Line Items]
Fixed lease cost	2,836	7,747
Variable lease cost	337	1,007
General and administrative expense
Lessee, Lease, Description [Line Items]
Fixed lease cost	7,424	24,014
Variable lease cost	1,799	5,487
Product development expense
Lessee, Lease, Description [Line Items]
Fixed lease cost	450	1,050
Variable lease cost	$ 74	$ 173

LEASES - Operating Lease Liabil

LEASES - Operating Lease Liabilities Maturities (Details) $ in Thousands	Sep. 30, 2019USD ($)
Leases [Abstract]
Remainder of 2019	$ 9,565
2020	46,199
2021	40,761
2022	33,659
2023	28,836
After 2023	249,912
Total	408,932
Remainder of 2019	176,941
Present value of lease liabilities	231,991
Lease payments for leases signed but not yet commenced	$ 6,000

LEASES - Weighted-Average Remai

LEASES - Weighted-Average Remaining Term and Discount Rate (Details)	Sep. 30, 2019
Leases [Abstract]
Remaining lease term	15 years 2 months 12 days
Discount rate	6.02%

LEASES - Other Information (Det

LEASES - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Other Information:
Right-of-use assets obtained in exchange for lease liabilities	$ 6,699	$ 59,857
Cash paid for amounts included in the measurement of lease liabilities	$ 10,719	$ 34,433

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Benefit due to lower estimated annual effective income tax rate	$ 3,600
Income tax provision (benefit)	(14,823)	$ (18,242)	$ (62,142)	$ (15,887)
Reduction in the Transition Tax		$ 9,200
Unrecognized tax benefits, including interest and penalties	68,300		68,300		$ 52,300
Increase to unrecognized tax benefits, inclding interest, due principally to research credits			16,000
Unrecognized tax benefits, if subsequently recognized would reduce income tax expense	63,500		63,500		$ 49,100
Decrease in unrecognized tax benefit, reasonably possible within twelve months	24,500		24,500
Decrease in unrecognized tax benefit, reasonably possible within twelve months which would reduce the income tax provision	$ 24,300		$ 24,300

FINANCIAL INSTRUMENTS - Narrati

FINANCIAL INSTRUMENTS - Narrative (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Feb. 15, 2019USD ($)	Dec. 31, 2018USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized (loss) gain on marketable equity security	$ (4,600,000)			$ 25,300,000
Gross realized gains	0		$ 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	334,000,000			334,000,000			$ 235,100,000
Total upward adjustments to equity securities without readily determinable fair value	300,000			300,000
Total downward adjustments to equity securities without readily determinable fair value	3,000,000			3,000,000
Contingent Consideration Arrangements
Total maximum contingent payment	45,000,000			45,000,000
Gross fair value, before unamortized discount	22,300,000			22,300,000
Payment to settle contingent consideration arrangement		$ 2,000,000
Current portion	2,000,000			2,000,000			2,000,000
Non-current portion	11,700,000			11,700,000			26,600,000
Match Group
Contingent Consideration Arrangements
Aggregate principal amount	1,625,000,000			1,625,000,000			1,535,000,000
Match Group | Credit Facility | MTCH Credit Facility
Contingent Consideration Arrangements
Face amount of debt instrument							500,000,000
Aggregate principal amount	0			0			260,000,000
Match Group | Senior Notes | 5.625% MTCH Senior Notes
Contingent Consideration Arrangements
Aggregate principal amount	$ 350,000,000			$ 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 rate	0.25			0.25
Minimum | Measurement Input, Discount Rate | Contingent Consideration Arrangements
Contingent Consideration Arrangements
Contingent consideration, discount rate							0.12
Maximum | Measurement Input, Discount Rate | Contingent Consideration Arrangements
Contingent Consideration Arrangements
Contingent consideration, discount rate							0.25
Turo
Contingent Consideration Arrangements
Equity method investments	$ 250,000,000			$ 250,000,000

FINANCIAL INSTRUMENTS - Fair Va

FINANCIAL INSTRUMENTS - Fair Value of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Marketable equity securities	$ 157,174	$ 419
Available-for-sale marketable debt securities	0	123,246
Total marketable securities	$ 157,174	$ 123,665

FINANCIAL INSTRUMENTS - Current

FINANCIAL INSTRUMENTS - Current Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 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 - Proceed

FINANCIAL INSTRUMENTS - Proceeds from Maturities and Sales of Current Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Proceeds from maturities of available-for-sale marketable debt securities	$ 0	$ 115,000	$ 163,500	$ 125,000

FINANCIAL INSTRUMENTS - Realize

FINANCIAL INSTRUMENTS - Realized and Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Adjustments to Carrying Value of Non-Marketable Equity Securities
Upward adjustments (gross unrealized gains)	$ 53	$ 0	$ 53	$ 128,786
Downward adjustments including impairment (gross unrealized losses)	(543)	0	(1,193)	(2,588)
Total	(490)	0	(1,140)	126,198
Adjustments to Carrying Value of Non-Marketable Equity Securities
Realized (losses) gains, net, for equity securities sold	(8)	702	2,136	27,874
Unrealized (losses) gains, net, on equity securities held	(5,066)	(115)	24,181	126,444
Total (losses) gains recognized, net, in other income, net	$ (5,074)	$ 587	$ 26,317	$ 154,318

