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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2017	Apr. 28, 2017
Entity Registrant Name	IAC/INTERACTIVECORP
Entity Central Index Key	0000891103
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Amendment Flag	false
Common Stock
Entity Common Stock, Shares Outstanding		72,896,263
Class B Convertible Common Stock
Entity Common Stock, Shares Outstanding		5,789,499

CONSOLIDATED BALANCE SHEET (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 1,397,038	$ 1,329,187
Marketable securities	33,992	89,342
Accounts receivable, net of allowance of $17,118 and $16,405, respectively	218,504	220,138
Other current assets	236,788	204,068
Total current assets	1,886,322	1,842,735
Property and equipment, net of accumulated depreciation and amortization of $314,422 and $311,834, respectively	291,721	306,248
Goodwill	1,914,133	1,924,052
Intangible assets, net of accumulated amortization of $90,659 and $102,168, respectively	326,704	355,451
Long-term investments	119,525	122,810
Other non-current assets	80,922	94,577
TOTAL ASSETS	4,619,327	4,645,873
LIABILITIES:
Current portion of long-term debt	5,000	20,000
Accounts payable, trade	83,003	62,863
Deferred revenue	272,371	285,615
Accrued expenses and other current liabilities	319,021	344,910
Total current liabilities	679,395	713,388
Long-term debt, net of current portion	1,571,982	1,582,484
Income taxes payable	32,618	33,528
Deferred income taxes	242,737	228,798
Other long-term liabilities	48,607	44,178
Redeemable noncontrolling interests	25,259	32,827
Commitments and contingencies
SHAREHOLDERS' EQUITY:
Additional paid-in capital	11,905,529	11,921,559
Retained earnings	316,323	290,114
Accumulated other comprehensive loss	(147,345)	(166,123)
Treasury stock 194,163,429 and 193,444,655 shares, respectively	(10,226,721)	(10,176,600)
Total IAC shareholders' equity	1,848,059	1,869,222
Noncontrolling interests	170,670	141,448
Total shareholders' equity	2,018,729	2,010,670
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	4,619,327	4,645,873
Common Stock
SHAREHOLDERS' EQUITY:
Common stock	257	256
Class B Convertible Common Stock
SHAREHOLDERS' EQUITY:
Common stock	$ 16	$ 16

CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accounts receivable, allowance	$ 17,118	$ 16,405
Accumulated depreciation and amortization, property and equipment	314,422	311,834
Accumulated amortization, intangible assets	$ 90,659	$ 102,168
Treasury stock, shares (in shares)	194,163,429	193,444,655
Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized shares (in shares)	1,600,000,000	1,600,000,000
Common stock, issued shares (in shares)	256,609,771	255,672,125
Common stock, outstanding shares (in shares)	72,814,342	72,595,470
Class B Convertible Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized shares (in shares)	400,000,000	400,000,000
Common stock, issued shares (in shares)	16,157,499	16,157,499
Common stock, outstanding shares (in shares)	5,789,499	5,789,499

CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue	$ 760,833	$ 819,179
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	145,958	193,734
Selling and marketing expense	350,411	383,064
General and administrative expense	143,595	132,251
Product development expense	54,760	59,098
Depreciation	19,888	15,795
Amortization of intangibles	9,161	13,820
Total operating costs and expenses	723,773	797,762
Operating income	37,060	21,417
Interest expense	(24,792)	(27,860)
Other (expense) income, net	(7,714)	15,897
Earnings before income taxes	4,554	9,454
Income tax benefit (provision)	23,909	(1,520)
Net earnings	28,463	7,934
Net (earnings) loss attributable to noncontrolling interests	(2,254)	348
Net earnings attributable to IAC shareholders	$ 26,209	$ 8,282
Per share information attributable to IAC shareholders:
Basic earnings per share (in dollars per share)	$ 0.34	$ 0.10
Diluted earnings per share (in dollars per share)	$ 0.29	$ 0.09
Stock-based compensation expense by function:
Stock-based compensation expense	$ 33,975	$ 31,185
Cost of revenue
Stock-based compensation expense by function:
Stock-based compensation expense	502	613
Selling and marketing expense
Stock-based compensation expense by function:
Stock-based compensation expense	1,807	1,871
General and administrative expense
Stock-based compensation expense by function:
Stock-based compensation expense	26,940	21,193
Product development expense
Stock-based compensation expense by function:
Stock-based compensation expense	$ 4,726	$ 7,508

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

3 Months Ended

Mar. 31, 2017

Mar. 31, 2016

Statement of Comprehensive Income [Abstract]

Net earnings

$ 28,463

$ 7,934

Other comprehensive income, net of tax:

Change in foreign currency translation adjustment

^[1]

21,910

15,745

Change in unrealized gains and losses of available-for-sale securities (net of tax benefits)

5,437

Total other comprehensive income, net of tax

21,912

21,182

Comprehensive income

50,375

29,116

Comprehensive income attributable to noncontrolling interests

(5,388)

(826)

Comprehensive income attributable to IAC shareholders

$ 44,987

$ 28,290

[1]	The three months ended March 31, 2017 and 2016 include amounts reclassified out of other comprehensive income into earnings. See Note 6—Accumulated Other Comprehensive Loss for additional information.

CONSOLIDATED STATEMENT OF COMPREHENSIVE OPERATIONS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Tax benefit of change in unrealized gains and losses of available-for-sale securities		$ 301

CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Unaudited) - 3 months ended Mar. 31, 2017 - USD ($) shares in Thousands, $ in Thousands	Total	Redeemable Noncontrolling Interests	IAC	Common Stock Common Stock	Common Stock Class B Convertible Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock	Noncontrolling Interests
Beginning balance at Dec. 31, 2016	$ 2,010,670		$ 1,869,222	$ 256	$ 16	$ 11,921,559	$ 290,114	$ (166,123)	$ (10,176,600)	$ 141,448
Beginning balance, common stock (in shares) at Dec. 31, 2016				255,672	16,157
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings	29,710		26,209				26,209			3,501
Other comprehensive (loss) income, net of tax	22,064		18,778					18,778		3,286
Stock-based compensation expense	28,830		13,532			13,532				15,298
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	(25,304)		(25,304)	$ 1		(25,305)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (in shares)				938
Purchase of treasury stock	(50,121)		(50,121)						(50,121)
Purchase of noncontrolling interests	(418)									(418)
Adjustment of redeemable noncontrolling interests to fair value	(3,606)		(3,606)			(3,606)
Issuance of Match Group common stock pursuant to stock-based awards, net of withholding taxes	6,657									6,657
Changes in noncontrolling interests of Match Group due to the issuance of its common stock			(751)			(751)				751
Other	247		100			100				147
Ending balance at Mar. 31, 2017	2,018,729		$ 1,848,059	$ 257	$ 16	$ 11,905,529	$ 316,323	$ (147,345)	$ (10,226,721)	$ 170,670
Ending balance, common stock (in shares) at Mar. 31, 2017				256,610	16,157
Beginning balance at Dec. 31, 2016	32,827	$ 32,827
Increase (Decrease) in Redeemable Noncontrolling Interests
Net (loss) earnings		(1,247)
Other comprehensive (loss) income, net of tax		(152)
Stock-based compensation expense		690
Purchase of redeemable noncontrolling interests		(11,841)
Adjustment of redeemable noncontrolling interests to fair value		3,618
Other		1,364
Ending balance at Mar. 31, 2017	$ 25,259	$ 25,259

CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net earnings	$ 28,463	$ 7,934
Adjustments to reconcile net earnings to net cash provided by operating activities:
Stock-based compensation expense	33,975	31,185
Depreciation	19,888	15,795
Amortization of intangibles	9,161	13,820
Deferred income taxes	3,717	2,430
Equity in (earnings) losses of unconsolidated affiliates	(123)	404
Acquisition-related contingent consideration fair value adjustments	1,892	3,669
Gains on the sales of businesses, investments and assets, net	763	(14,700)
Impairment of long-term investments	3,373	2,302
Other adjustments, net	(819)	4,091
Changes in assets and liabilities, net of effects of acquisitions and dispositions:
Accounts receivable	(13,924)	7,792
Other assets	(15,878)	(6,626)
Accounts payable and other current liabilities	26,012	(10,796)
Income taxes payable and receivable	(38,610)	(37,477)
Deferred revenue	9,915	19,538
Net cash provided by operating activities	67,805	39,361
Cash flows from investing activities:
Acquisitions, net of cash acquired	(52,365)	(2,252)
Capital expenditures	(11,157)	(16,090)
Investments in time deposits	0	(87,500)
Proceeds from maturities and sales of marketable debt securities	75,350	0
Purchases of marketable debt securities	(19,926)	(66,891)
Purchases of investments	(29)	(813)
Net proceeds from the sale of businesses and investments	97,496	93,097
Other, net	213	4,380
Net cash provided by (used in) investing activities	89,582	(76,069)
Cash flows from financing activities:
Purchase of treasury stock	(56,424)	(135,938)
Principal payment on Match Group Term Loan	0	(10,000)
Repurchases of Senior Notes	(26,590)	(32,912)
Issuance of IAC common stock pursuant to stock-based awards, net of withholding taxes	(25,327)	(14,919)
Issuance of Match Group common stock pursuant to stock-based awards, net of withholding taxes	5,030	(4,453)
Purchase of noncontrolling interests	(12,259)	(1,400)
Acquisition-related contingent consideration payments	(3,860)	(312)
Funds returned from escrow for MyHammer tender offer	10,604	0
Other, net	15,288	(5,856)
Net cash used in financing activities	(93,538)	(205,790)
Total cash provided by (used in)	63,849	(242,498)
Effect of exchange rate changes on cash and cash equivalents	4,002	(285)
Net increase (decrease) in cash and cash equivalents	67,851	(242,783)
Cash and cash equivalents at beginning of period	1,329,187	1,481,447
Cash and cash equivalents at end of period	$ 1,397,038	$ 1,238,664

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2017
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 is a leading media and Internet company comprised of widely known consumer brands, such as HomeAdvisor, Vimeo, Dotdash (formerly About.com), Dictionary.com, The Daily Beast, Investopedia, and Match Group's online dating portfolio, which includes Match, Tinder, PlentyOfFish and OkCupid. All references to "IAC," the "Company," "we," "our" or "us" in this report are to IAC/InterActiveCorp. On March 31, 2017, Match Group sold its non-dating business, consisting of The Princeton Review. The non-dating business does not meet the threshold to be reflected as a discontinued operation at the IAC level. The Company has moved the non-dating business to its “Other” segment as of and for the quarter ended March 31, 2017 and prior period segment data has been recast to conform to the current period presentation. Basis of Presentation The Company prepares its consolidated financial statements in accordance with U.S. generally accepted accounting principles ("GAAP"). Basis of Consolidation and Accounting for Investments The consolidated financial statements include the accounts of the Company, all entities that are wholly-owned by the Company and all entities in which the Company has a controlling financial interest. Intercompany transactions and accounts have been eliminated. Investments in the common stock or in-substance common stock of entities in which the Company has the ability to exercise significant influence over the operating and financial matters of the investee, but does not have a controlling financial interest, are accounted for using the equity method and are included in "Long-term investments" in the accompanying consolidated balance sheet. The accompanying unaudited consolidated financial statements have been prepared in accordance with GAAP for interim financial information and with the rules and regulations of the Securities and Exchange Commission. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, the accompanying unaudited consolidated financial statements include all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation. Interim results are not necessarily indicative of the results that may be expected for the full year. The accompanying unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016. 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 marketable securities and other investments; the recoverability of goodwill and indefinite-lived intangible assets; the useful lives and recoverability of definite-lived intangible assets and property and equipment; the carrying value of accounts receivable, including the determination of the allowance for doubtful accounts; the determination of revenue reserves; the fair value of acquisition-related contingent consideration arrangements; the liabilities for uncertain tax positions; the valuation allowance for deferred income tax assets; and the fair value of and forfeiture rates for stock-based awards, among others. The Company bases its estimates and judgments on historical experience, its forecasts and budgets and other factors that the Company considers relevant. Certain Risks and Concentrations A significant portion of the Company's revenue is derived from online advertising, the market for which is highly competitive and rapidly changing. Significant changes in this industry or changes in advertising spending behavior or in customer buying behavior could adversely affect our operating results. Most of the Company's online advertising revenue is attributable to a services agreement with Google Inc. ("Google"). For the three months ended March 31, 2017 and 2016, revenue from Google represents 25% and 35%, respectively, of the Company's consolidated revenue. The Company's services agreement became effective on April 1, 2016, following the expiration of the previous services agreement. The services agreement expires on March 31, 2020; however, the Company may choose to terminate the agreement effective March 31, 2019. The services agreement requires that we comply with certain guidelines promulgated by Google. Google may generally unilaterally update its policies and guidelines without advance notice, which could in turn require modifications to, or prohibit and/or render obsolete certain of our products, services and/or business practices, which could be costly to address or otherwise have an adverse effect on our business, financial condition and results of operations. For the three months ended March 31, 2017 and 2016, revenue earned from Google was $187.8 million and $284.6 million, respectively. This revenue is earned by the businesses comprising the Applications and Publishing segments. For the three months ended March 31, 2017 and 2016, revenue earned from Google represents 84% and 70%; and 91% and 83%, of Applications and Publishing revenue, respectively. Accounts receivable related to revenue earned from Google totaled $65.5 million and $65.8 million at March 31, 2017 and December 31, 2016, respectively. Recent Accounting Pronouncements Accounting Pronouncements not yet adopted by the Company In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers, which clarifies the principles for recognizing revenue and develops a common standard for all industries. ASU 2014-09 was subsequently amended during 2015 and 2016; these amendments provide further revenue recognition guidance related to principal versus agent considerations, performance obligations and licensing, and narrow-scope improvements and practical expedients. ASU No. 2014-09 is a comprehensive revenue recognition standard that will supersede nearly all existing revenue recognition guidance under GAAP. The new standard provides a single principles-based, five-step model to be applied to all contracts with customers. This five-step model includes (1) identifying the contract(s) with the customer, (2) identifying the performance obligations in the contract, (3) determining the transaction price, (4) allocating the transaction price to the performance obligations in the contract and (5) recognizing revenue when each performance obligation is satisfied. More specifically, revenue will be recognized when promised goods or services are transferred to the customer in an amount that reflects the consideration expected in exchange for those goods or services. ASU No. 2014-09 is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted for interim and annual reporting periods beginning after December 15, 2016. Upon adoption, ASU No. 2014-09 may either be applied retrospectively to each prior period presented or using the modified retrospective approach with the cumulative effect recognized as of the date of initial application. While the Company’s evaluation of the impact the adoption of ASU No. 2014-09 on its consolidated financial statements continues, it has progressed to the point where we have reached certain preliminary determinations. The Company does not expect the adoption of ASU No. 2014-09 to have a material effect on its consolidated financial statements. The Company will adopt ASU No. 2014-09 using the modified retrospective approach effective January 1, 2018. Therefore, the cumulative effect of adoption will be reflected as an adjustment to beginning retained earnings in the Form 10-Q for the period ending March 31, 2018. The adoption of ASU No. 2014-09 will primarily affect the Company’s HomeAdvisor and Applications segments. The effect on HomeAdvisor will be that sales commissions, which represent the incremental direct costs of obtaining a service professional contract, will be capitalized and amortized over the average life of a service professional. These costs are expensed as incurred today. Within Applications, the primary effect will be to accelerate the recognition of the portion of the revenue of certain desktop applications sold by SlimWare that qualify as functional intellectual property under ASU No. 2014-09. This revenue is currently deferred and recognized over the applicable subscription term. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which supersedes existing guidance on accounting for leases in "Leases (Topic 840)" and generally requires all leases to be recognized in the statement of financial position. The provisions of ASU No. 2016-02 are effective for reporting periods beginning after December 15, 2018; early adoption is permitted. The provisions of ASU No. 2016-02 are to be applied using a modified retrospective approach. The Company is currently evaluating the impact the adoption of this standard update will have on its consolidated financial statements. Accounting Pronouncements adopted by the Company In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which clarifies how cash receipts and cash payments in certain transactions are presented and classified on the statement of cash flows. The provisions of ASU No. 2016-15 are effective for reporting periods beginning after December 15, 2017, including interim periods, and will require adoption on a retrospective basis unless it is impracticable to apply, in which case we would be required to apply the amendments prospectively as of the earliest date practicable; early adoption is permitted. Upon adoption, cash payments not made soon after the acquisition date of a business combination to settle a contingent consideration liability are separated and classified as cash outflows for operating activities and financing activities. Cash payments up to the amount of the contingent consideration liability recognized at the acquisition date (including measurement-period adjustments) are classified as financing activities; any excess is classified as operating activities. Cash payments made soon after the acquisition date of a business combination by an acquirer to settle a contingent consideration liability are classified as cash outflows for investing activities. The Company early adopted the provisions of ASU No. 2016-15 on January 1, 2017. As a result of the adoption of ASU No. 2016-15, $11.1 million of acquisition-related contingent consideration payments for the three months ended March 31, 2017 was in excess of the liability recognized at the acquisition date and, therefore, has been classified as a cash outflow in "Other adjustments, net" within net cash provided by operating activities in the accompanying consolidated statement of cash flows. In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The Company adopted the provisions of ASU No. 2016-09 on January 1, 2017. Excess tax benefits or deficiencies related to equity awards to employees upon exercise of stock options and the vesting of restricted stock units after January 1, 2017 are (i) reflected in the consolidated statement of operations as a component of the provision for income taxes, rather than recognized in equity, and (ii) reflected as operating, rather than financing, cash flows in our consolidated statement of cash flows. Excess tax benefits for the three months ended March 31, 2017 were $26.8 million. Excess tax benefits of $15.3 million for the three months ended March 31, 2016 were reclassified in the consolidated statement of cash flows to conform to the current year presentation. Upon adoption, the calculation of fully diluted shares excludes excess tax benefits from the assumed proceeds in applying the treasury stock method, they previously were included in the calculation; this change increased fully diluted shares by approximately 1.3 million shares for the three months ended March 31, 2017. The Company continues to account for forfeitures using an estimated forfeiture rate. In January 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, which is intended to simplify the accounting for goodwill impairment. The guidance eliminates the requirement to calculate the implied fair value of goodwill under today’s two-step impairment test to measure a goodwill impairment charge. The provisions of ASU No. 2017-04 are effective for reporting periods beginning after December 15, 2019; early adoption is permitted. The provisions of ASU No. 2017-04 are to be applied using a prospective approach. The Company early adopted the provisions of ASU No. 2017-04 on January 1, 2017 and the adoption of this standard update did not have a material impact on its consolidated financial statements. Reclassifications Certain prior year amounts have been reclassified to conform to the current year presentation.