FINANCIAL INSTRUMENTS - Assets

FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets:
Marketable securities	$ 0	$ 123,246
Marketable equity security	157,174	419
Other non-current assets	120,069	134,924
Total assets	2,478,553	1,818,666
Liabilities:
Contingent consideration arrangement	(13,664)	(28,631)
Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total assets	975,332	881,234
Liabilities:
Contingent consideration arrangement	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Total assets	1,494,292	937,432
Liabilities:
Contingent consideration arrangement	0	0
Significant Unobservable Inputs (Level 3)
Assets:
Total assets	8,929	0
Liabilities:
Contingent consideration arrangement	(13,664)	(28,631)
Money market funds
Assets:
Cash equivalents	818,158	880,815
Money market funds | Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	818,158	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	1,349,257	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	1,349,257	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	145,035	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	145,035	90,036
Time deposits | Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0	0
Commercial paper
Assets:
Cash equivalents		162,417
Marketable securities		10,955
Commercial paper | Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents		0
Marketable securities		0
Commercial paper | Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents		162,417
Marketable securities		10,955
Commercial paper | Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents		0
Marketable securities		0
Marketable equity security
Assets:
Marketable equity security	157,174	419
Marketable equity security | Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Marketable equity security	157,174	419
Marketable equity security | Significant Other Observable Inputs (Level 2)
Assets:
Marketable equity security	0	0
Marketable equity security | Significant Unobservable Inputs (Level 3)
Assets:
Marketable equity security	0	$ 0
Warrant
Assets:
Other non-current assets	8,929
Warrant | Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Other non-current assets	0
Warrant | Significant Other Observable Inputs (Level 2)
Assets:
Other non-current assets	0
Warrant | Significant Unobservable Inputs (Level 3)
Assets:
Other non-current assets	$ 8,929

FINANCIAL INSTRUMENTS - Changes

FINANCIAL INSTRUMENTS - Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Contingent Consideration Arrangements
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Balance at beginning of period	$ 29,803	$ (1,910)	$ 28,631	$ (2,647)
Fair value adjustments	16,139	(55)	12,993	(265)
Included in other comprehensive loss	0	(15)	(14)	(16)
Fair value date of acquisition	0	0	0	0
Settlements			1,988	948
Balance at end of period	13,664	$ (1,980)	13,664	$ (1,980)
Warrant
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Balance at beginning of period	0		0
Fair value adjustments	(8,689)		(8,689)
Included in other comprehensive loss	0		0
Fair value date of acquisition	17,618		17,618
Settlements			0
Balance at end of period	$ 8,929		$ 8,929

FINANCIAL INSTRUMENTS - Carryin

FINANCIAL INSTRUMENTS - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 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	(3,111,882)	(2,245,548)
Unamortized original issue discount and debt issuance costs	417,800	88,900
Carrying Value
Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current portion of long-term debt	(13,750)	(13,750)
Long-term debt, net	(3,111,882)	(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	$ (3,934,574)	$ (2,460,204)

LONG-TERM DEBT - Summary (Detai

LONG-TERM DEBT - Summary (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Feb. 15, 2019	Dec. 31, 2018	Dec. 04, 2017	Jun. 01, 2016
Debt Instrument [Line Items]
Less: unamortized original issue discount	$ (368,976)
Less: current portion of ANGI Term Loan	13,750		$ 13,750
Less: unamortized debt issuance costs	48,830
Long-term debt, net	3,111,882		2,245,548
Match Group
Debt Instrument [Line Items]
Aggregate principal amount	1,625,000		1,535,000
Less: unamortized original issue discount	6,586		7,352
Less: unamortized debt issuance costs	15,786		11,737
Long-term debt, net	1,602,628		1,515,911
Match Group | Term Loan | MTCH Term Loan due November 16, 2022
Debt Instrument [Line Items]
Aggregate principal amount	425,000		425,000
Match Group | Credit Facility | MTCH Credit Facility due December 7, 2023
Debt Instrument [Line Items]
Aggregate principal amount	0		260,000
Match Group | Senior Notes | 6.375% MTCH Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 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]
Aggregate principal amount	$ 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]
Aggregate principal amount	$ 350,000	$ 350,000	0
Stated interest rate (as a percent)	5.625%	5.625%
ANGI Homeservices
Debt Instrument [Line Items]
Less: current portion of ANGI Term Loan	$ 13,750		13,750
Less: unamortized debt issuance costs	1,942		2,529
Long-term debt, net	235,246		244,971
ANGI Homeservices | Term Loan | ANGI Term Loan due November 5, 2023
Debt Instrument [Line Items]
Aggregate principal amount	250,938		261,250
IAC
Debt Instrument [Line Items]
Aggregate principal amount	1,667,500		551,989
Less: unamortized original issue discount	362,390		54,025
Less: unamortized debt issuance costs	31,102		13,298
Long-term debt, net	1,274,008		484,666
IAC | Senior Notes | 2022 Exchangeable Notes
Debt Instrument [Line Items]
Aggregate principal amount	517,500		517,500
Less: unamortized original issue discount	$ 44,259		54,025
Stated interest rate (as a percent)	0.875%
IAC | Senior Notes | 2026 Exchangeable Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 575,000		0
Less: unamortized original issue discount	$ 133,188
Stated interest rate (as a percent)	0.875%
IAC | Senior Notes | 2030 Exchangeable Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 575,000		0
Less: unamortized original issue discount	$ 184,943
Stated interest rate (as a percent)	2.00%
IAC | Senior Notes | 4.75% Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 0		$ 34,489
Stated interest rate (as a percent)	4.75%		4.75%

LONG-TERM DEBT - Narrative (Det

LONG-TERM DEBT - Narrative (Details)	Aug. 23, 2019USD ($)	May 21, 2019USD ($)	Dec. 31, 2018USD ($)	Nov. 05, 2018USD ($)	Oct. 02, 2017USD ($)	Sep. 30, 2019USD ($)	Nov. 05, 2023USD ($)	Nov. 05, 2022USD ($)	Dec. 31, 2018USD ($)	Nov. 05, 2021USD ($)	Jun. 03, 2019USD ($)	Feb. 15, 2019USD ($)	Dec. 04, 2017	Jun. 01, 2016
Debt Instrument [Line Items]
Outstanding balance of debt instrument						$ 3,543,438,000
Net unamortized discount (premium)						(368,976,000)
Cash And Cash Equivalents And Marketable Securities						2,300,000,000
IAC
Debt Instrument [Line Items]
Net unamortized discount (premium)			$ 54,025,000			362,390,000			$ 54,025,000
Debt redeemed			551,989,000			1,667,500,000			551,989,000
IAC Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Borrowings outstanding of credit facility			$ 0			$ 0			$ 0
Annual commitment fee on undrawn funds, basis points (as a percent)						0.20%			0.20%
Maximum borrowing capacity						$ 250,000,000
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			$ 6,586,000			$ 7,352,000
Debt redeemed			1,535,000,000			$ 1,625,000,000			$ 1,535,000,000
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
Match Group | MTCH Credit Facility due December 7, 2023 | Revolving Credit Facility
Debt Instrument [Line Items]
Annual commitment fee on undrawn funds, basis points (as a percent)						0.25%			0.25%
Match Group | MTCH Credit Facility due December 7, 2023 | Maximum | Revolving Credit Facility
Debt Instrument [Line Items]
Leverage ratio limiting ability to pay dividends, make distributions, or repurchase stock						2
ANGI Homeservices | ANGI Homeservices Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Borrowings outstanding of credit facility			0			$ 0			$ 0
Annual commitment fee on undrawn funds, basis points (as a percent)						0.25%			0.25%
Debt instrument term				5 years
Maximum borrowing capacity				$ 250,000,000
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
Senior Notes | 0.875% Exchangeable Notes due 2026 & 2.00% Exchangeable Notes due 2030 | IAC
Debt Instrument [Line Items]
Proceeds from issuance of debt after fees and expenses		$ 1,100,000,000
Net unamortized discount (premium)		$ (136,900,000)
Period of reported sale price of common stock (trading days)						5 days
Period of consecutive reported sale price of common stock (trading days)						5 days
Senior Notes | 2026 Exchangeable Notes | IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)						0.875%
Outstanding balance of debt instrument						$ 441,812,000
Effective interest rate (as a percent)						5.35%
Face amount of debt instrument						$ 575,000,000
Net unamortized discount (premium)						133,188,000
Debt redeemed			0			$ 575,000,000			$ 0
Senior Notes | 2030 Exchangeable Notes | IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)						2.00%
Outstanding balance of debt instrument						$ 390,057,000					$ 75,000,000
Effective interest rate (as a percent)						6.59%
Face amount of debt instrument						$ 575,000,000
Net unamortized discount (premium)						184,943,000
Debt redeemed			0			$ 575,000,000			0
Senior Notes | 2022 Exchangeable Notes | IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)						0.875%
Outstanding balance of debt instrument			463,475,000			$ 473,241,000			463,475,000
Effective interest rate (as a percent)						4.73%
Net unamortized discount (premium)			54,025,000			$ 44,259,000			54,025,000
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%
If-converted value in excess of principal						$ 223,700,000			105,000,000
Debt redeemed			$ 517,500,000			$ 517,500,000			$ 517,500,000
Senior Notes | 4.75% Senior Notes | IAC
Debt Instrument [Line Items]
Stated interest rate (as a percent)			4.75%			4.75%			4.75%
Debt redeemed			$ 34,489,000			$ 0			$ 34,489,000
Premium for debt redeemed	$ 500,000
Accrued interest paid	$ 300,000
Senior Notes | Match Group | 6.375% MTCH Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)						6.375%								6.375%
Debt redeemed			400,000,000			$ 400,000,000			400,000,000
Senior Notes | Match Group | 5.00% MTCH Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)						5.00%							5.00%
Debt redeemed			450,000,000			$ 450,000,000			450,000,000
Senior Notes | Match Group | 5.625% MTCH Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)						5.625%						5.625%
Debt redeemed			0			$ 350,000,000			0			$ 350,000,000
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
Exchange price on applicable trading day (as a percent)		130.00%
Redemption price (as a percent)		100.00%
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			$ 425,000,000
Basis spread on variable rate (as a percent)						4.66%			5.09%
Debt redeemed			425,000,000			$ 425,000,000			$ 425,000,000
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			$ 250,900,000			$ 261,300,000
Basis spread on variable rate (as a percent)						3.53%			4.00%
Debt redeemed			261,250,000			$ 250,938,000			$ 261,250,000
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
Credit Facility | Match Group | MTCH Credit Facility due December 7, 2023
Debt Instrument [Line Items]
Outstanding balance of debt instrument			$ 260,000,000						$ 260,000,000
Borrowings outstanding of credit facility						$ 0
Effective interest rate (as a percent)			4.00%						4.00%
Face amount of debt instrument			$ 500,000,000						$ 500,000,000
Debt redeemed			$ 260,000,000			$ 0			$ 260,000,000
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
Credit Facility | Match Group | MTCH Credit Facility due December 7, 2023 | Minimum
Debt Instrument [Line Items]
Minimum interest coverage ratio						2