INCOME TAXES	3 Months Ended
INCOME TAXES	Mar. 31, 2017
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES At the end of each interim period, the Company makes its best estimate of the annual expected effective income tax rate and applies that rate to its ordinary year-to-date earnings or loss. The income tax provision or benefit related to significant, unusual, or extraordinary items, if applicable, that will be separately reported or reported net of their related tax effects are individually computed and recognized in the interim period in which they occur. In addition, the effect of changes in enacted tax laws or rates, tax status, judgment on the realizability of a beginning-of-the-year deferred tax asset in future years or the liabilities for uncertain tax positions is recognized in the interim period in which the change occurs. The computation of the annual expected effective income tax rate at each interim period requires certain estimates and assumptions including, but not limited to, the expected pre-tax income (or loss) for the year, projections of the proportion of income (and/or loss) earned and taxed in foreign jurisdictions, permanent and temporary differences, and the likelihood of the realization of deferred tax assets generated in the current year. The accounting estimates used to compute the provision or benefit for income taxes may change as new events occur, more experience is acquired, additional information is obtained or our tax environment changes. To the extent that the expected annual effective income tax rate changes during a quarter, the effect of the change on prior quarters is included in income tax provision in the quarter in which the change occurs. For the three months ended March 31, 2017, the Company recorded an income tax benefit of $23.9 million. The income tax benefit for the three months ended March 31, 2017 is due primarily to the effect of adopting the provisions of ASU No. 2016-09 on January 1, 2017. Under ASU No. 2016-09, excess tax benefits generated by the settlement or exercise of stock-based awards of $26.8 million are recognized as a reduction to the income tax provision rather than additional paid-in capital. For the three months ended March 31, 2016, the Company recorded an income tax provision of $1.5 million which represents an effective income tax rate of 16%. The effective tax rate for the three months ended March 31, 2016 is lower than the statutory rate of 35% due primarily to the non-taxable gain on the sale of PriceRunner, partially offset by the non-deductible loss on contingent consideration fair value adjustments and the unbenefited loss associated with the other-than-temporary impairment charges related to certain of the Company's cost method investments. The Company recognizes interest and, if applicable, penalties related to unrecognized tax benefits in the income tax provision. At March 31, 2017 and December 31, 2016, the Company has accrued $2.7 million and $2.6 million, respectively, for the payment of interest. At March 31, 2017 and December 31, 2016, the Company has accrued $1.6 million and $1.7 million, respectively, for penalties. The Company is routinely under audit by federal, state, local and foreign authorities in the area of income tax. These audits include questioning the timing and the amount of income and deductions and the allocation of income and deductions among various tax jurisdictions. The Internal Revenue Service is currently auditing the Company’s federal income tax returns for the years ended December 31, 2010 through 2012. The statute of limitations for the years 2010 through 2012 has been extended to December 31, 2017. Various other jurisdictions are open to examination for tax years beginning with 2009. Income taxes payable include reserves considered sufficient to pay assessments that may result from examination of prior year tax returns. Changes to reserves from period to period and differences between amounts paid, if any, upon resolution of audits and amounts previously provided may be material. Differences between the reserves for income tax contingencies and the amounts owed by the Company are recorded in the period they become known. At March 31, 2017 and December 31, 2016, unrecognized tax benefits, including interest and penalties, are $40.1 million and $41.0 million, respectively. If unrecognized tax benefits at March 31, 2017 are subsequently recognized, $36.9 million, net of related deferred tax assets and interest, would reduce income tax expense. The comparable amount as of December 31, 2016 was $37.7 million. The Company believes that it is reasonably possible that its unrecognized tax benefits could decrease by $11.8 million by March 31, 2018, due to expirations of statutes of limitations and settlements; $11.1 million of which would reduce the income tax provision.

MARKETABLE SECURITIES

3 Months Ended

Mar. 31, 2017

Marketable Securities [Abstract]

MARKETABLE SECURITIES

At March 31, 2017, available-for-sale marketable securities are as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Commercial paper	$	21,949	$	—	$	—		$	21,949
Treasury discount notes	9,995		—		(2		)	9,993
Corporate debt securities	2,053		—		(3		)	2,050
Total debt securities	33,997		—		(5		)	33,992
Total marketable securities	$	33,997	$	—	$	(5	)	$	33,992

The contractual maturities of debt securities classified as available-for-sale at March 31, 2017 are due within one year.

The aggregate fair value of available-for-sale marketable debt securities in an unrealized loss position is $12.0 million as of March 31, 2017. There are no investments in available-for-sale marketable debt securities that have been in a continuous unrealized loss position for longer than twelve months as of March 31, 2017. The gross unrealized losses on the marketable debt securities relate primarily to changes in interest rates. The Company does not consider the gross unrealized losses to be other-than-temporary because the Company does not intend to sell the marketable debt securities that generated the gross unrealized losses at March 31, 2017, and it is not more likely than not that the Company will be required to sell these securities before recovery of their amortized costs bases, which may be maturity.

At December 31, 2016, available-for-sale marketable securities are as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Commercial paper	$	49,797	$	—	$	—		$	49,797
Treasury discount notes	34,978		—		(4		)	34,974
Corporate debt securities	4,575		2		(6		)	4,571
Total debt securities	89,350		2		(10		)	89,342
Total marketable securities	$	89,350	$	2	$	(10	)	$	89,342

The unrealized gains and losses in the tables above are included in "Accumulated other comprehensive loss" in the accompanying consolidated balance sheet.

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



	Three Months Ended March 31,
	2017		2016
	(In thousands)
Proceeds from maturities and sales of available-for-sale marketable securities	$	75,350	$	10,000

There were no gross realized gains or losses from the maturities and sales of available-for-sale marketable securities for the three months ended March 31, 2017 and 2016.

The specific-identification method is used to determine the cost of securities sold and the amount of unrealized gains and losses reclassified out of accumulated other comprehensive income (loss) into earnings.

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References + Details

FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS

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 prices for identical assets and liabilities in active markets.

•

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


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

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



	March 31, 2017
	Quoted Market Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value Measurements
	(In thousands)
Assets:
Cash equivalents:
Money market funds	$	689,129	$	—	$	—		$	689,129
Commercial paper	—		149,940		—			149,940
Time deposits	—		105,397		—			105,397
Treasury discount notes	74,971		—		—			74,971
Marketable securities:
Commercial paper	—		21,949		—			21,949
Treasury discount notes	9,993		—		—			9,993
Corporate debt securities	—		2,050		—			2,050
Total	$	774,093	$	279,336	$	—		1,053,429

Liabilities:
Contingent consideration arrangements	$	—	$	—	$	(21,821	)	$	(21,821	)



	December 31, 2016
	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	$	667,662	$	—	$	—		$	667,662
Commercial paper	—		123,640		—			123,640
Time deposits	—		79,000		—			79,000
Treasury discount notes	24,991		—		—			24,991
Marketable securities:
Commercial paper	—		49,797		—			49,797
Treasury discount notes	34,974		—		—			34,974
Corporate debt securities	—		4,571		—			4,571
Total	$	727,627	$	257,008	$	—		$	984,635

Liabilities:
Contingent consideration arrangements	$	—	$	—	$	(33,871	)	$	(33,871	)

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 March 31,
	2017			2016
	Contingent Consideration Arrangements			Auction Rate Security			Contingent Consideration Arrangements
	(In thousands)
Balance at January 1	$	(33,871	)	$	4,050		$	(33,873	)
Total net (losses) gains:
Included in earnings:
Fair value adjustments	(1,891		)	—			(3,669		)
Included in other comprehensive (loss) income	(1,059		)	5,950			(1,906		)
Fair value at date of acquisition	—			—			(185		)
Settlements	15,000			—			312
Proceeds from sale	—			(10,000		)	—
Other	—			—			2,078
Balance at March 31	$	(21,821	)	$	—		$	(37,243	)

Contingent Consideration Arrangements

As of March 31, 2017, there are five contingent consideration arrangements related to business acquisitions. The maximum contingent payments related to these five arrangements are $121.1 million and the fair value of these arrangements at March 31, 2017 is $21.8 million.

The contingent consideration arrangements are generally based upon earnings performance and/or operating metrics. The Company 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 arrangement is long-term in nature, applying a discount rate that appropriately captures the risks associated with the obligation to determine the net amount reflected in the consolidated financial statements. The number of scenarios in the probability-weighted analyses can vary; generally, more scenarios are prepared for longer duration and more complex arrangements. The fair values of the contingent consideration arrangements at both March 31, 2017 and December 31, 2016 reflect discount rates of 12%.

The fair values of the contingent consideration arrangements are sensitive to changes in the forecasts of earnings and/or the relevant operating metrics and changes in discount rates. The Company remeasures the fair value of the contingent consideration arrangements each reporting period, including the accretion of the discount, if applicable, and changes are recognized in “General and administrative expense” in the accompanying consolidated statement of operations. The contingent consideration arrangement liability at March 31, 2017 and December 31, 2016 includes a current portion of $21.4 million and $33.4 million, respectively, and non-current portion of $0.5 million and $0.4 million, respectively, which 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, as well as equity and cost method investments, are adjusted to fair value only when an impairment charge is recognized. Such fair value measurements are based predominantly on Level 3 inputs.

Cost method investments

At March 31, 2017 and December 31, 2016, the carrying values of the Company's investments accounted for under the cost method totaled $112.7 million and $116.1 million, respectively, and are included in "Long-term investments" in the accompanying consolidated balance sheet. The Company evaluates each cost method investment for impairment on a quarterly basis and recognizes an impairment loss if a decline in value is determined to be other-than-temporary. If the Company has not identified events or changes in circumstances that may have a significant adverse effect on the fair value of a cost method investment, then the fair value of such cost method investment is not estimated, as it is impracticable to do so.

Financial instruments measured at fair value only for disclosure purposes

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



	March 31, 2017						December 31, 2016
	Carrying Value			Fair Value			Carrying Value			Fair Value
	(In thousands)
Current portion of long-term debt	$	(5,000	)	$	(5,264	)	$	(20,000	)	$	(20,311	)
Long-term debt, net of current portion	(1,571,982		)	(1,655,064		)	(1,582,484		)	(1,657,861		)

The fair value of long-term debt, including the current portion, is estimated using market prices or indices for similar liabilities and takes into consideration other factors such as credit quality and maturity, which are Level 3 inputs.

- Definition

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

+ References + Details

LONG-TERM DEBT

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

LONG-TERM DEBT

Long-term debt consists of:



	March 31, 2017		December 31, 2016
	(In thousands)
Match Group Debt:
6.75% Senior Notes due December 15, 2022 (the "2015 Match Group Senior Notes"); interest payable each June 15 and December 15, which commenced June 15, 2016	$	445,172	$	445,172
6.375% Senior Notes due June 1, 2024 (the "2016 Match Group Senior Notes"); interest payable each June 1 and December 1, which commenced December 1, 2016	400,000		400,000
Match Group Term Loan due November 16, 2022 ^(a)	350,000		350,000
Total Match Group long-term debt	1,195,172		1,195,172
Less: Unamortized original issue discount and original issue premium, net	5,023		5,245
Less: Unamortized debt issuance costs	12,908		13,434
Total Match Group debt	1,177,241		1,176,493

IAC Debt:
4.875% Senior Notes due November 30, 2018 (the "2013 Senior Notes"); interest payable each May 30 and November 30, which commenced May 30, 2014	366,874		390,214
4.75% Senior Notes due December 15, 2022 (the "2012 Senior Notes"); interest payable each June 15 and December 15, which commenced June 15, 2013	34,859		38,109
Total IAC long-term debt	401,733		428,323
Less: Current portion of IAC long-term debt	5,000		20,000
Less: Unamortized debt issuance costs	1,992		2,332
Total IAC debt, net of current portion	$	394,741	$	405,991

Total long-term debt, net of current portion	$	1,571,982	$	1,582,484

________________________


^(a)	The Match Group Term Loan matures on November 16, 2022; provided that, if any of the 2015 Match Group Senior Notes remain outstanding on the date that is 91 days prior to the maturity date of the 2015 Match Group Senior Notes, the Match Group Term Loan maturity date shall be the date that is 91 days prior to the maturity date of the 2015 Match Group Senior Notes.

Match Group Senior Notes:

The 2016 Match Group Senior Notes were issued on June 1, 2016. The proceeds of $400 million were used to prepay a portion of indebtedness outstanding under the Match Group Term Loan. At any time prior to June 1, 2019, these notes may be redeemed at a redemption price equal to the sum of the principal amount thereof, plus accrued and unpaid interest and a make-whole premium. 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 2015 Match Group Senior Notes were issued on November 16, 2015, in exchange for a portion of the IAC 2012 Senior Notes (the "Match Exchange Offer"). At any time prior to December 15, 2017, the 2015 Match Group 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. 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 2016 and 2015 Match Group Senior Notes contain covenants that would limit Match Group's ability to pay dividends or to make distributions and repurchase or redeem Match Group stock in the event a default has occurred or Match Group's leverage ratio (as defined in the indentures) exceeds 5.0 to 1.0. At March 31, 2017 there were no limitations pursuant thereto. There are additional covenants that limit Match Group's ability and the ability of its subsidiaries to, among other things, (i) incur indebtedness, make investments, or sell assets in the event Match Group is not in compliance with the leverage ratio set forth in the indenture, and (ii) incur liens, enter into agreements restricting Match Group subsidiaries' ability to pay dividends, enter into transactions with affiliates and consolidate, merge or sell substantially all of their assets.

Match Group Term Loan and Match Group Credit Facility:

On November 16, 2015, under a credit agreement (the "Match Group Credit Agreement"), Match Group borrowed $800 million in the form of a term loan (the "Match Group Term Loan"). On March 31, 2016, Match Group made a $10 million principal payment on the Match Group Term Loan. On June 1, 2016, the $400 million in proceeds from the 2016 Match Group Senior Notes, described above, were used to prepay a portion of the Match Group Term Loan. On December 8, 2016, Match Group made an additional $40 million principal payment on the Match Group Term Loan and the remaining outstanding balance of $350 million, which is due at maturity, was repriced. The Match Group Term Loan provides for additional 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 Match Group Credit Agreement. The Match Group Term Loan bears interest, at Match Group's option, at a base rate or LIBOR, plus 2.25% or 3.25%, respectively, and in the case of LIBOR, a floor of 0.75%. The interest rate on the Match Group Term Loan at March 31, 2017 is 4.10%. Interest payments are due at least semi-annually through the term of the loan.