LONG-TERM DEBT - Exchangeable N

LONG-TERM DEBT - Exchangeable Notes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 03, 2019	Dec. 31, 2018	Oct. 02, 2017
Liability component:
Less: unamortized original issue discount	$ (368,976,000)		$ (368,976,000)
Total	3,543,438,000		$ 3,543,438,000
Senior Notes | 2022 Exchangeable Notes
Debt Instrument [Line Items]
Approximate Equivalent Exchange Price per Share (USD per share)			$ 152.18
Senior Notes | 2026 Exchangeable Notes
Debt Instrument [Line Items]
Approximate Equivalent Exchange Price per Share (USD per share)			302.77
Senior Notes | 2030 Exchangeable Notes
Debt Instrument [Line Items]
Approximate Equivalent Exchange Price per Share (USD per share)			$ 291.35
IAC
Liability component:
Principal	1,667,500,000		$ 1,667,500,000			$ 551,989,000
Less: unamortized original issue discount	362,390,000		$ 362,390,000			54,025,000
IAC | Senior Notes
Liability component:
Total							$ 517,500,000
IAC | Senior Notes | 2022 Exchangeable Notes
Debt Instrument [Line Items]
Number of shares of the Company's Common Stock into which each $1,000 of Principal of the Exchangeable Notes is Exchangeable			6.5713
Approximate Equivalent Exchange Price per Share (USD per share)			$ 152.18
Liability component:
Principal	517,500,000		$ 517,500,000			517,500,000
Less: unamortized original issue discount	44,259,000		44,259,000			54,025,000
Total	473,241,000		473,241,000			463,475,000
Equity component	70,363,000		70,363,000			70,363,000
Interest expense recognized related to the Exchangeable Notes
Contractual interest expense	1,132,000	$ 1,138,000	3,396,000	$ 3,396,000
Amortization of original issue discount	3,006,000	3,299,000	9,765,000	9,802,000
Amortization of debt issuance costs	375,000	865,000	2,117,000	2,619,000
Total interest expense recognized	$ 4,513,000	$ 5,302,000	$ 15,278,000	$ 15,817,000
IAC | Senior Notes | 2022 Exchangeable Notes | Exchangeable Notes Hedge
Exchangeable Notes Hedges and Warrants
Number of Shares	3,400,000		3,400,000
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share)	$ 152.18		$ 152.18
IAC | Senior Notes | 2022 Exchangeable Notes | Exchangeable Notes Warrants
Exchangeable Notes Hedges and Warrants
Number of Shares	3,400,000		3,400,000
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share)	$ 229.70		$ 229.70
IAC | Senior Notes | 2026 Exchangeable Notes
Debt Instrument [Line Items]
Number of shares of the Company's Common Stock into which each $1,000 of Principal of the Exchangeable Notes is Exchangeable			3.3028
Approximate Equivalent Exchange Price per Share (USD per share)			$ 302.77
Liability component:
Principal	$ 575,000,000		$ 575,000,000			0
Less: unamortized original issue discount	133,188,000		133,188,000
Total	441,812,000		441,812,000
Equity component	138,796,000		138,796,000
Interest expense recognized related to the Exchangeable Notes
Contractual interest expense	1,258,000		1,705,000
Amortization of original issue discount	4,109,000		5,608,000
Amortization of debt issuance costs	294,000		425,000
Total interest expense recognized	$ 5,661,000		$ 7,738,000
IAC | Senior Notes | 2026 Exchangeable Notes | Exchangeable Notes Hedge
Exchangeable Notes Hedges and Warrants
Number of Shares	1,900,000		1,900,000
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share)	$ 302.77		$ 302.77
IAC | Senior Notes | 2026 Exchangeable Notes | Exchangeable Notes Warrants
Exchangeable Notes Hedges and Warrants
Number of Shares	1,900,000		1,900,000
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share)	$ 457.02		$ 457.02
IAC | Senior Notes | 2030 Exchangeable Notes
Debt Instrument [Line Items]
Number of shares of the Company's Common Stock into which each $1,000 of Principal of the Exchangeable Notes is Exchangeable			3.4323
Approximate Equivalent Exchange Price per Share (USD per share)			$ 291.35
Liability component:
Principal	$ 575,000,000		$ 575,000,000			$ 0
Less: unamortized original issue discount	184,943,000		184,943,000
Total	390,057,000		390,057,000		$ 75,000,000
Equity component	189,213,000		189,213,000
Interest expense recognized related to the Exchangeable Notes
Contractual interest expense	2,875,000		3,897,000
Amortization of original issue discount	3,124,000		4,270,000
Amortization of debt issuance costs	148,000		233,000
Total interest expense recognized	$ 6,147,000		$ 8,400,000
IAC | Senior Notes | 2030 Exchangeable Notes | Exchangeable Notes Hedge
Exchangeable Notes Hedges and Warrants
Number of Shares	2,000,000		2,000,000
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share)	$ 291.35		$ 291.35
IAC | Senior Notes | 2030 Exchangeable Notes | Exchangeable Notes Warrants
Exchangeable Notes Hedges and Warrants
Number of Shares	2,000,000		2,000,000
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share)	$ 457.02		$ 457.02

LONG-TERM DEBT - Maturities (De

LONG-TERM DEBT - Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Remainder of 2019	$ 3,438
2020	13,750
2021	13,750
2022	970,000
2023	192,500
After 2023	2,350,000
Total	3,543,438
Less: current portion of long-term debt	13,750	$ 13,750
Less: unamortized original issue discount	368,976
Less: unamortized debt issuance costs	(48,830)
Total long-term debt, net	$ 3,111,882	$ 2,245,548

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	$ 3,843,597,000	$ 3,236,948,000	$ 3,551,801,000	$ 2,946,823,000
Total other comprehensive loss, net of income taxes	(23,053,000)	(1,078,000)	(20,652,000)	(12,248,000)
Balance at end of period	3,805,761,000	3,328,592,000	3,805,761,000	3,328,592,000
Tax provision (benefit) on accumulated other comprehensive loss	0	0	0	0
Foreign Currency Translation Adjustment attributable to Parent
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(125,705,000)	(112,730,000)	(128,726,000)	(103,568,000)
Balance at end of period	(144,604,000)	(112,841,000)	(144,604,000)	(112,841,000)
Foreign Currency Translation Adjustment including portion attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss)
Other comprehensive loss	(18,389,000)	(502,000)	(16,299,000)	(9,550,000)
Amounts reclassified to earnings				(52,000)
Total other comprehensive loss, net of income taxes	(18,389,000)	(502,000)	(16,299,000)	(9,602,000)
Foreign Currency Translation Adjustment attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss)
Total other comprehensive loss, net of income taxes	(510,000)	391,000	421,000	329,000
Unrealized Gains on Available-for-Sale Debt Securities attributable to Parent
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period		13,000	4,000	0
Balance at end of period	0	(14,000)	0	(14,000)
Unrealized Gains on Available-for-Sale Debt Securities including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss)
Other comprehensive loss		(27,000)	(4,000)	(14,000)
Amounts reclassified to earnings				0
Total other comprehensive loss, net of income taxes		(27,000)	(4,000)	(14,000)
Unrealized Gains on Available-for-Sale Debt Securities attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss)
Total other comprehensive loss, net of income taxes		0	0	0
Accumulated Other Comprehensive (Loss) Income attributable to Parent
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(125,705,000)	(112,717,000)	(128,722,000)	(103,568,000)
Balance at end of period	(144,604,000)	(112,855,000)	(144,604,000)	(112,855,000)
Accumulated Other Comprehensive (Loss) Income including portion attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss)
Other comprehensive loss	(18,389,000)	(529,000)	(16,303,000)	(9,564,000)
Amounts reclassified to earnings				(52,000)
Total other comprehensive loss, net of income taxes	(18,389,000)	(529,000)	(16,303,000)	(9,616,000)
Accumulated Other Comprehensive (Loss) Income attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss)
Total other comprehensive loss, net of income taxes	$ (510,000)	$ 391,000	$ 421,000	$ 329,000