Match Group has a $500 million revolving credit facility (the "Match Group Credit Facility") that expires on October 7, 2020. At March 31, 2017 and December 31, 2016, there were no outstanding borrowings under the Match Group Credit Facility. The annual commitment fee on undrawn funds based on the current leverage ratio is 30 basis points. Borrowings under the Match Group Credit Facility bear interest, at Match Group'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 Match Group's consolidated net leverage ratio. The terms of the Match Group Credit Facility require Match Group to maintain a consolidated net leverage ratio of not more than 5.0 to 1.0 and a minimum interest coverage ratio of not less than 2.5 to 1.0 (in each case as defined in the agreement).

There are additional covenants under the Match Group Credit Facility and the Match Group Term Loan that limit the ability of Match Group and its subsidiaries to, among other things, incur indebtedness, pay dividends or make distributions. While the Match Group Term Loan remains outstanding, these same covenants under the Match Group Credit Agreement are more restrictive than the covenants that are applicable to the Match Group Credit Facility. Obligations under the Match Group Credit Facility and Match Group Term Loan are unconditionally guaranteed by certain Match Group wholly-owned domestic subsidiaries, and are also secured by the stock of certain Match Group domestic and foreign subsidiaries. The Match Group Term Loan and outstanding borrowings, if any, under the Match Group Credit Facility rank equally with each other, and have priority over the 2016 and 2015 Match Group Senior Notes to the extent of the value of the assets securing the borrowings under the Match Group Credit Agreement.

IAC Senior Notes:

The 2013 and 2012 Senior Notes were issued by IAC on November 15, 2013 and December 21, 2012, respectively. The 2013 and 2012 Senior Notes are unconditionally guaranteed by certain wholly-owned domestic subsidiaries, which are designated as guarantor subsidiaries, except neither Match Group nor any of its subsidiaries guarantee any debt of IAC, or are subject to any of the covenants related to such debt. The guarantor subsidiaries are the same for the 2013 and 2012 Senior Notes. See "Note 11—Guarantor and Non-guarantor Financial Information" for financial information relating to guarantor and non-guarantor.

For the three months ended March 31, 2017, the Company redeemed and repurchased $23.3 million of its 2013 Senior Notes and called an additional $5.0 million for redemption, and repurchased $3.3 million of its 2012 Senior Notes. For the three months ended March 31, 2016, the Company redeemed and repurchased $30.0 million of its 2013 Senior Notes and repurchased $2.9 million of its 2012 Senior Notes.

The indenture governing the 2013 Senior Notes contains covenants that would limit our ability to pay dividends or to make distributions and repurchase or redeem our stock in the event a default has occurred or our leverage ratio (as defined in the indenture) exceeds 3.0 to 1.0. At March 31, 2017, there were no limitations pursuant thereto. There are additional covenants that limit the Company's ability and the ability of its restricted subsidiaries to, among other things, (i) incur indebtedness, make investments, or sell assets in the event we are not in compliance with the financial ratio set forth in the indenture, and (ii) incur liens, enter into agreements limiting our restricted subsidiaries' ability to pay dividends, enter into transactions with affiliates and consolidate, merge or sell substantially all of our assets. The indenture governing the 2012 Senior Notes was amended to eliminate substantially all of the restrictive covenants contained therein in connection with the Match Exchange Offer.

IAC Credit Facility:

IAC has a $300.0 million revolving credit facility (the "IAC Credit Facility") that expires October 7, 2020. At March 31, 2017 and December 31, 2016, there were no outstanding borrowings under the IAC Credit Facility. The annual commitment fee on undrawn funds is currently 35 basis points, and is based on the leverage ratio most recently reported. Borrowings under the IAC Credit Facility bear interest, at the Company's option, at a base rate or LIBOR, in each case, plus an applicable margin, which is determined by reference to a pricing grid based on the Company's leverage ratio. The terms of the IAC Credit Facility require that the Company maintains a leverage ratio (as defined in the agreement) of not more than 3.25 to 1.0 and restrict our ability to incur additional indebtedness. Borrowings under the IAC Credit Facility are unconditionally guaranteed by the same domestic subsidiaries that guarantee the 2013 and 2012 Senior Notes and are also secured by the stock of certain of our domestic and foreign subsidiaries. The 2013 and 2012 Senior Notes rank equally with each other, and are subordinate to outstanding borrowings under the IAC Credit Facility to extent of the value of the assets securing such borrowings.

ACCUMULATED OTHER COMPREHENSIVE LOSS

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

ACCUMULATED OTHER COMPREHENSIVE LOSS

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



	Three Months Ended March 31, 2017
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Securities		Accumulated Other Comprehensive (Loss) Income
	(In thousands)
Balance as of January 1	$	(170,149	)	$	4,026	$	(166,123	)
Other comprehensive income before reclassifications^(a)	18,062			2		18,064
Amounts reclassified to earnings	714			—		714
Net current period other comprehensive income	18,776			2		18,778
Balance as of March 31	$	(151,373	)	$	4,028	$	(147,345	)

___________________


^(a)	At March 31, 2017 there was no tax benefit or provision on other comprehensive income.



	Three Months Ended March 31, 2016
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Securities			Accumulated Other Comprehensive (Loss) Income
	(In thousands)
Balance as of January 1	$	(154,645	)	$	2,542		$	(152,103	)
Other comprehensive income before reclassifications, net of tax benefit of $0.3 million related to unrealized losses on available-for-sale securities	7,182			5,437			12,619
Amounts reclassified to earnings	7,389			—			7,389
Net current period other comprehensive income	14,571			5,437			20,008
Reallocation of accumulated other comprehensive loss (income) related to the noncontrolling interests created in the Match Group initial public offering	21,589			(458		)	21,131
Balance as of March 31	$	(118,485	)	$	7,521		$	(110,964	)

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e716-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e709-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

+ Details

EARNINGS PER SHARE

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

EARNINGS PER SHARE

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



	Three Months Ended March 31,
	2017						2016
	Basic			Diluted			Basic		Diluted
	(In thousands, except per share data)
Numerator:
Net earnings	$	28,463		$	28,463		$	7,934	$	7,934
Net (earnings) loss attributable to noncontrolling interests	(2,254		)	(2,254		)	348		348
Impact from Match Group's dilutive securities^(a)	—			(2,430		)	—		(514		)
Net earnings attributable to IAC shareholders	$	26,209		$	23,779		$	8,282	$	7,768

Denominator:
Weighted average basic shares outstanding	78,193			78,193			82,027		82,027
Dilutive securities including subsidiary denominated equity, stock options and RSUs^(b)(c)	—			4,311			—		2,798
Denominator for earnings per share—weighted average shares^(b)(c)	78,193			82,504			82,027		84,825

Earnings per share attributable to IAC shareholders:
Earnings per share	$	0.34		$	0.29		$	0.10	$	0.09

________________________


^(a)	Represents the impact on earnings related to Match Group's dilutive securities under the if-converted method.

^(b)

If the effect is dilutive, weighted average common shares outstanding include the incremental shares that would be issued upon the assumed exercise of subsidiary denominated equity, stock options and vesting of restricted stock units ("RSUs"). For the three months ended March 31, 2017 and 2016, 2.0 million and 3.9 million potentially dilutive securities, respectively, are excluded from the calculation of diluted earnings per share because their inclusion would have been anti-dilutive.

^(c)

Market-based awards and performance-based stock units (“PSUs”) are considered contingently issuable shares. 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 are dilutive for the respective reporting periods. For the three months ended March 31, 2017 and 2016, 0.4 million and 1.0 million market-based awards and PSUs, respectively, were excluded from the calculation of diluted earnings per share because the market or performance conditions had not been met.

SEGMENT INFORMATION

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

SEGMENT INFORMATION

The overall concept that IAC employs in determining its operating segments is to present the financial information in a manner consistent with: how the chief operating decision maker views the businesses; how the businesses are organized as to segment management; and the focus of the businesses with regards to the types of services or products offered or the target market. Operating segments are combined for reporting purposes if they meet certain aggregation criteria, which principally relate to the similarity of their economic characteristics or, in the case of the Other reportable segment, do not meet the quantitative thresholds that require presentation as separate operating segments.



	Three Months Ended March 31,
	2017			2016
	(In thousands)
Revenue:
Match Group	$	298,764		$	260,401
HomeAdvisor	150,745			111,489
Video	50,577			55,095
Applications	158,897			159,796
Publishing	78,080			166,002
Other	23,980			66,514
Inter-segment eliminations	(210		)	(118		)
Total	$	760,833		$	819,179



	Three Months Ended March 31,
	2017			2016
	(In thousands)
Operating Income (Loss):
Match Group	$	58,871		$	34,186
HomeAdvisor	6,020			1,914
Video	(15,589		)	(17,485		)
Applications	32,768			27,678
Publishing	(5,788		)	6,776
Other	(5,621		)	(5,100		)
Corporate	(33,601		)	(26,552		)
Total	$	37,060		$	21,417



	Three Months Ended March 31,
	2017			2016
	(In thousands)
Adjusted EBITDA:^(a)
Match Group	$	86,231		$	67,274
HomeAdvisor	11,073			4,966
Video	(14,732		)	(16,901		)
Applications	34,933			31,058
Publishing	1,179			11,414
Other	(1,532		)	(1,629		)
Corporate	(15,176		)	(10,296		)
Total	$	101,976		$	85,886

________________________

^(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 business as a whole and our individual business segments, and this measure is one of the primary metrics by 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, and we believe that by excluding these items, Adjusted EBITDA corresponds more closely to the cash operating income generated from our business, from which capital investments are made and debt is serviced. Adjusted EBITDA has certain limitations in that it does not take into account the impact to IAC's statement of operations of certain expenses.

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



	Three Months Ended March 31,
	2017		2016
	(In thousands)
Revenue:
United States	$	548,598	$	604,491
All other countries	212,235		214,688
Total	$	760,833	$	819,179



	March 31, 2017		December 31, 2016
	(In thousands)
Long-lived assets (excluding goodwill and intangible assets):
United States	$	266,312	$	281,725
All other countries	25,409		24,523
Total	$	291,721	$	306,248

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



	Three Months Ended March 31, 2017
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	58,871		$	18,024	$	7,589	$	403	$	1,344	$	86,231
HomeAdvisor	6,020			690		2,996		1,367		—		11,073
Video	(15,589		)	—		544		313		—		(14,732		)
Applications	32,768			—		1,011		606		548		34,933
Publishing	(5,788		)	—		2,019		4,948		—		1,179
Other	(5,621		)	1,729		836		1,524		—		(1,532		)
Corporate	(33,601		)	13,532		4,893		—		—		(15,176		)
Total	37,060			$	33,975	$	19,888	$	9,161	$	1,892	$	101,976
Interest expense	(24,792		)
Other expense, net	(7,714		)
Earnings before income taxes	4,554
Income tax benefit	23,909
Net earnings	28,463
Net earnings attributable to noncontrolling interests	(2,254		)
Net earnings attributable to IAC shareholders	$	26,209



	Three Months Ended March 31, 2016
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments			Adjusted EBITDA
	(In thousands)
Match Group	$	34,186		$	17,448	$	5,751	$	6,728	$	3,161		$	67,274
HomeAdvisor	1,914			407		1,873		772		—			4,966
Video	(17,485		)	—		398		378		(192		)	(16,901		)
Applications	27,678			—		1,149		1,531		700			31,058
Publishing	6,776			—		2,189		2,449		—			11,414
Other	(5,100		)	50		1,459		1,962		—			(1,629		)
Corporate	(26,552		)	13,280		2,976		—		—			(10,296		)
Total	21,417			$	31,185	$	15,795	$	13,820	$	3,669		$	85,886
Interest expense	(27,860		)
Other income, net	15,897
Earnings before income taxes	9,454
Income tax provision	(1,520		)
Net earnings	7,934
Net loss attributable to noncontrolling interests	348
Net earnings attributable to IAC shareholders	$	8,282

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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+ Details

CONSOLIDATED FINANCIAL STATEMENT DETAILS

3 Months Ended

Mar. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

CONSOLIDATED FINANCIAL STATEMENT DETAILS

Other (expense) income, net consists of:



	Three Months Ended March 31,
	2017	2016
	(In thousands)
Other (expense) income, net	$(7,714)	$15,897

Other expense, net in 2017 includes $3.4 million in other-than-temporary impairment charges related to certain cost method investments as a result of our assessment of the near-term prospects and financial condition of the investees, a $2.7 million mark-to-market adjustment pertaining to a subsidiary denominated equity award issued to a non-employee and $2.6 million in net foreign currency exchange losses, partially offset by interest income of $1.6 million.

Other income, net in 2016^(a) includes a $13.5 million gain related to the sale of PriceRunner, $4.5 million in net foreign currency exchange gains, interest income of $1.6 million and $1.2 million in gains related to the sale of several long-term investments, partially offset by $2.3 million in other-than-temporary impairment charges related to certain cost method investments as a result of our assessment of the near-term prospects and financial condition of the investees, a $1.4 million loss on the 2013 and 2012 Senior Note redemptions and repurchases and a $1.2 million mark-to-market adjustment pertaining to a subsidiary denominated equity award issued to a non-employee.

________________________


^(a)	PriceRunner was sold on March 18, 2016. PriceRunner's full year 2016 revenue, operating income and Adjusted EBITDA were $7.1 million, $2.2 million and $2.6 million, respectively. Included in PriceRunner's operating income were $0.3 million of amortization of intangibles and $0.1 million of depreciation.

CONTINGENCIES	3 Months Ended
CONTINGENCIES	Mar. 31, 2017
Loss Contingency [Abstract]
CONTINGENCIES	CONTINGENCIES In the ordinary course of business, the Company is a party to various lawsuits. The Company establishes reserves for specific legal matters when it determines that the likelihood of an unfavorable outcome is probable and the loss is reasonably estimable. Management has also identified certain other legal matters where we believe an unfavorable outcome is not probable and, therefore, no reserve is established. Although management currently believes that resolving claims against us, including claims where an unfavorable outcome is reasonably possible, will not have a material impact on the liquidity, results of operations, or financial condition of the Company, these matters are subject to inherent uncertainties and management's view of these matters may change in the future. The Company also evaluates other contingent matters, including income and non-income tax contingencies, to assess the likelihood of an unfavorable outcome and estimated extent of potential loss. It is possible that an unfavorable outcome of one or more of these lawsuits or other contingencies could have a material impact on the liquidity, results of operations, or financial condition of the Company. See "Note 2—Income Taxes" for additional information related to income tax contingencies.

- Definition

The entire disclosure for loss and gain contingencies. Describes any existing condition, situation, or set of circumstances involving uncertainty as of the balance sheet date (or prior to issuance of the financial statements) as to a probable or reasonably possible loss incurred by an entity that will ultimately be resolved when one or more future events occur or fail to occur, and typically discloses the amount of loss recorded or a range of possible loss, or an assertion that no reasonable estimate can be made.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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+ Details

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION

3 Months Ended

Mar. 31, 2017

Guarantor and Nonguarantor Financial Statements [Abstract]

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION

The 2013 and 2012 Senior Notes are unconditionally guaranteed, jointly and severally, by certain domestic subsidiaries which are 100% owned by the Company. The following tables present condensed consolidating financial information at March 31, 2017 and December 31, 2016 and for the three months ended March 31, 2017 and 2016 for: IAC, on a stand-alone basis; the combined guarantor subsidiaries of IAC; the combined non-guarantor subsidiaries of IAC; and IAC on a consolidated basis.