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator: Basic
Net earnings	$ 159,772	$ 171,577	$ 419,548	$ 540,270
Net earnings attributable to noncontrolling interests	(31,228)	(25,803)	(88,842)	(105,061)
Net earnings attributable to IAC shareholders	128,544	145,774	330,706	435,209
Numerator: Diluted
Net earnings	159,772	171,577	419,548	540,270
Net earnings attributable to noncontrolling interests	(31,228)	(25,803)	(88,842)	(105,061)
Impact from publicly-traded subsidiaries' dilutive securities	(7,342)	(8,336)	(20,174)	(19,490)
Net earnings attributable to IAC shareholders	$ 121,202	$ 137,438	$ 310,532	$ 415,719
Denominator: Basic
Weighted average basic shares outstanding (shares)	84,393	83,433	84,147	83,342
Denominator: Diluted
Weighted average basic shares outstanding (shares)	84,393	83,433	84,147	83,342
Dilutive securities (shares)	5,095	8,542	5,799	8,076
Denominator for earnings per share - weighted average shares (shares)	89,488	91,975	89,946	91,418
Earnings per share attributable to IAC shareholders: Basic
Earnings per share (USD per share)	$ 1.52	$ 1.75	$ 3.93	$ 5.22
Earnings per share attributable to IAC shareholders: Diluted
Earnings per share (USD per share)	1.35	1.49	3.45	4.55
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average share price (USD per share)	$ 238.90	$ 181.60	$ 223.32	$ 160.85
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)	7,700	3,400	11,200	3,400
Market-based awards and PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares)	300	200	300	200
Senior Notes | 2022 Exchangeable Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares)	1,200	600	1,100	200
Exchange price per share (USD per share)			$ 152.18
Senior Notes | 2026 Exchangeable Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exchange price per share (USD per share)			302.77
Senior Notes | 2030 Exchangeable Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exchange price per share (USD per share)			$ 291.35

SEGMENT INFORMATION - Financial

SEGMENT INFORMATION - Financial Data by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenue	$ 1,246,874	$ 1,104,592	$ 3,539,375	$ 3,158,789
Operating income (loss)	185,852	172,832	420,035	431,219
Operating segments | Match Group
Segment Reporting Information [Line Items]
Revenue	541,493	443,943	1,504,091	1,272,506
Operating income (loss)	176,604	139,895	468,330	402,293
Adjusted EBITDA	206,131	165,039	564,720	478,341
Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	357,358	303,116	1,004,697	853,249
Operating income (loss)	24,726	33,515	32,488	46,021
Adjusted EBITDA	58,923	77,700	147,534	181,319
Operating segments | Vimeo
Segment Reporting Information [Line Items]
Revenue	52,145	40,304	141,439	115,432
Operating income (loss)	(11,155)	(6,161)	(40,555)	(25,502)
Adjusted EBITDA	(7,997)	(4,229)	(33,661)	(19,644)
Operating segments | Dotdash
Segment Reporting Information [Line Items]
Revenue	40,285	30,053	111,974	90,841
Operating income (loss)	3,695	2,416	13,752	6,946
Adjusted EBITDA	7,026	3,071	22,551	8,914
Operating segments | Applications
Segment Reporting Information [Line Items]
Revenue	126,071	153,973	402,557	429,034
Operating income (loss)	39,099	33,041	85,422	91,579
Adjusted EBITDA	25,433	34,989	80,440	97,145
Operating segments | Emerging & Other
Segment Reporting Information [Line Items]
Revenue	129,581	133,345	374,871	398,026
Operating income (loss)	(1,821)	10,893	(6,130)	23,465
Adjusted EBITDA	(1,529)	12,235	(5,141)	28,733
Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenue	(59)	(142)	(254)	(299)
Corporate
Segment Reporting Information [Line Items]
Operating income (loss)	(45,296)	(40,767)	(133,272)	(113,583)
Adjusted EBITDA	$ (21,945)	$ (21,478)	$ (60,751)	$ (54,038)

SEGMENT INFORMATION - Revenue D

SEGMENT INFORMATION - Revenue Disaggregated by Service (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenue	$ 1,246,874	$ 1,104,592	$ 3,539,375	$ 3,158,789
Operating segments | Match Group
Segment Reporting Information [Line Items]
Revenue	541,493	443,943	1,504,091	1,272,506
Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	357,358	303,116	1,004,697	853,249
Operating segments | Vimeo
Segment Reporting Information [Line Items]
Revenue	52,145	40,304	141,439	115,432
Operating segments | Dotdash
Segment Reporting Information [Line Items]
Revenue	40,285	30,053	111,974	90,841
Operating segments | Applications
Segment Reporting Information [Line Items]
Revenue	126,071	153,973	402,557	429,034
Operating segments | Applications | Mosaic Group
Segment Reporting Information [Line Items]
Revenue	51,203	35,431	146,864	78,474
Operating segments | Emerging & Other
Segment Reporting Information [Line Items]
Revenue	129,581	133,345	374,871	398,026
North America | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	339,144	286,594	945,538	800,125
International
Segment Reporting Information [Line Items]
Revenue	439,686	365,993	1,245,711	1,054,039
Europe | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	18,214	16,522	59,159	53,124
Direct revenue | Operating segments | Match Group
Segment Reporting Information [Line Items]
Revenue	530,949	431,545	1,472,211	1,232,009
Direct revenue | North America | Operating segments | Match Group
Segment Reporting Information [Line Items]
Revenue	268,863	233,643	758,135	667,163
Direct revenue | International | Operating segments | Match Group
Segment Reporting Information [Line Items]
Revenue	262,086	197,902	714,076	564,846
Indirect revenue (principally advertising revenue) | Operating segments | Match Group
Segment Reporting Information [Line Items]
Revenue	10,544	12,398	31,880	40,497
Total Marketplace revenue | North America | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	270,516	213,049	749,969	583,392
Consumer connection revenue | North America | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	252,552	195,065	695,370	531,297
Membership subscription revenue | North America | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	16,237	17,034	49,239	49,226
Other revenue | North America | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	1,727	950	5,360	2,869
Advertising and other revenue | North America | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	68,628	73,545	195,569	216,733
Advertising and other revenue | Europe | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	624	283	1,859	834
Consumer connection revenue | Europe | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	14,125	12,022	46,480	38,885
Membership subscription revenue | Europe | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	3,465	4,217	10,820	13,405
Platform revenue | Operating segments | Vimeo
Segment Reporting Information [Line Items]
Revenue	52,145	37,245	139,160	106,470
Hardware revenue | Operating segments | Vimeo
Segment Reporting Information [Line Items]
Revenue	0	3,059	2,279	8,962
Advertising revenue | Operating segments | Dotdash
Segment Reporting Information [Line Items]
Revenue	29,158	23,949	84,171	71,714
Advertising revenue | Operating segments | Applications | Mosaic Group
Segment Reporting Information [Line Items]
Revenue	2,124	4,274	6,957	14,787
Advertising revenue | Operating segments | Emerging & Other
Segment Reporting Information [Line Items]
Revenue	113,564	105,873	330,438	317,047
Google advertising revenue | Operating segments | Emerging & Other
Segment Reporting Information [Line Items]
Revenue	101,609	84,955	303,207	266,061
Other advertising revenue | Operating segments | Emerging & Other
Segment Reporting Information [Line Items]
Revenue	11,955	20,918	27,231	50,986
Affiliate commerce commission and other revenue | Operating segments | Dotdash
Segment Reporting Information [Line Items]
Revenue	11,127	6,104	27,803	19,127
Total Desktop revenue | Operating segments | Applications
Segment Reporting Information [Line Items]
Revenue	74,868	118,542	255,693	350,560
Total advertising revenue | Operating segments | Applications
Segment Reporting Information [Line Items]
Revenue	71,255	114,271	243,584	334,205
Google advertising revenue | Operating segments | Applications
Segment Reporting Information [Line Items]
Revenue	68,076	110,855	234,211	326,982
Other advertising revenue | Operating segments | Applications
Segment Reporting Information [Line Items]
Revenue	3,179	3,416	9,373	7,223
Subscription and other revenue | Operating segments | Applications
Segment Reporting Information [Line Items]
Revenue	3,613	4,271	12,109	16,355
Subscription and other revenue | Operating segments | Applications | Mosaic Group
Segment Reporting Information [Line Items]
Revenue	49,079	31,157	139,907	63,687
Other revenue | Operating segments | Emerging & Other
Segment Reporting Information [Line Items]
Revenue	$ 16,017	$ 27,472	$ 44,433	$ 80,979

SEGMENT INFORMATION - Geographi

SEGMENT INFORMATION - Geographic Information about Revenue and Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Revenue and long-lived assets by geography
Revenue	$ 1,246,874	$ 1,104,592	$ 3,539,375	$ 3,158,789
Long-lived assets (excluding goodwill and intangible assets)	361,664		361,664		$ 318,800
United States
Revenue and long-lived assets by geography
Revenue	807,188	738,599	2,293,664	2,104,750
Long-lived assets (excluding goodwill and intangible assets)	336,055		336,055		289,756
All other countries
Revenue and long-lived assets by geography
Revenue	439,686	$ 365,993	1,245,711	$ 1,054,039
Long-lived assets (excluding goodwill and intangible assets)	$ 25,609		$ 25,609		$ 29,044