Balance sheet at March 31, 2017:



	IAC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			IAC Consolidated
	(In thousands)
Cash and cash equivalents	$	503,916	$	—	$	893,122	$	—		$	1,397,038
Marketable securities	33,992		—		—		—			33,992
Accounts receivable, net	—		94,070		124,434		—			218,504
Other current assets	87,682		42,460		106,646		—			236,788
Intercompany receivables	—		774,949		999,644		(1,774,593		)	—
Property and equipment, net	3,938		172,997		114,786		—			291,721
Goodwill	—		521,740		1,392,393		—			1,914,133
Intangible assets, net	—		78,094		248,610		—			326,704
Investment in subsidiaries	3,683,127		554,431		—		(4,237,558		)	—
Other non-current assets	50,955		110,757		146,786		(108,051		)	200,447
Total assets	$	4,363,610	$	2,349,498	$	4,026,421	$	(6,120,202	)	$	4,619,327

Current portion of long-term debt	$	5,000	$	—	$	—	$	—		$	5,000
Accounts payable, trade	2,453		38,311		42,239		—			83,003
Other current liabilities	28,346		121,370		441,676		—			591,392
Long-term debt, net of current portion	394,741		—		1,177,241		—			1,571,982
Income taxes payable	—		3,474		29,310		(166		)	32,618
Intercompany liabilities	1,774,593		—		—		(1,774,593		)	—
Other long-term liabilities	310,418		21,643		67,168		(107,885		)	291,344
Redeemable noncontrolling interests	—		—		25,259		—			25,259
IAC shareholders' equity	1,848,059		2,164,700		2,072,858		(4,237,558		)	1,848,059
Noncontrolling interests	—		—		170,670		—			170,670
Total liabilities and shareholders' equity	$	4,363,610	$	2,349,498	$	4,026,421	$	(6,120,202	)	$	4,619,327

Balance sheet at December 31, 2016:



	IAC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			IAC Consolidated
	(In thousands)
Cash and cash equivalents	$	552,699	$	—	$	776,488	$	—		$	1,329,187
Marketable securities	89,342		—		—		—			89,342
Accounts receivable, net	—		90,807		129,331		—			220,138
Other current assets	71,152		30,515		102,401		—			204,068
Intercompany receivables	—		735,108		1,047,757		(1,782,865		)	—
Property and equipment, net	4,350		178,806		123,092		—			306,248
Goodwill	—		521,740		1,402,312		—			1,924,052
Intangible assets, net	—		83,179		272,272		—			355,451
Investment in subsidiaries	3,659,570		557,802		—		(4,217,372		)	—
Other non-current assets	52,228		111,037		169,595		(115,473		)	217,387
Total assets	$	4,429,341	$	2,308,994	$	4,023,248	$	(6,115,710	)	$	4,645,873

Current portion of long-term debt	$	20,000	$	—	$	—	$	—		$	20,000
Accounts payable, trade	2,697		38,283		21,883		—			62,863
Other current liabilities	42,159		120,279		468,087		—			630,525
Long-term debt, net of current portion	405,991		—		1,176,493		—			1,582,484
Income taxes payable	—		3,470		30,274		(216		)	33,528
Intercompany liabilities	1,782,865		—		—		(1,782,865		)	—
Other long-term liabilities	306,407		22,714		59,112		(115,257		)	272,976
Redeemable noncontrolling interests	—		—		32,827		—			32,827
IAC shareholders' equity	1,869,222		2,124,248		2,093,124		(4,217,372		)	1,869,222
Noncontrolling interests	—		—		141,448		—			141,448
Total liabilities and shareholders' equity	$	4,429,341	$	2,308,994	$	4,023,248	$	(6,115,710	)	$	4,645,873

Statement of operations for the three months ended March 31, 2017:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	309,136		$	455,646		$	(3,949	)	$	760,833
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	113			34,758			111,260			(173		)	145,958
Selling and marketing expense	326			175,268			178,607			(3,790		)	350,411
General and administrative expense	26,136			39,235			78,210			14			143,595
Product development expense	570			18,871			35,319			—			54,760
Depreciation	438			9,208			10,242			—			19,888
Amortization of intangibles	—			5,085			4,076			—			9,161
Total operating costs and expenses	27,583			282,425			417,714			(3,949		)	723,773
Operating (loss) income	(27,583		)	26,711			37,932			—			37,060
Equity in earnings (losses) of unconsolidated affiliates	51,405			(2,400		)	—			(49,005		)	—
Interest expense	(5,828		)	—			(18,964		)	—			(24,792		)
Other (expense) income, net	(5,805		)	6,224			(8,133		)	—			(7,714		)
Earnings before income taxes	12,189			30,535			10,835			(49,005		)	4,554
Income tax benefit (provision)	14,020			11,629			(1,740		)	—			23,909
Net earnings	26,209			42,164			9,095			(49,005		)	28,463
Net earnings attributable to noncontrolling interests	—			—			(2,254		)	—			(2,254		)
Net earnings attributable to IAC shareholders	$	26,209		$	42,164		$	6,841		$	(49,005	)	$	26,209
Comprehensive income attributable to IAC shareholders	$	44,987		$	44,482		$	29,272		$	(73,754	)	$	44,987

Statement of operations for the three months ended March 31, 2016:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	384,510		$	437,547		$	(2,878	)	$	819,179
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	212			72,817			121,316			(611		)	193,734
Selling and marketing expense	889			209,946			174,504			(2,275		)	383,064
General and administrative expense	18,972			38,345			74,926			8			132,251
Product development expense	1,379			24,770			32,949			—			59,098
Depreciation	437			6,972			8,386			—			15,795
Amortization of intangibles	—			1,986			11,834			—			13,820
Total operating costs and expenses	21,889			354,836			423,915			(2,878		)	797,762
Operating (loss) income	(21,889		)	29,674			13,632			—			21,417
Equity in earnings of unconsolidated affiliates	33,545			7,859			—			(41,404		)	—
Interest expense	(7,418		)	—			(20,442		)	—			(27,860		)
Other (expense) income, net	(9,985		)	4,106			21,776			—			15,897
(Loss) earnings before income taxes	(5,747		)	41,639			14,966			(41,404		)	9,454
Income tax benefit (provision)	14,029			(13,216		)	(2,333		)	—			(1,520		)
Net earnings	8,282			28,423			12,633			(41,404		)	7,934
Net loss attributable to noncontrolling interests	—			—			348			—			348
Net earnings attributable to IAC shareholders	$	8,282		$	28,423		$	12,981		$	(41,404	)	$	8,282
Comprehensive income attributable to IAC shareholders	$	28,290		$	34,921		$	28,704		$	(63,625	)	$	28,290

Statement of cash flows for the three months ended March 31, 2017:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities	$	(18,973	)	$	28,369		$	58,409		$	—		$	67,805
Cash flows from investing activities:
Acquisitions, net of cash acquired	—			—			(52,365		)	—			(52,365		)
Capital expenditures	(87		)	(3,369		)	(7,701		)	—			(11,157		)
Proceeds from maturities and sales of marketable debt securities	75,350			—			—			—			75,350
Purchases of marketable debt securities	(19,926		)	—			—			—			(19,926		)
Purchases of investments	—			—			(29		)	—			(29		)
Net proceeds from the sale of businesses and investments	—			—			97,496			—			97,496
Intercompany	(5,295		)	—			—			5,295			—
Other, net	—			31			182			—			213
Net cash provided by (used in) investing activities	50,042			(3,338		)	37,583			5,295			89,582
Cash flows from financing activities:
Purchase of treasury stock	(56,424		)	—			—			—			(56,424		)
Repurchases of Senior Notes	(26,590		)	—			—			—			(26,590		)
Issuance of IAC common stock pursuant to stock-based awards, net of withholding taxes	(25,327		)	—			—			—			(25,327		)
Issuance of Match Group common stock pursuant to stock-based awards, net of withholding taxes	—			—			5,030			—			5,030
Purchase of noncontrolling interests	—			(11,840		)	(419		)	—			(12,259		)
Acquisition-related contingent consideration payments	—			—			(3,860		)	—			(3,860		)
Funds returned from escrow for MyHammer tender offer	—			—			10,604			—			10,604
Intercompany	13,191			(13,191		)	5,295			(5,295		)	—
Other, net	15,288			—			—			—			15,288
Net cash (used in) provided by financing activities	(79,862		)	(25,031		)	16,650			(5,295		)	(93,538		)
Total cash (used in) provided by	(48,793		)	—			112,642			—			63,849
Effect of exchange rate changes on cash and cash equivalents	10			—			3,992			—			4,002
Net (decrease) increase in cash and cash equivalents	(48,783		)	—			116,634			—			67,851
Cash and cash equivalents at beginning of period	552,699			—			776,488			—			1,329,187
Cash and cash equivalents at end of period	$	503,916		$	—		$	893,122		$	—		$	1,397,038

Statement of cash flows for the three months ended March 31, 2016:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities	$	(47,909	)	$	53,257		$	34,013		$	—		$	39,361
Cash flows from investing activities:
Acquisitions, net of cash acquired	—			—			(2,252		)	—			(2,252		)
Capital expenditures	(281		)	(7,372		)	(8,437		)	—			(16,090		)
Investments in time deposits	—			—			(87,500		)	—			(87,500		)
Purchases of marketable debt securities	(66,891		)	—			—			—			(66,891		)
Purchases of investments	—			—			(813		)	—			(813		)
Net proceeds from the sale of businesses and investments	10,000			—			83,097			—			93,097
Intercompany	(18,630		)	—			—			18,630			—
Other, net	—			155			4,225			—			4,380
Net cash used in investing activities	(75,802		)	(7,217		)	(11,680		)	18,630			(76,069		)
Cash flows from financing activities:
Purchase of treasury stock	(135,938		)	—			—			—			(135,938		)
Principal payment on Match Group Term Loan	—			—			(10,000		)	—			(10,000		)
Repurchases of Senior Notes	(32,912		)	—			—			—			(32,912		)
Issuance of IAC common stock pursuant to stock-based awards, net of withholding taxes	(14,919		)	—			—			—			(14,919		)
Issuance of Match Group common stock pursuant to stock-based awards, net of withholding taxes	—			—			(4,453		)	—			(4,453		)
Purchase of noncontrolling interests	(1,400		)	—			—			—			(1,400		)
Acquisition-related contingent consideration payments	—			(312		)	—			—			(312		)
Intercompany	45,728			(45,728		)	18,630			(18,630		)	—
Other, net	(5,000		)	—			(856		)	—			(5,856		)
Net cash (used in) provided by financing activities	(144,441		)	(46,040		)	3,321			(18,630		)	(205,790		)
Total cash (used in) provided by	(268,152		)	—			25,654			—			(242,498		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(285		)	—			(285		)
Net (decrease) increase in cash and cash equivalents	(268,152		)	—			25,369			—			(242,783		)
Cash and cash equivalents at beginning of period	1,073,053			—			408,394			—			1,481,447
Cash and cash equivalents at end of period	$	804,901		$	—		$	433,763		$	—		$	1,238,664

SUBSEQUENT EVENT	3 Months Ended
SUBSEQUENT EVENT	Mar. 31, 2017
Subsequent Events [Abstract]
SUBSEQUENT EVENT	SUBSEQUENT EVENT On May 1, 2017, the Company announced that it has entered into a definitive agreement to combine IAC’s HomeAdvisor and Angie’s List into a new, publicly traded company, to be called ANGI Homeservices Inc. IAC will own between approximately 87% and 90% of the new company at closing, which is expected to take place in the fourth quarter of 2017.

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The Company prepares its consolidated financial statements in accordance with U.S. generally accepted accounting principles ("GAAP").
Basis of Consolidation and Accounting for Investments	Basis of Consolidation and Accounting for Investments The consolidated financial statements include the accounts of the Company, all entities that are wholly-owned by the Company and all entities in which the Company has a controlling financial interest. Intercompany transactions and accounts have been eliminated. Investments in the common stock or in-substance common stock of entities in which the Company has the ability to exercise significant influence over the operating and financial matters of the investee, but does not have a controlling financial interest, are accounted for using the equity method and are included in "Long-term investments" in the accompanying consolidated balance sheet. The accompanying unaudited consolidated financial statements have been prepared in accordance with GAAP for interim financial information and with the rules and regulations of the Securities and Exchange Commission. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, the accompanying unaudited consolidated financial statements include all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation. Interim results are not necessarily indicative of the results that may be expected for the full year. The accompanying unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016.
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 marketable securities and other investments; the recoverability of goodwill and indefinite-lived intangible assets; the useful lives and recoverability of definite-lived intangible assets and property and equipment; the carrying value of accounts receivable, including the determination of the allowance for doubtful accounts; the determination of revenue reserves; the fair value of acquisition-related contingent consideration arrangements; the liabilities for uncertain tax positions; the valuation allowance for deferred income tax assets; and the fair value of and forfeiture rates for stock-based awards, among others. The Company bases its estimates and judgments on historical experience, its forecasts and budgets and other factors that the Company considers relevant.
Certain Risks and Concentrations	Certain Risks and Concentrations A significant portion of the Company's revenue is derived from online advertising, the market for which is highly competitive and rapidly changing. Significant changes in this industry or changes in advertising spending behavior or in customer buying behavior could adversely affect our operating results. Most of the Company's online advertising revenue is attributable to a services agreement with Google Inc. ("Google"). For the three months ended March 31, 2017 and 2016, revenue from Google represents 25% and 35%, respectively, of the Company's consolidated revenue. The Company's services agreement became effective on April 1, 2016, following the expiration of the previous services agreement. The services agreement expires on March 31, 2020; however, the Company may choose to terminate the agreement effective March 31, 2019. The services agreement requires that we comply with certain guidelines promulgated by Google. Google may generally unilaterally update its policies and guidelines without advance notice, which could in turn require modifications to, or prohibit and/or render obsolete certain of our products, services and/or business practices, which could be costly to address or otherwise have an adverse effect on our business, financial condition and results of operations.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Accounting Pronouncements not yet adopted by the Company In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers, which clarifies the principles for recognizing revenue and develops a common standard for all industries. ASU 2014-09 was subsequently amended during 2015 and 2016; these amendments provide further revenue recognition guidance related to principal versus agent considerations, performance obligations and licensing, and narrow-scope improvements and practical expedients. ASU No. 2014-09 is a comprehensive revenue recognition standard that will supersede nearly all existing revenue recognition guidance under GAAP. The new standard provides a single principles-based, five-step model to be applied to all contracts with customers. This five-step model includes (1) identifying the contract(s) with the customer, (2) identifying the performance obligations in the contract, (3) determining the transaction price, (4) allocating the transaction price to the performance obligations in the contract and (5) recognizing revenue when each performance obligation is satisfied. More specifically, revenue will be recognized when promised goods or services are transferred to the customer in an amount that reflects the consideration expected in exchange for those goods or services. ASU No. 2014-09 is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted for interim and annual reporting periods beginning after December 15, 2016. Upon adoption, ASU No. 2014-09 may either be applied retrospectively to each prior period presented or using the modified retrospective approach with the cumulative effect recognized as of the date of initial application. While the Company’s evaluation of the impact the adoption of ASU No. 2014-09 on its consolidated financial statements continues, it has progressed to the point where we have reached certain preliminary determinations. The Company does not expect the adoption of ASU No. 2014-09 to have a material effect on its consolidated financial statements. The Company will adopt ASU No. 2014-09 using the modified retrospective approach effective January 1, 2018. Therefore, the cumulative effect of adoption will be reflected as an adjustment to beginning retained earnings in the Form 10-Q for the period ending March 31, 2018. The adoption of ASU No. 2014-09 will primarily affect the Company’s HomeAdvisor and Applications segments. The effect on HomeAdvisor will be that sales commissions, which represent the incremental direct costs of obtaining a service professional contract, will be capitalized and amortized over the average life of a service professional. These costs are expensed as incurred today. Within Applications, the primary effect will be to accelerate the recognition of the portion of the revenue of certain desktop applications sold by SlimWare that qualify as functional intellectual property under ASU No. 2014-09. This revenue is currently deferred and recognized over the applicable subscription term. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which supersedes existing guidance on accounting for leases in "Leases (Topic 840)" and generally requires all leases to be recognized in the statement of financial position. The provisions of ASU No. 2016-02 are effective for reporting periods beginning after December 15, 2018; early adoption is permitted. The provisions of ASU No. 2016-02 are to be applied using a modified retrospective approach. The Company is currently evaluating the impact the adoption of this standard update will have on its consolidated financial statements. Accounting Pronouncements adopted by the Company In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which clarifies how cash receipts and cash payments in certain transactions are presented and classified on the statement of cash flows. The provisions of ASU No. 2016-15 are effective for reporting periods beginning after December 15, 2017, including interim periods, and will require adoption on a retrospective basis unless it is impracticable to apply, in which case we would be required to apply the amendments prospectively as of the earliest date practicable; early adoption is permitted. Upon adoption, cash payments not made soon after the acquisition date of a business combination to settle a contingent consideration liability are separated and classified as cash outflows for operating activities and financing activities. Cash payments up to the amount of the contingent consideration liability recognized at the acquisition date (including measurement-period adjustments) are classified as financing activities; any excess is classified as operating activities. Cash payments made soon after the acquisition date of a business combination by an acquirer to settle a contingent consideration liability are classified as cash outflows for investing activities. The Company early adopted the provisions of ASU No. 2016-15 on January 1, 2017. As a result of the adoption of ASU No. 2016-15, $11.1 million of acquisition-related contingent consideration payments for the three months ended March 31, 2017 was in excess of the liability recognized at the acquisition date and, therefore, has been classified as a cash outflow in "Other adjustments, net" within net cash provided by operating activities in the accompanying consolidated statement of cash flows. In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The Company adopted the provisions of ASU No. 2016-09 on January 1, 2017. Excess tax benefits or deficiencies related to equity awards to employees upon exercise of stock options and the vesting of restricted stock units after January 1, 2017 are (i) reflected in the consolidated statement of operations as a component of the provision for income taxes, rather than recognized in equity, and (ii) reflected as operating, rather than financing, cash flows in our consolidated statement of cash flows. Excess tax benefits for the three months ended March 31, 2017 were $26.8 million. Excess tax benefits of $15.3 million for the three months ended March 31, 2016 were reclassified in the consolidated statement of cash flows to conform to the current year presentation. Upon adoption, the calculation of fully diluted shares excludes excess tax benefits from the assumed proceeds in applying the treasury stock method, they previously were included in the calculation; this change increased fully diluted shares by approximately 1.3 million shares for the three months ended March 31, 2017. The Company continues to account for forfeitures using an estimated forfeiture rate. In January 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, which is intended to simplify the accounting for goodwill impairment. The guidance eliminates the requirement to calculate the implied fair value of goodwill under today’s two-step impairment test to measure a goodwill impairment charge. The provisions of ASU No. 2017-04 are effective for reporting periods beginning after December 15, 2019; early adoption is permitted. The provisions of ASU No. 2017-04 are to be applied using a prospective approach. The Company early adopted the provisions of ASU No. 2017-04 on January 1, 2017 and the adoption of this standard update did not have a material impact on its consolidated financial statements.
Reclassifications	Reclassifications Certain prior year amounts have been reclassified to conform to the current year presentation.

MARKETABLE SECURITIES (Tables)

3 Months Ended

Mar. 31, 2017

Marketable Securities [Abstract]

Schedule of Current Available-for-Sale Marketable Securities

At March 31, 2017, available-for-sale marketable securities are as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Commercial paper	$	21,949	$	—	$	—		$	21,949
Treasury discount notes	9,995		—		(2		)	9,993
Corporate debt securities	2,053		—		(3		)	2,050
Total debt securities	33,997		—		(5		)	33,992
Total marketable securities	$	33,997	$	—	$	(5	)	$	33,992

At December 31, 2016, available-for-sale marketable securities are as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Commercial paper	$	49,797	$	—	$	—		$	49,797
Treasury discount notes	34,978		—		(4		)	34,974
Corporate debt securities	4,575		2		(6		)	4,571
Total debt securities	89,350		2		(10		)	89,342
Total marketable securities	$	89,350	$	2	$	(10	)	$	89,342

Schedule of Proceeds From Maturities and Sales of Available-for-Sale Marketable Securities and the Related Gross Realized Gains and Losses

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



	Three Months Ended March 31,
	2017		2016
	(In thousands)
Proceeds from maturities and sales of available-for-sale marketable securities	$	75,350	$	10,000

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

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

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



	March 31, 2017
	Quoted Market Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Total Fair Value Measurements
	(In thousands)
Assets:
Cash equivalents:
Money market funds	$	689,129	$	—	$	—		$	689,129
Commercial paper	—		149,940		—			149,940
Time deposits	—		105,397		—			105,397
Treasury discount notes	74,971		—		—			74,971
Marketable securities:
Commercial paper	—		21,949		—			21,949
Treasury discount notes	9,993		—		—			9,993
Corporate debt securities	—		2,050		—			2,050
Total	$	774,093	$	279,336	$	—		1,053,429

Liabilities:
Contingent consideration arrangements	$	—	$	—	$	(21,821	)	$	(21,821	)



	December 31, 2016
	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	$	667,662	$	—	$	—		$	667,662
Commercial paper	—		123,640		—			123,640
Time deposits	—		79,000		—			79,000
Treasury discount notes	24,991		—		—			24,991
Marketable securities:
Commercial paper	—		49,797		—			49,797
Treasury discount notes	34,974		—		—			34,974
Corporate debt securities	—		4,571		—			4,571
Total	$	727,627	$	257,008	$	—		$	984,635

Liabilities:
Contingent consideration arrangements	$	—	$	—	$	(33,871	)	$	(33,871	)

Schedule of Changes in Assets 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 March 31,
	2017			2016
	Contingent Consideration Arrangements			Auction Rate Security			Contingent Consideration Arrangements
	(In thousands)
Balance at January 1	$	(33,871	)	$	4,050		$	(33,873	)
Total net (losses) gains:
Included in earnings:
Fair value adjustments	(1,891		)	—			(3,669		)
Included in other comprehensive (loss) income	(1,059		)	5,950			(1,906		)
Fair value at date of acquisition	—			—			(185		)
Settlements	15,000			—			312
Proceeds from sale	—			(10,000		)	—
Other	—			—			2,078
Balance at March 31	$	(21,821	)	$	—		$	(37,243	)

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 March 31,
	2017			2016
	Contingent Consideration Arrangements			Auction Rate Security			Contingent Consideration Arrangements
	(In thousands)
Balance at January 1	$	(33,871	)	$	4,050		$	(33,873	)
Total net (losses) gains:
Included in earnings:
Fair value adjustments	(1,891		)	—			(3,669		)
Included in other comprehensive (loss) income	(1,059		)	5,950			(1,906		)
Fair value at date of acquisition	—			—			(185		)
Settlements	15,000			—			312
Proceeds from sale	—			(10,000		)	—
Other	—			—			2,078
Balance at March 31	$	(21,821	)	$	—		$	(37,243	)

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

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



	March 31, 2017						December 31, 2016
	Carrying Value			Fair Value			Carrying Value			Fair Value
	(In thousands)
Current portion of long-term debt	$	(5,000	)	$	(5,264	)	$	(20,000	)	$	(20,311	)
Long-term debt, net of current portion	(1,571,982		)	(1,655,064		)	(1,582,484		)	(1,657,861		)

LONG-TERM DEBT (Tables)

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Schedule of Long-term Debt

Long-term debt consists of:



	March 31, 2017		December 31, 2016
	(In thousands)
Match Group Debt:
6.75% Senior Notes due December 15, 2022 (the "2015 Match Group Senior Notes"); interest payable each June 15 and December 15, which commenced June 15, 2016	$	445,172	$	445,172
6.375% Senior Notes due June 1, 2024 (the "2016 Match Group Senior Notes"); interest payable each June 1 and December 1, which commenced December 1, 2016	400,000		400,000
Match Group Term Loan due November 16, 2022 ^(a)	350,000		350,000
Total Match Group long-term debt	1,195,172		1,195,172
Less: Unamortized original issue discount and original issue premium, net	5,023		5,245
Less: Unamortized debt issuance costs	12,908		13,434
Total Match Group debt	1,177,241		1,176,493

IAC Debt:
4.875% Senior Notes due November 30, 2018 (the "2013 Senior Notes"); interest payable each May 30 and November 30, which commenced May 30, 2014	366,874		390,214
4.75% Senior Notes due December 15, 2022 (the "2012 Senior Notes"); interest payable each June 15 and December 15, which commenced June 15, 2013	34,859		38,109
Total IAC long-term debt	401,733		428,323
Less: Current portion of IAC long-term debt	5,000		20,000
Less: Unamortized debt issuance costs	1,992		2,332
Total IAC debt, net of current portion	$	394,741	$	405,991

Total long-term debt, net of current portion	$	1,571,982	$	1,582,484

________________________


^(a)	The Match Group Term Loan matures on November 16, 2022; provided that, if any of the 2015 Match Group Senior Notes remain outstanding on the date that is 91 days prior to the maturity date of the 2015 Match Group Senior Notes, the Match Group Term Loan maturity date shall be the date that is 91 days prior to the maturity date of the 2015 Match Group Senior Notes.

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

+ Details

ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Schedule of Accumulated Other Comprehensive (Loss) Income

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



	Three Months Ended March 31, 2017
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Securities		Accumulated Other Comprehensive (Loss) Income
	(In thousands)
Balance as of January 1	$	(170,149	)	$	4,026	$	(166,123	)
Other comprehensive income before reclassifications^(a)	18,062			2		18,064
Amounts reclassified to earnings	714			—		714
Net current period other comprehensive income	18,776			2		18,778
Balance as of March 31	$	(151,373	)	$	4,028	$	(147,345	)

___________________


^(a)	At March 31, 2017 there was no tax benefit or provision on other comprehensive income.



	Three Months Ended March 31, 2016
	Foreign Currency Translation Adjustment			Unrealized Gains On Available-For-Sale Securities			Accumulated Other Comprehensive (Loss) Income
	(In thousands)
Balance as of January 1	$	(154,645	)	$	2,542		$	(152,103	)
Other comprehensive income before reclassifications, net of tax benefit of $0.3 million related to unrealized losses on available-for-sale securities	7,182			5,437			12,619
Amounts reclassified to earnings	7,389			—			7,389
Net current period other comprehensive income	14,571			5,437			20,008
Reallocation of accumulated other comprehensive loss (income) related to the noncontrolling interests created in the Match Group initial public offering	21,589			(458		)	21,131
Balance as of March 31	$	(118,485	)	$	7,521		$	(110,964	)

EARNINGS PER SHARE (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings (Loss) Per Share

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



	Three Months Ended March 31,
	2017						2016
	Basic			Diluted			Basic		Diluted
	(In thousands, except per share data)
Numerator:
Net earnings	$	28,463		$	28,463		$	7,934	$	7,934
Net (earnings) loss attributable to noncontrolling interests	(2,254		)	(2,254		)	348		348
Impact from Match Group's dilutive securities^(a)	—			(2,430		)	—		(514		)
Net earnings attributable to IAC shareholders	$	26,209		$	23,779		$	8,282	$	7,768

Denominator:
Weighted average basic shares outstanding	78,193			78,193			82,027		82,027
Dilutive securities including subsidiary denominated equity, stock options and RSUs^(b)(c)	—			4,311			—		2,798
Denominator for earnings per share—weighted average shares^(b)(c)	78,193			82,504			82,027		84,825

Earnings per share attributable to IAC shareholders:
Earnings per share	$	0.34		$	0.29		$	0.10	$	0.09

________________________


^(a)	Represents the impact on earnings related to Match Group's dilutive securities under the if-converted method.

^(b)

^(c)

SEGMENT INFORMATION (Tables)

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Schedule of Segment Reporting Information



	Three Months Ended March 31,
	2017			2016
	(In thousands)
Revenue:
Match Group	$	298,764		$	260,401
HomeAdvisor	150,745			111,489
Video	50,577			55,095
Applications	158,897			159,796
Publishing	78,080			166,002
Other	23,980			66,514
Inter-segment eliminations	(210		)	(118		)
Total	$	760,833		$	819,179



	Three Months Ended March 31,
	2017			2016
	(In thousands)
Operating Income (Loss):
Match Group	$	58,871		$	34,186
HomeAdvisor	6,020			1,914
Video	(15,589		)	(17,485		)
Applications	32,768			27,678
Publishing	(5,788		)	6,776
Other	(5,621		)	(5,100		)
Corporate	(33,601		)	(26,552		)
Total	$	37,060		$	21,417



	Three Months Ended March 31,
	2017			2016
	(In thousands)
Adjusted EBITDA:^(a)
Match Group	$	86,231		$	67,274
HomeAdvisor	11,073			4,966
Video	(14,732		)	(16,901		)
Applications	34,933			31,058
Publishing	1,179			11,414
Other	(1,532		)	(1,629		)
Corporate	(15,176		)	(10,296		)
Total	$	101,976		$	85,886

________________________

^(a)

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

Geographic information about revenue and long-lived assets is presented below:



	Three Months Ended March 31,
	2017		2016
	(In thousands)
Revenue:
United States	$	548,598	$	604,491
All other countries	212,235		214,688
Total	$	760,833	$	819,179



	March 31, 2017		December 31, 2016
	(In thousands)
Long-lived assets (excluding goodwill and intangible assets):
United States	$	266,312	$	281,725
All other countries	25,409		24,523
Total	$	291,721	$	306,248

Schedule of Reconciliation of Operating Income (Loss) to Adjusted EBITDA

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



	Three Months Ended March 31, 2017
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments		Adjusted EBITDA
	(In thousands)
Match Group	$	58,871		$	18,024	$	7,589	$	403	$	1,344	$	86,231
HomeAdvisor	6,020			690		2,996		1,367		—		11,073
Video	(15,589		)	—		544		313		—		(14,732		)
Applications	32,768			—		1,011		606		548		34,933
Publishing	(5,788		)	—		2,019		4,948		—		1,179
Other	(5,621		)	1,729		836		1,524		—		(1,532		)
Corporate	(33,601		)	13,532		4,893		—		—		(15,176		)
Total	37,060			$	33,975	$	19,888	$	9,161	$	1,892	$	101,976
Interest expense	(24,792		)
Other expense, net	(7,714		)
Earnings before income taxes	4,554
Income tax benefit	23,909
Net earnings	28,463
Net earnings attributable to noncontrolling interests	(2,254		)
Net earnings attributable to IAC shareholders	$	26,209



	Three Months Ended March 31, 2016
	Operating Income (Loss)			Stock-Based Compensation Expense		Depreciation		Amortization of Intangibles		Acquisition-related Contingent Consideration Fair Value Adjustments			Adjusted EBITDA
	(In thousands)
Match Group	$	34,186		$	17,448	$	5,751	$	6,728	$	3,161		$	67,274
HomeAdvisor	1,914			407		1,873		772		—			4,966
Video	(17,485		)	—		398		378		(192		)	(16,901		)
Applications	27,678			—		1,149		1,531		700			31,058
Publishing	6,776			—		2,189		2,449		—			11,414
Other	(5,100		)	50		1,459		1,962		—			(1,629		)
Corporate	(26,552		)	13,280		2,976		—		—			(10,296		)
Total	21,417			$	31,185	$	15,795	$	13,820	$	3,669		$	85,886
Interest expense	(27,860		)
Other income, net	15,897
Earnings before income taxes	9,454
Income tax provision	(1,520		)
Net earnings	7,934
Net loss attributable to noncontrolling interests	348
Net earnings attributable to IAC shareholders	$	8,282

CONSOLIDATED FINANCIAL STATEMENT DETAILS (Tables)

3 Months Ended

Mar. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Other (Expense) Income, Net

Other (expense) income, net consists of:



	Three Months Ended March 31,
	2017	2016
	(In thousands)
Other (expense) income, net	$(7,714)	$15,897

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Tables)

3 Months Ended

Mar. 31, 2017

Guarantor and Nonguarantor Financial Statements [Abstract]

Schedule of Condensed Balance Sheet

Balance sheet at March 31, 2017:



	IAC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			IAC Consolidated
	(In thousands)
Cash and cash equivalents	$	503,916	$	—	$	893,122	$	—		$	1,397,038
Marketable securities	33,992		—		—		—			33,992
Accounts receivable, net	—		94,070		124,434		—			218,504
Other current assets	87,682		42,460		106,646		—			236,788
Intercompany receivables	—		774,949		999,644		(1,774,593		)	—
Property and equipment, net	3,938		172,997		114,786		—			291,721
Goodwill	—		521,740		1,392,393		—			1,914,133
Intangible assets, net	—		78,094		248,610		—			326,704
Investment in subsidiaries	3,683,127		554,431		—		(4,237,558		)	—
Other non-current assets	50,955		110,757		146,786		(108,051		)	200,447
Total assets	$	4,363,610	$	2,349,498	$	4,026,421	$	(6,120,202	)	$	4,619,327

Current portion of long-term debt	$	5,000	$	—	$	—	$	—		$	5,000
Accounts payable, trade	2,453		38,311		42,239		—			83,003
Other current liabilities	28,346		121,370		441,676		—			591,392
Long-term debt, net of current portion	394,741		—		1,177,241		—			1,571,982
Income taxes payable	—		3,474		29,310		(166		)	32,618
Intercompany liabilities	1,774,593		—		—		(1,774,593		)	—
Other long-term liabilities	310,418		21,643		67,168		(107,885		)	291,344
Redeemable noncontrolling interests	—		—		25,259		—			25,259
IAC shareholders' equity	1,848,059		2,164,700		2,072,858		(4,237,558		)	1,848,059
Noncontrolling interests	—		—		170,670		—			170,670
Total liabilities and shareholders' equity	$	4,363,610	$	2,349,498	$	4,026,421	$	(6,120,202	)	$	4,619,327

Balance sheet at December 31, 2016:



	IAC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations			IAC Consolidated
	(In thousands)
Cash and cash equivalents	$	552,699	$	—	$	776,488	$	—		$	1,329,187
Marketable securities	89,342		—		—		—			89,342
Accounts receivable, net	—		90,807		129,331		—			220,138
Other current assets	71,152		30,515		102,401		—			204,068
Intercompany receivables	—		735,108		1,047,757		(1,782,865		)	—
Property and equipment, net	4,350		178,806		123,092		—			306,248
Goodwill	—		521,740		1,402,312		—			1,924,052
Intangible assets, net	—		83,179		272,272		—			355,451
Investment in subsidiaries	3,659,570		557,802		—		(4,217,372		)	—
Other non-current assets	52,228		111,037		169,595		(115,473		)	217,387
Total assets	$	4,429,341	$	2,308,994	$	4,023,248	$	(6,115,710	)	$	4,645,873