SEGMENT INFORMATION - Reconcili

SEGMENT INFORMATION - Reconciliation of Operating Income (Loss) to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating Income (Loss)	$ 185,852	$ 172,832	$ 420,035	$ 431,219
Stock-Based Compensation Expense	50,053	55,363	179,922	172,006
Depreciation	23,090	18,925	63,152	56,987
Amortization of Intangibles	23,186	20,152	65,576	60,293
Interest expense	(42,132)	(27,610)	(110,481)	(81,471)
Other income, net	1,229	8,113	47,852	174,635
Earnings before income taxes	144,949	153,335	357,406	524,383
Income tax benefit	14,823	18,242	62,142	15,887
Net earnings	159,772	171,577	419,548	540,270
Net earnings attributable to noncontrolling interests	(31,228)	(25,803)	(88,842)	(105,061)
Net earnings attributable to IAC shareholders	128,544	145,774	330,706	435,209
Operating segments | Match Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating Income (Loss)	176,604	139,895	468,330	402,293
Stock-Based Compensation Expense	20,805	16,141	70,817	49,810
Depreciation	8,081	8,513	24,109	25,059
Amortization of Intangibles	641	435	1,464	914
Acquisition-related Contingent Consideration Fair Value Adjustments	0	55	0	265
Adjusted EBITDA	206,131	165,039	564,720	478,341
Operating segments | ANGI Homeservices
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating Income (Loss)	24,726	33,515	32,488	46,021
Stock-Based Compensation Expense	8,784	22,474	45,586	69,433
Depreciation	11,244	6,100	27,039	18,170
Amortization of Intangibles	14,169	15,611	42,421	47,695
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0	0	0
Adjusted EBITDA	58,923	77,700	147,534	181,319
Operating segments | Vimeo
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating Income (Loss)	(11,155)	(6,161)	(40,555)	(25,502)
Stock-Based Compensation Expense	0	0	0	0
Depreciation	39	291	364	947
Amortization of Intangibles	3,119	1,641	6,530	4,911
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0	0	0
Adjusted EBITDA	(7,997)	(4,229)	(33,661)	(19,644)
Operating segments | Dotdash
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating Income (Loss)	3,695	2,416	13,752	6,946
Stock-Based Compensation Expense	0	0	0	0
Depreciation	216	246	660	741
Amortization of Intangibles	3,115	409	8,139	1,227
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0	0	0
Adjusted EBITDA	7,026	3,071	22,551	8,914
Operating segments | Applications
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating Income (Loss)	39,099	33,041	85,422	91,579
Stock-Based Compensation Expense	0	0	0	0
Depreciation	331	617	1,139	2,145
Amortization of Intangibles	2,142	1,331	6,872	3,421
Acquisition-related Contingent Consideration Fair Value Adjustments	(16,139)	0	(12,993)	0
Adjusted EBITDA	25,433	34,989	80,440	97,145
Operating segments | Emerging & Other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating Income (Loss)	(1,821)	10,893	(6,130)	23,465
Stock-Based Compensation Expense	0	323	0	1,747
Depreciation	292	294	839	1,396
Amortization of Intangibles	0	725	150	2,125
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0	0	0
Adjusted EBITDA	(1,529)	12,235	(5,141)	28,733
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating Income (Loss)	(45,296)	(40,767)	(133,272)	(113,583)
Stock-Based Compensation Expense	20,464	16,425	63,519	51,016
Depreciation	2,887	2,864	9,002	8,529
Amortization of Intangibles	0	0	0	0
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0	0	0
Adjusted EBITDA	$ (21,945)	$ (21,478)	$ (60,751)	$ (54,038)

CONSOLIDATED FINANCIAL STATEM_3

CONSOLIDATED FINANCIAL STATEMENT DETAILS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Variable Interest Entity [Line Items]
Interest income	$ 15,900	$ 8,100	$ 42,800	$ 20,200
Unrealized gain (loss)	(5,066)	(115)	24,181	126,444
Net foreign currency exchange gains		800		2,900
Realized loss			(8,200)
Mark-to-market charge			1,300
Realized gain	(8)	$ 702	2,136	27,874
Pinterest
Variable Interest Entity [Line Items]
Unrealized reduction to estimated fair value of warrant	8,700
Unrealized gain (loss)	$ 4,600		25,300	128,800
Realized gain				$ 26,800
Warrant
Variable Interest Entity [Line Items]
Unrealized gain (loss)			$ (8,700)

CONSOLIDATED FINANCIAL STATEM_4

CONSOLIDATED FINANCIAL STATEMENT DETAILS - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 2,946,180	$ 2,131,632	$ 1,670,984	$ 1,630,809
Restricted cash included in other current assets	1,570	1,633	344	2,873
Restricted cash included in other non-current assets	403	420	433	0
Total cash, cash equivalents and restricted cash as shown on the consolidated statement of cash flows	$ 2,948,153	$ 2,133,685	$ 1,671,761	$ 1,633,682

CONSOLIDATED FINANCIAL STATEM_5

CONSOLIDATED FINANCIAL STATEMENT DETAILS - Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other income, net	$ 1,229	$ 8,113	$ 47,852	$ 174,635

CONTINGENCIES (Details)

CONTINGENCIES (Details)	Jun. 13, 2019plaintiff	Aug. 31, 2018plaintiff	Aug. 14, 2018USD ($)plaintiff	Sep. 30, 2019USD ($)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	6	6	10
Number of plaintiffs who filed a notice of discontinuance of their claims without prejudice		4
Number of plaintiffs that were granted motion to dismiss merger-related claim for breach of contract	2
Tinder Optionholder Litigation | Pending Litigation
Loss Contingencies [Line Items]
Damages sought | $			$ 2,000,000,000

Uncategorized Items - iac-20199

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