Current portion of long-term debt	$	20,000	$	—	$	—	$	—		$	20,000
Accounts payable, trade	2,697		38,283		21,883		—			62,863
Other current liabilities	42,159		120,279		468,087		—			630,525
Long-term debt, net of current portion	405,991		—		1,176,493		—			1,582,484
Income taxes payable	—		3,470		30,274		(216		)	33,528
Intercompany liabilities	1,782,865		—		—		(1,782,865		)	—
Other long-term liabilities	306,407		22,714		59,112		(115,257		)	272,976
Redeemable noncontrolling interests	—		—		32,827		—			32,827
IAC shareholders' equity	1,869,222		2,124,248		2,093,124		(4,217,372		)	1,869,222
Noncontrolling interests	—		—		141,448		—			141,448
Total liabilities and shareholders' equity	$	4,429,341	$	2,308,994	$	4,023,248	$	(6,115,710	)	$	4,645,873

Schedule of Condensed Income Statement

Statement of operations for the three months ended March 31, 2017:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	309,136		$	455,646		$	(3,949	)	$	760,833
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	113			34,758			111,260			(173		)	145,958
Selling and marketing expense	326			175,268			178,607			(3,790		)	350,411
General and administrative expense	26,136			39,235			78,210			14			143,595
Product development expense	570			18,871			35,319			—			54,760
Depreciation	438			9,208			10,242			—			19,888
Amortization of intangibles	—			5,085			4,076			—			9,161
Total operating costs and expenses	27,583			282,425			417,714			(3,949		)	723,773
Operating (loss) income	(27,583		)	26,711			37,932			—			37,060
Equity in earnings (losses) of unconsolidated affiliates	51,405			(2,400		)	—			(49,005		)	—
Interest expense	(5,828		)	—			(18,964		)	—			(24,792		)
Other (expense) income, net	(5,805		)	6,224			(8,133		)	—			(7,714		)
Earnings before income taxes	12,189			30,535			10,835			(49,005		)	4,554
Income tax benefit (provision)	14,020			11,629			(1,740		)	—			23,909
Net earnings	26,209			42,164			9,095			(49,005		)	28,463
Net earnings attributable to noncontrolling interests	—			—			(2,254		)	—			(2,254		)
Net earnings attributable to IAC shareholders	$	26,209		$	42,164		$	6,841		$	(49,005	)	$	26,209
Comprehensive income attributable to IAC shareholders	$	44,987		$	44,482		$	29,272		$	(73,754	)	$	44,987

Statement of operations for the three months ended March 31, 2016:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Revenue	$	—		$	384,510		$	437,547		$	(2,878	)	$	819,179
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	212			72,817			121,316			(611		)	193,734
Selling and marketing expense	889			209,946			174,504			(2,275		)	383,064
General and administrative expense	18,972			38,345			74,926			8			132,251
Product development expense	1,379			24,770			32,949			—			59,098
Depreciation	437			6,972			8,386			—			15,795
Amortization of intangibles	—			1,986			11,834			—			13,820
Total operating costs and expenses	21,889			354,836			423,915			(2,878		)	797,762
Operating (loss) income	(21,889		)	29,674			13,632			—			21,417
Equity in earnings of unconsolidated affiliates	33,545			7,859			—			(41,404		)	—
Interest expense	(7,418		)	—			(20,442		)	—			(27,860		)
Other (expense) income, net	(9,985		)	4,106			21,776			—			15,897
(Loss) earnings before income taxes	(5,747		)	41,639			14,966			(41,404		)	9,454
Income tax benefit (provision)	14,029			(13,216		)	(2,333		)	—			(1,520		)
Net earnings	8,282			28,423			12,633			(41,404		)	7,934
Net loss attributable to noncontrolling interests	—			—			348			—			348
Net earnings attributable to IAC shareholders	$	8,282		$	28,423		$	12,981		$	(41,404	)	$	8,282
Comprehensive income attributable to IAC shareholders	$	28,290		$	34,921		$	28,704		$	(63,625	)	$	28,290

Schedule of Condensed Cash Flow Statement

Statement of cash flows for the three months ended March 31, 2017:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities	$	(18,973	)	$	28,369		$	58,409		$	—		$	67,805
Cash flows from investing activities:
Acquisitions, net of cash acquired	—			—			(52,365		)	—			(52,365		)
Capital expenditures	(87		)	(3,369		)	(7,701		)	—			(11,157		)
Proceeds from maturities and sales of marketable debt securities	75,350			—			—			—			75,350
Purchases of marketable debt securities	(19,926		)	—			—			—			(19,926		)
Purchases of investments	—			—			(29		)	—			(29		)
Net proceeds from the sale of businesses and investments	—			—			97,496			—			97,496
Intercompany	(5,295		)	—			—			5,295			—
Other, net	—			31			182			—			213
Net cash provided by (used in) investing activities	50,042			(3,338		)	37,583			5,295			89,582
Cash flows from financing activities:
Purchase of treasury stock	(56,424		)	—			—			—			(56,424		)
Repurchases of Senior Notes	(26,590		)	—			—			—			(26,590		)
Issuance of IAC common stock pursuant to stock-based awards, net of withholding taxes	(25,327		)	—			—			—			(25,327		)
Issuance of Match Group common stock pursuant to stock-based awards, net of withholding taxes	—			—			5,030			—			5,030
Purchase of noncontrolling interests	—			(11,840		)	(419		)	—			(12,259		)
Acquisition-related contingent consideration payments	—			—			(3,860		)	—			(3,860		)
Funds returned from escrow for MyHammer tender offer	—			—			10,604			—			10,604
Intercompany	13,191			(13,191		)	5,295			(5,295		)	—
Other, net	15,288			—			—			—			15,288
Net cash (used in) provided by financing activities	(79,862		)	(25,031		)	16,650			(5,295		)	(93,538		)
Total cash (used in) provided by	(48,793		)	—			112,642			—			63,849
Effect of exchange rate changes on cash and cash equivalents	10			—			3,992			—			4,002
Net (decrease) increase in cash and cash equivalents	(48,783		)	—			116,634			—			67,851
Cash and cash equivalents at beginning of period	552,699			—			776,488			—			1,329,187
Cash and cash equivalents at end of period	$	503,916		$	—		$	893,122		$	—		$	1,397,038

Statement of cash flows for the three months ended March 31, 2016:



	IAC			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Eliminations			IAC Consolidated
	(In thousands)
Net cash (used in) provided by operating activities	$	(47,909	)	$	53,257		$	34,013		$	—		$	39,361
Cash flows from investing activities:
Acquisitions, net of cash acquired	—			—			(2,252		)	—			(2,252		)
Capital expenditures	(281		)	(7,372		)	(8,437		)	—			(16,090		)
Investments in time deposits	—			—			(87,500		)	—			(87,500		)
Purchases of marketable debt securities	(66,891		)	—			—			—			(66,891		)
Purchases of investments	—			—			(813		)	—			(813		)
Net proceeds from the sale of businesses and investments	10,000			—			83,097			—			93,097
Intercompany	(18,630		)	—			—			18,630			—
Other, net	—			155			4,225			—			4,380
Net cash used in investing activities	(75,802		)	(7,217		)	(11,680		)	18,630			(76,069		)
Cash flows from financing activities:
Purchase of treasury stock	(135,938		)	—			—			—			(135,938		)
Principal payment on Match Group Term Loan	—			—			(10,000		)	—			(10,000		)
Repurchases of Senior Notes	(32,912		)	—			—			—			(32,912		)
Issuance of IAC common stock pursuant to stock-based awards, net of withholding taxes	(14,919		)	—			—			—			(14,919		)
Issuance of Match Group common stock pursuant to stock-based awards, net of withholding taxes	—			—			(4,453		)	—			(4,453		)
Purchase of noncontrolling interests	(1,400		)	—			—			—			(1,400		)
Acquisition-related contingent consideration payments	—			(312		)	—			—			(312		)
Intercompany	45,728			(45,728		)	18,630			(18,630		)	—
Other, net	(5,000		)	—			(856		)	—			(5,856		)
Net cash (used in) provided by financing activities	(144,441		)	(46,040		)	3,321			(18,630		)	(205,790		)
Total cash (used in) provided by	(268,152		)	—			25,654			—			(242,498		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(285		)	—			(285		)
Net (decrease) increase in cash and cash equivalents	(268,152		)	—			25,369			—			(242,783		)
Cash and cash equivalents at beginning of period	1,073,053			—			408,394			—			1,481,447
Cash and cash equivalents at end of period	$	804,901		$	—		$	433,763		$	—		$	1,238,664

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Revenue [Line Items]
Revenue	$ 760,833	$ 819,179
Accounts receivable, net	218,504		$ 220,138
Operating segments \| Applications
Revenue [Line Items]
Revenue	158,897	159,796
Operating segments \| Publishing
Revenue [Line Items]
Revenue	78,080	166,002
Google Inc.
Revenue [Line Items]
Accounts receivable, net	65,500		$ 65,800
Google Inc. \| Publishing And Applications
Revenue [Line Items]
Revenue	$ 187,800	$ 284,600
Google Inc. \| Revenue \| Customer concentration risk
Revenue [Line Items]
Concentration risk (percentage)	25.00%	35.00%
Google Inc. \| Revenue \| Operating segments \| Customer concentration risk \| Applications
Revenue [Line Items]
Concentration risk (percentage)	84.00%	91.00%
Google Inc. \| Revenue \| Operating segments \| Customer concentration risk \| Publishing
Revenue [Line Items]
Concentration risk (percentage)	70.00%	83.00%

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently Adopted Standards (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefit generated by settlement or exercise of stock-based awards	$ 26.8
ASU No. 2016-15 \| New Accounting Pronouncement, Early Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contingent consideration payments in excess of liability recognized on acquisition date in operating activities	$ 11.1
ASU No. 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in diluted shares as a result of adoption of new accounting standard (in shares)	1.3
ASU No. 2016-09 \| Reclassification adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefit generated by settlement or exercise of stock-based awards		$ 15.3

INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended
INCOME TAXES (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax benefit (provision)	$ 23,909	$ (1,520)
Excess tax benefit generated by settlement or exercise of stock-based awards	26,800
Effective tax rate (as a percent)		(16.00%)
Federal statutory rate (as a percent)		35.00%
Accrued interest on unrecognized tax benefits	2,700		$ 2,600
Accrued penalties on unrecognized tax benefits	1,600		1,700
Total unrecognized tax benefits including interest and penalties	40,100		41,000
Unrecognized tax benefit, if subsequently recognized would reduce income tax expense	36,900		$ 37,700
Decrease in unrecognized tax benefit, reasonably possible within twelve months	11,800
Decrease in unrecognized tax benefit which would reduce the income tax provision	$ 11,100

MARKETABLE SECURITIES - Schedule of Current Available-For-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 33,997	$ 89,350
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(5)	(10)
Fair Value	33,992	89,342
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,949	49,797
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	21,949	49,797
Treasury discount notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,995	34,978
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	(4)
Fair Value	9,993	34,974
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,053	4,575
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(3)	(6)
Fair Value	2,050	4,571
Total debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	33,997	89,350
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(5)	(10)
Fair Value	$ 33,992	$ 89,342

MARKETABLE SECURITIES (Details)	3 Months Ended
MARKETABLE SECURITIES (Details)	Mar. 31, 2017 USD ($) investment	Mar. 31, 2016 USD ($)
Marketable Securities [Abstract]
Aggregate fair value of available-for-sale securities with unrealized losses	$ 12,000,000
Number of current available-for-sale marketable debt securities in continuous unrealized loss position for greater than twelve months \| investment	0
Gross realized gains or (losses)	$ 0	$ 0

MARKETABLE SECURITIES - Schedule of Proceeds From Maturities and Sales of Available-For-Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Marketable Securities [Abstract]
Proceeds from maturities and sales of available-for-sale marketable securities	$ 75,350	$ 10,000

FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets:
Marketable securities	$ 33,992	$ 89,342
Fair Value on a Recurring Basis
Assets:
Total	1,053,429	984,635
Liabilities:
Contingent consideration arrangements	(21,821)	(33,871)
Fair Value on a Recurring Basis \| Money market funds
Assets:
Cash equivalents	689,129	667,662
Fair Value on a Recurring Basis \| Commercial paper
Assets:
Cash equivalents	149,940	123,640
Fair Value on a Recurring Basis \| Time deposits
Assets:
Cash equivalents	105,397	79,000
Fair Value on a Recurring Basis \| Treasury discount notes
Assets:
Cash equivalents	74,971	24,991
Marketable securities	9,993	34,974
Fair Value on a Recurring Basis \| Commercial paper
Assets:
Marketable securities	21,949	49,797
Fair Value on a Recurring Basis \| Corporate debt securities
Assets:
Marketable securities	2,050	4,571
Fair Value on a Recurring Basis \| Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total	774,093	727,627
Liabilities:
Contingent consideration arrangements	0	0
Fair Value on a Recurring Basis \| Quoted Market Prices in Active Markets for Identical Assets (Level 1) \| Money market funds
Assets:
Cash equivalents	689,129	667,662
Fair Value on a Recurring Basis \| Quoted Market Prices in Active Markets for Identical Assets (Level 1) \| Commercial paper
Assets:
Cash equivalents	0	0
Fair Value on a Recurring Basis \| Quoted Market Prices in Active Markets for Identical Assets (Level 1) \| Time deposits
Assets:
Cash equivalents	0	0
Fair Value on a Recurring Basis \| Quoted Market Prices in Active Markets for Identical Assets (Level 1) \| Treasury discount notes
Assets:
Cash equivalents	74,971	24,991
Marketable securities	9,993	34,974
Fair Value on a Recurring Basis \| Quoted Market Prices in Active Markets for Identical Assets (Level 1) \| Commercial paper
Assets:
Marketable securities	0	0
Fair Value on a Recurring Basis \| Quoted Market Prices in Active Markets for Identical Assets (Level 1) \| Corporate debt securities
Assets:
Marketable securities	0	0
Fair Value on a Recurring Basis \| Significant Other Observable Inputs (Level 2)
Assets:
Total	279,336	257,008
Liabilities:
Contingent consideration arrangements	0	0
Fair Value on a Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Money market funds
Assets:
Cash equivalents	0	0
Fair Value on a Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Commercial paper
Assets:
Cash equivalents	149,940	123,640
Fair Value on a Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Time deposits
Assets:
Cash equivalents	105,397	79,000
Fair Value on a Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Treasury discount notes
Assets:
Cash equivalents	0	0
Marketable securities	0	0
Fair Value on a Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Commercial paper
Assets:
Marketable securities	21,949	49,797
Fair Value on a Recurring Basis \| Significant Other Observable Inputs (Level 2) \| Corporate debt securities
Assets:
Marketable securities	2,050	4,571
Fair Value on a Recurring Basis \| Significant Unobservable Inputs (Level 3)
Assets:
Total	0	0
Liabilities:
Contingent consideration arrangements	(21,821)	(33,871)
Fair Value on a Recurring Basis \| Significant Unobservable Inputs (Level 3) \| Money market funds
Assets:
Cash equivalents	0	0
Fair Value on a Recurring Basis \| Significant Unobservable Inputs (Level 3) \| Commercial paper
Assets:
Cash equivalents	0	0
Fair Value on a Recurring Basis \| Significant Unobservable Inputs (Level 3) \| Time deposits
Assets:
Cash equivalents	0	0
Fair Value on a Recurring Basis \| Significant Unobservable Inputs (Level 3) \| Treasury discount notes
Assets:
Cash equivalents	0	0
Marketable securities	0	0
Fair Value on a Recurring Basis \| Significant Unobservable Inputs (Level 3) \| Commercial paper
Assets:
Marketable securities	0	0
Fair Value on a Recurring Basis \| Significant Unobservable Inputs (Level 3) \| Corporate debt securities
Assets:
Marketable securities	$ 0	$ 0

FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Schedule of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Contingent Consideration Arrangements
Contingent Consideration Arrangements
Balance at beginning of period	$ (33,871)	$ (33,873)
Fair value adjustments	(1,891)	(3,669)
Included in other comprehensive (loss) income	(1,059)	(1,906)
Fair value at date of acquisition	0	(185)
Settlements	15,000	312
Proceeds from sale	0	0
Other	0	2,078
Balance at end of period	$ (21,821)	(37,243)
Auction Rate Security
Auction Rate Security
Balance at beginning of period		4,050
Fair value adjustments		0
Included in other comprehensive (loss) income		5,950
Fair value at date of acquisition		0
Settlements		0
Proceeds from sale		(10,000)
Other		0
Balance at end of period		$ 0

FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($) arrangement	Dec. 31, 2016 USD ($)
Contingent Consideration Arrangements
Number of contingent consideration arrangements related to business acquisitions \| arrangement	5
Contingent consideration, maximum amount at balance sheet date	$ 121.1
Contingent consideration, fair value at balance sheet date with a maximum limit	21.8
Contingent consideration, at fair value, current	21.4	$ 33.4
Contingent consideration, at fair value, noncurrent	0.5	0.4
Assets measured at fair value on a nonrecurring basis
Cost method investments	$ 112.7	$ 116.1
Contingent Consideration Arrangements
Contingent Consideration Arrangements
Contingent consideration, discount rates	12.00%	12.00%

FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current portion of long-term debt	$ (5,000)	$ (20,000)
Long-term debt, net of current portion	1,571,982	1,582,484
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current portion of long-term debt	(5,000)	(20,000)
Long-term debt, net of current portion	1,571,982	1,582,484
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current portion of long-term debt	(5,264)	(20,311)
Long-term debt, net of current portion	$ 1,655,064	$ 1,657,861

LONG-TERM DEBT - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Dec. 08, 2016
Debt Instrument [Line Items]
Less: Current portion of long-term debt	$ 5,000	$ 20,000
Long-term debt, net of current portion	$ 1,571,982	1,582,484
Senior Notes \| 6.75% Senior Notes due December 15, 2022 (the 2015 Match Group Senior Notes); interest payable each June 15 and December 15, which commenced June 15, 2016
Debt Instrument [Line Items]
Stated interest rate (as a percent)	6.75%
Senior Notes \| 6.375% Senior Notes due June 1, 2024 (the 2016 Match Group Senior Notes); interest payable each June 1 and December 1, which commences December 1, 2016
Debt Instrument [Line Items]
Stated interest rate (as a percent)	6.375%
Senior Notes \| 4.875% Senior Notes due November 30, 2018 (the 2013 Senior Notes); interest payable each May 30 and November 30, which commenced May 30, 2014
Debt Instrument [Line Items]
Stated interest rate (as a percent)	4.875%
Senior Notes \| 4.75% Senior Notes due December 15, 2022 (the 2012 Senior Notes); interest payable each June 15 and December 15, which commenced June 15, 2013
Debt Instrument [Line Items]
Stated interest rate (as a percent)	4.75%
Match Group, Inc.
Debt Instrument [Line Items]
Long-term debt	$ 1,195,172	1,195,172
Less: Unamortized original issue discount and original issue premium, net	5,023	5,245
Less: Unamortized debt issuance costs	12,908	13,434
Long-term debt, net of current portion	1,177,241	1,176,493
Match Group, Inc. \| Senior Notes \| 6.75% Senior Notes due December 15, 2022 (the 2015 Match Group Senior Notes); interest payable each June 15 and December 15, which commenced June 15, 2016
Debt Instrument [Line Items]
Long-term debt	445,172	445,172
Match Group, Inc. \| Senior Notes \| 6.375% Senior Notes due June 1, 2024 (the 2016 Match Group Senior Notes); interest payable each June 1 and December 1, which commences December 1, 2016
Debt Instrument [Line Items]
Long-term debt	400,000	400,000
Match Group, Inc. \| Term Loan \| Match Group Term Loan due November 16, 2022
Debt Instrument [Line Items]
Long-term debt	$ 350,000	350,000	$ 350,000
Number of days prior to maturity date	91 days
IAC
Debt Instrument [Line Items]
Long-term debt	$ 401,733	428,323
Less: Current portion of long-term debt	5,000	20,000
Less: Unamortized debt issuance costs	1,992	2,332
Long-term debt, net of current portion	394,741	405,991
IAC \| Senior Notes \| 4.875% Senior Notes due November 30, 2018 (the 2013 Senior Notes); interest payable each May 30 and November 30, which commenced May 30, 2014
Debt Instrument [Line Items]
Long-term debt	366,874	390,214
IAC \| Senior Notes \| 4.75% Senior Notes due December 15, 2022 (the 2012 Senior Notes); interest payable each June 15 and December 15, which commenced June 15, 2013
Debt Instrument [Line Items]
Long-term debt	$ 34,859	$ 38,109

LONG-TERM DEBT (Details)				3 Months Ended
LONG-TERM DEBT (Details)	Dec. 08, 2016 USD ($)	Jun. 01, 2016 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Nov. 16, 2015 USD ($)
Debt Instrument [Line Items]
Repurchase and redemption of Senior Notes				$ 26,590,000	$ 32,912,000
Match Group, Inc.
Debt Instrument [Line Items]
Debt instrument, outstanding balance				1,195,172,000		$ 1,195,172,000
IAC
Debt Instrument [Line Items]
Debt instrument, outstanding balance				401,733,000		428,323,000
Repurchase and redemption of Senior Notes				26,590,000	32,912,000
Senior Notes \| 6.375% Senior Notes due June 1, 2024 (the 2016 Match Group Senior Notes); interest payable each June 1 and December 1, which commences December 1, 2016 \| Match Group, Inc.
Debt Instrument [Line Items]
Debt instrument, face amount		$ 400,000,000.0
Debt instrument, outstanding balance				$ 400,000,000		400,000,000
Senior Notes \| 6.375% Senior Notes due June 1, 2024 (the 2016 Match Group Senior Notes); interest payable each June 1 and December 1, which commences December 1, 2016 \| Maximum
Debt Instrument [Line Items]
Maximum leverage ratio				5.0
Senior Notes \| 6.75% Senior Notes due December 15, 2022 (the 2015 Match Group Senior Notes); interest payable each June 15 and December 15, which commenced June 15, 2016 \| Match Group, Inc.
Debt Instrument [Line Items]
Debt instrument, outstanding balance				$ 445,172,000		445,172,000
Senior Notes \| 4.875% Senior Notes due November 30, 2018 (the 2013 Senior Notes); interest payable each May 30 and November 30, which commenced May 30, 2014 \| IAC
Debt Instrument [Line Items]
Debt instrument, outstanding balance				366,874,000		390,214,000
Repurchase and redemption of Senior Notes				23,300,000	30,000,000
Senior Notes called For redemption				$ 5,000,000
Senior Notes \| 4.875% Senior Notes due November 30, 2018 (the 2013 Senior Notes); interest payable each May 30 and November 30, which commenced May 30, 2014 \| Maximum
Debt Instrument [Line Items]
Maximum leverage ratio				3.0
Senior Notes \| 4.75% Senior Notes due December 15, 2022 (the 2012 Senior Notes); interest payable each June 15 and December 15, which commenced June 15, 2013 \| IAC
Debt Instrument [Line Items]
Debt instrument, outstanding balance				$ 34,859,000		38,109,000
Repurchase and redemption of Senior Notes				3,300,000	$ 2,900,000
Term Loan \| Match Group Term Loan due November 16, 2022 \| Match Group, Inc.
Debt Instrument [Line Items]
Debt instrument, face amount							$ 800,000,000
Repayment of debt	$ 40,000,000	$ 400,000,000	$ 10,000,000
Debt instrument, outstanding balance	$ 350,000,000			$ 350,000,000		350,000,000
Debt instrument, interest rate				4.10%
Term Loan \| Match Group Term Loan due November 16, 2022 \| Base Rate \| Match Group, Inc.
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				2.25%
Term Loan \| Match Group Term Loan due November 16, 2022 \| LIBOR \| Match Group, Inc.
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				3.25%
Variable rate floor (as a percent)				0.75%
Revolving Credit Facility \| Match Group Credit Agreement \| Match Group, Inc.
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 500,000,000.0
Credit facility, borrowings outstanding				$ 0		0
Annual commitment fee on undrawn funds, basis points				0.30%
Revolving Credit Facility \| Match Group Credit Agreement \| Maximum \| Match Group, Inc.
Debt Instrument [Line Items]
Maximum leverage ratio				5.0
Revolving Credit Facility \| Match Group Credit Agreement \| Minimum \| Match Group, Inc.
Debt Instrument [Line Items]
Minimum interest coverage ratio				2.5
Revolving Credit Facility \| IAC Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 300,000,000
Credit facility, borrowings outstanding				$ 0		$ 0
Annual commitment fee on undrawn funds, basis points				0.35%
Revolving Credit Facility \| IAC Credit Facility \| Maximum
Debt Instrument [Line Items]
Maximum leverage ratio				3.25

ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 2,010,670,000
Other comprehensive income (loss) before reclassifications, net of tax benefit	18,064,000	$ 12,619,000
Amounts reclassified to earnings	714,000	7,389,000
Net currernt period other comprehensive income (loss)	18,778,000	20,008,000
Reallocation of accumulated other comprehensive loss (income) related to the noncontrolling interests created in the Match Group initial public offering		21,131,000
Ending balance	2,018,729,000
Tax benefit or provision on other comprehensive income	0
Other comprehensive income (loss), unrealized gains (losses) on available-for-sale securities, tax		300,000
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(170,149,000)	(154,645,000)
Other comprehensive income (loss) before reclassifications, net of tax benefit	18,062,000	7,182,000
Amounts reclassified to earnings	714,000	7,389,000
Net currernt period other comprehensive income (loss)	18,776,000	14,571,000
Reallocation of accumulated other comprehensive loss (income) related to the noncontrolling interests created in the Match Group initial public offering		21,589,000
Ending balance	(151,373,000)	(118,485,000)
Unrealized Gains On Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	4,026,000	2,542,000
Other comprehensive income (loss) before reclassifications, net of tax benefit	2,000	5,437,000
Amounts reclassified to earnings	0	0
Net currernt period other comprehensive income (loss)	2,000	5,437,000
Reallocation of accumulated other comprehensive loss (income) related to the noncontrolling interests created in the Match Group initial public offering		(458,000)
Ending balance	4,028,000	7,521,000
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(166,123,000)	(152,103,000)
Ending balance	$ (147,345,000)	$ (110,964,000)

EARNINGS PER SHARE - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator: Basic
Net earnings	$ 28,463	$ 7,934
Net (earnings) loss attributable to noncontrolling interests	(2,254)	348
Net earnings attributable to IAC shareholders	26,209	8,282
Numerator: Diluted
Net earnings	28,463	7,934
Net (earnings) loss attributable to noncontrolling interests	(2,254)	348
Impact from Match Group's dilutive securities	(2,430)	(514)
Net earnings attributable to IAC shareholders	$ 23,779	$ 7,768
Denominator: Basic
Weighted average basic shares outstanding (in shares)	78,193	82,027
Denominator: Diluted
Weighted average basic shares outstanding (in shares)	78,193	82,027
Dilutive securities including subsidiary denominated equity, stock options and RSUs (in shares)	4,311	2,798
Denominator for earnings per share-weighted average shares (in shares)	82,504	84,825
Earnings (loss) per share attributable to IAC shareholders: Basic
Basic earnings per share (in dollars per share)	$ 0.34	$ 0.10
Earnings (loss) per share attributable to IAC shareholders: Diluted
Diluted earnings per share (in dollars per share)	$ 0.29	$ 0.09

EARNINGS PER SHARE - Antidilutive Securities (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Subsidiary Denominated Equity, Stock Options, and RSUs
Anti-dilutive weighted average common shares
Potentially dilutive securities excluded from calculation of diluted earnings per share (in shares)	2.0	3.9
Market-based awards and PSUs
Anti-dilutive weighted average common shares
Potentially dilutive securities excluded from calculation of diluted earnings per share (in shares)	0.4	1.0

SEGMENT INFORMATION - Financial Data by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Revenue	$ 760,833	$ 819,179
Operating income (loss)	37,060	21,417
Adjusted EBITDA	101,976	85,886
Operating segments \| Match Group
Segment Reporting Information [Line Items]
Revenue	298,764	260,401
Operating income (loss)	58,871	34,186
Adjusted EBITDA	86,231	67,274
Operating segments \| HomeAdvisor
Segment Reporting Information [Line Items]
Revenue	150,745	111,489
Operating income (loss)	6,020	1,914
Adjusted EBITDA	11,073	4,966
Operating segments \| Video
Segment Reporting Information [Line Items]
Revenue	50,577	55,095
Operating income (loss)	(15,589)	(17,485)
Adjusted EBITDA	(14,732)	(16,901)
Operating segments \| Applications
Segment Reporting Information [Line Items]
Revenue	158,897	159,796
Operating income (loss)	32,768	27,678
Adjusted EBITDA	34,933	31,058
Operating segments \| Publishing
Segment Reporting Information [Line Items]
Revenue	78,080	166,002
Operating income (loss)	(5,788)	6,776
Adjusted EBITDA	1,179	11,414
Operating segments \| Other
Segment Reporting Information [Line Items]
Revenue	23,980	66,514
Operating income (loss)	(5,621)	(5,100)
Adjusted EBITDA	(1,532)	(1,629)
Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenue	(210)	(118)
Corporate
Segment Reporting Information [Line Items]
Operating income (loss)	(33,601)	(26,552)
Adjusted EBITDA	$ (15,176)	$ (10,296)

SEGMENT INFORMATION - Schedule of Geographic Information About Revenue and Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Revenue and long-lived assets by geography
Revenue	$ 760,833	$ 819,179
Long-lived assets (excluding goodwill and intangible assets)	291,721		$ 306,248
United States
Revenue and long-lived assets by geography
Revenue	548,598	604,491
Long-lived assets (excluding goodwill and intangible assets)	266,312		281,725
All Other Countries
Revenue and long-lived assets by geography
Revenue	212,235	$ 214,688
Long-lived assets (excluding goodwill and intangible assets)	$ 25,409		$ 24,523

SEGMENT INFORMATION - Schedule of Reconciliation of Operating Income (Loss) to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	$ 37,060	$ 21,417
Stock-Based Compensation Expense	33,975	31,185
Depreciation	19,888	15,795
Amortization of intangibles	9,161	13,820
Acquisition-related Contingent Consideration Fair Value Adjustments	1,892	3,669
Adjusted EBITDA	101,976	85,886
Interest expense	(24,792)	(27,860)
Other (expense) income, net	(7,714)	15,897
Earnings before income taxes	4,554	9,454
Income tax benefit (provision)	23,909	(1,520)
Net earnings	28,463	7,934
Net (earnings) loss attributable to noncontrolling interests	(2,254)	348
Net earnings attributable to IAC shareholders	26,209	8,282
Operating segments \| Match Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	58,871	34,186
Stock-Based Compensation Expense	18,024	17,448
Depreciation	7,589	5,751
Amortization of intangibles	403	6,728
Acquisition-related Contingent Consideration Fair Value Adjustments	1,344	3,161
Adjusted EBITDA	86,231	67,274
Operating segments \| HomeAdvisor
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	6,020	1,914
Stock-Based Compensation Expense	690	407
Depreciation	2,996	1,873
Amortization of intangibles	1,367	772
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0
Adjusted EBITDA	11,073	4,966
Operating segments \| Video
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	(15,589)	(17,485)
Stock-Based Compensation Expense	0	0
Depreciation	544	398
Amortization of intangibles	313	378
Acquisition-related Contingent Consideration Fair Value Adjustments	0	(192)
Adjusted EBITDA	(14,732)	(16,901)
Operating segments \| Applications
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	32,768	27,678
Stock-Based Compensation Expense	0	0
Depreciation	1,011	1,149
Amortization of intangibles	606	1,531
Acquisition-related Contingent Consideration Fair Value Adjustments	548	700
Adjusted EBITDA	34,933	31,058
Operating segments \| Publishing
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	(5,788)	6,776
Stock-Based Compensation Expense	0	0
Depreciation	2,019	2,189
Amortization of intangibles	4,948	2,449
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0
Adjusted EBITDA	1,179	11,414
Operating segments \| Other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	(5,621)	(5,100)
Stock-Based Compensation Expense	1,729	50
Depreciation	836	1,459
Amortization of intangibles	1,524	1,962
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0
Adjusted EBITDA	(1,532)	(1,629)
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	(33,601)	(26,552)
Stock-Based Compensation Expense	13,532	13,280
Depreciation	4,893	2,976
Amortization of intangibles	0	0
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0
Adjusted EBITDA	$ (15,176)	$ (10,296)

CONSOLIDATED FINANCIAL STATEMENT DETAILS (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Additional Consolidated Financial Statement Details [Line Items]
Other (expense) income, net	$ (7,714)	$ 15,897
IAC
Additional Consolidated Financial Statement Details [Line Items]
Other (expense) income, net	(5,805)	(9,985)
Other Income (Expense)
Additional Consolidated Financial Statement Details [Line Items]
Other-than-temporary impairment on cost method investments	3,400	2,300
Gain (loss) on mark-to-market adjustment related to a subsidiary denominated equity award issued to a non-employee	(2,700)	(1,200)
Foreign currency exchange gain (loss)	(2,600)	4,500
Interest income	$ 1,600	1,600
Gain on sale of long-term investments		1,200
Other Income (Expense) \| Senior Notes \| IAC
Additional Consolidated Financial Statement Details [Line Items]
Loss on redemption and repurchase of senior notes		(1,400)
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| PriceRunner
Additional Consolidated Financial Statement Details [Line Items]
Disposal group, revenue			$ 7,100
Disposal group, operating income			2,200
Disposal group, adjusted EBITDA			2,600
Amortization of intangible assets			300
Depreciation			$ 100
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| PriceRunner \| Other Income (Expense)
Additional Consolidated Financial Statement Details [Line Items]
Gain related to sale of business		$ 13,500

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 1,397,038	$ 1,329,187	$ 1,238,664	$ 1,481,447
Marketable securities	33,992	89,342
Accounts receivable, net	218,504	220,138
Other current assets	236,788	204,068
Intercompany receivables	0	0
Property and equipment, net	291,721	306,248
Goodwill	1,914,133	1,924,052
Intangible assets, net	326,704	355,451
Investment in subsidiaries	0	0
Other non-current assets	200,447	217,387
TOTAL ASSETS	4,619,327	4,645,873
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	5,000	20,000
Accounts payable, trade	83,003	62,863
Other current liabilities	591,392	630,525
Long-term debt, net of current portion	1,571,982	1,582,484
Income taxes payable	32,618	33,528
Intercompany liabilities	0	0
Other long-term liabilities	291,344	272,976
Redeemable noncontrolling interests	25,259	32,827
IAC shareholders' equity	1,848,059	1,869,222
Noncontrolling interests	170,670	141,448
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	4,619,327	4,645,873
IAC
ASSETS
Cash and cash equivalents	503,916	552,699	804,901	1,073,053
Marketable securities	33,992	89,342
Accounts receivable, net	0	0
Other current assets	87,682	71,152
Intercompany receivables	0	0
Property and equipment, net	3,938	4,350
Goodwill	0	0
Intangible assets, net	0	0
Investment in subsidiaries	3,683,127	3,659,570
Other non-current assets	50,955	52,228
TOTAL ASSETS	4,363,610	4,429,341
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	5,000	20,000
Accounts payable, trade	2,453	2,697
Other current liabilities	28,346	42,159
Long-term debt, net of current portion	394,741	405,991
Income taxes payable	0	0
Intercompany liabilities	1,774,593	1,782,865
Other long-term liabilities	310,418	306,407
Redeemable noncontrolling interests	0	0
IAC shareholders' equity	1,848,059	1,869,222
Noncontrolling interests	0	0
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	4,363,610	4,429,341
Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	0	0	0	0
Marketable securities	0	0
Accounts receivable, net	94,070	90,807
Other current assets	42,460	30,515
Intercompany receivables	774,949	735,108
Property and equipment, net	172,997	178,806
Goodwill	521,740	521,740
Intangible assets, net	78,094	83,179
Investment in subsidiaries	554,431	557,802
Other non-current assets	110,757	111,037
TOTAL ASSETS	2,349,498	2,308,994
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	0	0
Accounts payable, trade	38,311	38,283
Other current liabilities	121,370	120,279
Long-term debt, net of current portion	0	0
Income taxes payable	3,474	3,470
Intercompany liabilities	0	0
Other long-term liabilities	21,643	22,714
Redeemable noncontrolling interests	0	0
IAC shareholders' equity	2,164,700	2,124,248
Noncontrolling interests	0	0
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	2,349,498	2,308,994
Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	893,122	776,488	433,763	408,394
Marketable securities	0	0
Accounts receivable, net	124,434	129,331
Other current assets	106,646	102,401
Intercompany receivables	999,644	1,047,757
Property and equipment, net	114,786	123,092
Goodwill	1,392,393	1,402,312
Intangible assets, net	248,610	272,272
Investment in subsidiaries	0	0
Other non-current assets	146,786	169,595
TOTAL ASSETS	4,026,421	4,023,248
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	0	0
Accounts payable, trade	42,239	21,883
Other current liabilities	441,676	468,087
Long-term debt, net of current portion	1,177,241	1,176,493
Income taxes payable	29,310	30,274
Intercompany liabilities	0	0
Other long-term liabilities	67,168	59,112
Redeemable noncontrolling interests	25,259	32,827
IAC shareholders' equity	2,072,858	2,093,124
Noncontrolling interests	170,670	141,448
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	4,026,421	4,023,248
Eliminations
ASSETS
Cash and cash equivalents	0	0	$ 0	$ 0
Marketable securities	0	0
Accounts receivable, net	0	0
Other current assets	0	0
Intercompany receivables	(1,774,593)	(1,782,865)
Property and equipment, net	0	0
Goodwill	0	0
Intangible assets, net	0	0
Investment in subsidiaries	(4,237,558)	(4,217,372)
Other non-current assets	(108,051)	(115,473)
TOTAL ASSETS	(6,120,202)	(6,115,710)
LIABILITIES AND SHAREHOLDERS' EQUITY
Current portion of long-term debt	0	0
Accounts payable, trade	0	0
Other current liabilities	0	0
Long-term debt, net of current portion	0	0
Income taxes payable	(166)	(216)
Intercompany liabilities	(1,774,593)	(1,782,865)
Other long-term liabilities	(107,885)	(115,257)
Redeemable noncontrolling interests	0	0
IAC shareholders' equity	(4,237,558)	(4,217,372)
Noncontrolling interests	0	0
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ (6,120,202)	$ (6,115,710)

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Revenue	$ 760,833	$ 819,179
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	145,958	193,734
Selling and marketing expense	350,411	383,064
General and administrative expense	143,595	132,251
Product development expense	54,760	59,098
Depreciation	19,888	15,795
Amortization of intangibles	9,161	13,820
Total operating costs and expenses	723,773	797,762
Operating income	37,060	21,417
Equity in earnings (losses) of unconsolidated affiliates	0	0
Interest expense	(24,792)	(27,860)
Other (expense) income, net	(7,714)	15,897
Earnings before income taxes	4,554	9,454
Income tax benefit (provision)	23,909	(1,520)
Net earnings	28,463	7,934
Net (earnings) loss attributable to noncontrolling interests	(2,254)	348
Net earnings attributable to IAC shareholders	26,209	8,282
Comprehensive income attributable to IAC shareholders	44,987	28,290
IAC
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	113	212
Selling and marketing expense	326	889
General and administrative expense	26,136	18,972
Product development expense	570	1,379
Depreciation	438	437
Amortization of intangibles	0	0
Total operating costs and expenses	27,583	21,889
Operating income	(27,583)	(21,889)
Equity in earnings (losses) of unconsolidated affiliates	51,405	33,545
Interest expense	(5,828)	(7,418)
Other (expense) income, net	(5,805)	(9,985)
Earnings before income taxes	12,189	(5,747)
Income tax benefit (provision)	14,020	14,029
Net earnings	26,209	8,282
Net (earnings) loss attributable to noncontrolling interests	0	0
Net earnings attributable to IAC shareholders	26,209	8,282
Comprehensive income attributable to IAC shareholders	44,987	28,290
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue	309,136	384,510
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	34,758	72,817
Selling and marketing expense	175,268	209,946
General and administrative expense	39,235	38,345
Product development expense	18,871	24,770
Depreciation	9,208	6,972
Amortization of intangibles	5,085	1,986
Total operating costs and expenses	282,425	354,836
Operating income	26,711	29,674
Equity in earnings (losses) of unconsolidated affiliates	(2,400)	7,859
Interest expense	0	0
Other (expense) income, net	6,224	4,106
Earnings before income taxes	30,535	41,639
Income tax benefit (provision)	11,629	(13,216)
Net earnings	42,164	28,423
Net (earnings) loss attributable to noncontrolling interests	0	0
Net earnings attributable to IAC shareholders	42,164	28,423
Comprehensive income attributable to IAC shareholders	44,482	34,921
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenue	455,646	437,547
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	111,260	121,316
Selling and marketing expense	178,607	174,504
General and administrative expense	78,210	74,926
Product development expense	35,319	32,949
Depreciation	10,242	8,386
Amortization of intangibles	4,076	11,834
Total operating costs and expenses	417,714	423,915
Operating income	37,932	13,632
Equity in earnings (losses) of unconsolidated affiliates	0	0
Interest expense	(18,964)	(20,442)
Other (expense) income, net	(8,133)	21,776
Earnings before income taxes	10,835	14,966
Income tax benefit (provision)	(1,740)	(2,333)
Net earnings	9,095	12,633
Net (earnings) loss attributable to noncontrolling interests	(2,254)	348
Net earnings attributable to IAC shareholders	6,841	12,981
Comprehensive income attributable to IAC shareholders	29,272	28,704
Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenue	(3,949)	(2,878)
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	(173)	(611)
Selling and marketing expense	(3,790)	(2,275)
General and administrative expense	14	8
Product development expense	0	0
Depreciation	0	0
Amortization of intangibles	0	0
Total operating costs and expenses	(3,949)	(2,878)
Operating income	0	0
Equity in earnings (losses) of unconsolidated affiliates	(49,005)	(41,404)
Interest expense	0	0
Other (expense) income, net	0	0
Earnings before income taxes	(49,005)	(41,404)
Income tax benefit (provision)	0	0
Net earnings	(49,005)	(41,404)
Net (earnings) loss attributable to noncontrolling interests	0	0
Net earnings attributable to IAC shareholders	(49,005)	(41,404)
Comprehensive income attributable to IAC shareholders	$ (73,754)	$ (63,625)

GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ 67,805	$ 39,361
Cash flows from investing activities:
Acquisitions, net of cash acquired	(52,365)	(2,252)
Capital expenditures	(11,157)	(16,090)
Investments in time deposits	0	(87,500)
Proceeds from maturities and sales of marketable debt securities	75,350	0
Purchases of marketable debt securities	(19,926)	(66,891)
Purchases of investments	(29)	(813)
Net proceeds from the sale of businesses and investments	97,496	93,097
Intercompany	0	0
Other, net	213	4,380
Net cash provided by (used in) investing activities	89,582	(76,069)
Cash flows from financing activities:
Purchase of treasury stock	(56,424)	(135,938)
Principal payment on Match Group Term Loan	0	(10,000)
Repurchases of Senior Notes	(26,590)	(32,912)
Issuance of IAC common stock pursuant to stock-based awards, net of withholding taxes	(25,327)	(14,919)
Issuance of Match Group common stock pursuant to stock-based awards, net of withholding taxes	5,030	(4,453)
Purchase of noncontrolling interests	(12,259)	(1,400)
Acquisition-related contingent consideration payments	(3,860)	(312)
Funds returned from escrow for MyHammer tender offer	10,604	0
Intercompany	0	0
Other, net	15,288	(5,856)
Net cash used in financing activities	(93,538)	(205,790)
Total cash provided by (used in)	63,849	(242,498)
Effect of exchange rate changes on cash and cash equivalents	4,002	(285)
Net increase (decrease) in cash and cash equivalents	67,851	(242,783)
Cash and cash equivalents at beginning of period	1,329,187	1,481,447
Cash and cash equivalents at end of period	1,397,038	1,238,664
IAC
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(18,973)	(47,909)
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	0
Capital expenditures	(87)	(281)
Investments in time deposits		0
Proceeds from maturities and sales of marketable debt securities	75,350
Purchases of marketable debt securities	(19,926)	(66,891)
Purchases of investments	0	0
Net proceeds from the sale of businesses and investments	0	10,000
Intercompany	(5,295)	(18,630)
Other, net	0	0
Net cash provided by (used in) investing activities	50,042	(75,802)
Cash flows from financing activities:
Purchase of treasury stock	(56,424)	(135,938)
Principal payment on Match Group Term Loan		0
Repurchases of Senior Notes	(26,590)	(32,912)
Issuance of IAC common stock pursuant to stock-based awards, net of withholding taxes	(25,327)	(14,919)
Issuance of Match Group common stock pursuant to stock-based awards, net of withholding taxes	0	0
Purchase of noncontrolling interests	0	(1,400)
Acquisition-related contingent consideration payments	0	0
Funds returned from escrow for MyHammer tender offer	0
Intercompany	13,191	45,728
Other, net	15,288	(5,000)
Net cash used in financing activities	(79,862)	(144,441)
Total cash provided by (used in)	(48,793)	(268,152)
Effect of exchange rate changes on cash and cash equivalents	10	0
Net increase (decrease) in cash and cash equivalents	(48,783)	(268,152)
Cash and cash equivalents at beginning of period	552,699	1,073,053
Cash and cash equivalents at end of period	503,916	804,901
Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	28,369	53,257
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	0
Capital expenditures	(3,369)	(7,372)
Investments in time deposits		0
Proceeds from maturities and sales of marketable debt securities	0
Purchases of marketable debt securities	0	0
Purchases of investments	0	0
Net proceeds from the sale of businesses and investments	0	0
Intercompany	0	0
Other, net	31	155
Net cash provided by (used in) investing activities	(3,338)	(7,217)
Cash flows from financing activities:
Purchase of treasury stock	0	0
Principal payment on Match Group Term Loan		0
Repurchases of Senior Notes	0	0
Issuance of IAC common stock pursuant to stock-based awards, net of withholding taxes	0	0
Issuance of Match Group common stock pursuant to stock-based awards, net of withholding taxes	0	0
Purchase of noncontrolling interests	(11,840)	0
Acquisition-related contingent consideration payments	0	(312)
Funds returned from escrow for MyHammer tender offer	0
Intercompany	(13,191)	(45,728)
Other, net	0	0
Net cash used in financing activities	(25,031)	(46,040)
Total cash provided by (used in)	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Non-Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	58,409	34,013
Cash flows from investing activities:
Acquisitions, net of cash acquired	(52,365)	(2,252)
Capital expenditures	(7,701)	(8,437)
Investments in time deposits		(87,500)
Proceeds from maturities and sales of marketable debt securities	0
Purchases of marketable debt securities	0	0
Purchases of investments	(29)	(813)
Net proceeds from the sale of businesses and investments	97,496	83,097
Intercompany	0	0
Other, net	182	4,225
Net cash provided by (used in) investing activities	37,583	(11,680)
Cash flows from financing activities:
Purchase of treasury stock	0	0
Principal payment on Match Group Term Loan		(10,000)
Repurchases of Senior Notes	0	0
Issuance of IAC common stock pursuant to stock-based awards, net of withholding taxes	0	0
Issuance of Match Group common stock pursuant to stock-based awards, net of withholding taxes	5,030	(4,453)
Purchase of noncontrolling interests	(419)	0
Acquisition-related contingent consideration payments	(3,860)	0
Funds returned from escrow for MyHammer tender offer	10,604
Intercompany	5,295	18,630
Other, net	0	(856)
Net cash used in financing activities	16,650	3,321
Total cash provided by (used in)	112,642	25,654
Effect of exchange rate changes on cash and cash equivalents	3,992	(285)
Net increase (decrease) in cash and cash equivalents	116,634	25,369
Cash and cash equivalents at beginning of period	776,488	408,394
Cash and cash equivalents at end of period	893,122	433,763
Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	0	0
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	0
Capital expenditures	0	0
Investments in time deposits		0
Proceeds from maturities and sales of marketable debt securities	0
Purchases of marketable debt securities	0	0
Purchases of investments	0	0
Net proceeds from the sale of businesses and investments	0	0
Intercompany	5,295	18,630
Other, net	0	0
Net cash provided by (used in) investing activities	5,295	18,630
Cash flows from financing activities:
Purchase of treasury stock	0	0
Principal payment on Match Group Term Loan		0
Repurchases of Senior Notes	0	0
Issuance of IAC common stock pursuant to stock-based awards, net of withholding taxes	0	0
Issuance of Match Group common stock pursuant to stock-based awards, net of withholding taxes	0	0
Purchase of noncontrolling interests	0	0
Acquisition-related contingent consideration payments	0	0
Funds returned from escrow for MyHammer tender offer	0
Intercompany	(5,295)	(18,630)
Other, net	0	0
Net cash used in financing activities	(5,295)	(18,630)
Total cash provided by (used in)	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$ 0	$ 0

SUBSEQUENT EVENT (Details) - Subsequent Event	May 01, 2017
Minimum
Subsequent Event [Line Items]
Future ownership interest in new company based on definitive agreement	87.00%
Maximum
Subsequent Event [Line Items]
Future ownership interest in new company based on definitive agreement	90.00%