CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net earnings (loss)	$ 757,747	$ 358,008	$ (16,151)
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities:
Stock-based compensation expense	238,420	264,618	104,820
Amortization of intangibles	108,399	42,143	79,426
Depreciation	75,360	74,265	71,676
Bad debt expense	48,445	28,930	17,733
Goodwill impairment	0	0	275,367
Deferred income taxes	(34,679)	(285,278)	(119,181)
Unrealized gains on equity securities, net	(124,170)	0	0
Gains from the sale of businesses and investments, net	(147,829)	(32,673)	(50,965)
Other adjustments, net	15,763	61,647	596
Changes in assets and liabilities, net of effects of acquisitions and dispositions:
Accounts receivable	(34,828)	(115,169)	1,283
Other assets	(44,557)	5,688	(12,808)
Accounts payable and other liabilities	53,555	(25,289)	(52,359)
Income taxes payable and receivable	27,034	655	8,998
Deferred revenue	49,468	39,154	35,803
Net cash provided by operating activities	988,128	416,699	344,238
Cash flows from investing activities:
Acquisitions, net of cash acquired	(64,496)	(146,553)	(18,403)
Capital expenditures	(85,634)	(75,523)	(78,039)
Proceeds from maturities and sales of marketable debt securities	333,600	114,350	252,369
Purchases of marketable debt securities	(449,676)	(29,891)	(313,943)
Investments in time deposits	0	0	(87,500)
Proceeds from maturities of time deposits	0	0	87,500
Net proceeds from the sale of businesses and investments	136,719	185,778	172,228
Purchases of investments	(52,980)	(9,106)	(12,565)
Other, net	9,027	2,994	11,215
Net cash (used in) provided by investing activities	(173,440)	42,049	12,862
Cash flows from financing activities:
Purchase of exchangeable note hedge	0	(74,365)	0
Proceeds from issuance of warrants	0	23,650	0
Debt issuance costs	(5,449)	(33,744)	(7,811)
Dividends paid to Match Group noncontrolling interests	(105,126)	0	0
Purchase of noncontrolling interests	(16,063)	(15,439)	(2,740)
Acquisition-related contingent consideration payments	(185)	(27,289)	(2,180)
Other, net	(5,375)	(5,000)	(2,705)
Net cash used in financing activities	(312,798)	(196,869)	(492,140)
Total cash provided (used)	501,890	261,879	(135,040)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(1,887)	11,604	(6,434)
Net increase (decrease) in cash, cash equivalents, and restricted cash	500,003	273,483	(141,474)
Cash, cash equivalents, and restricted cash at beginning of period	1,633,682	1,360,199	1,501,673
Cash, cash equivalents, and restricted cash at end of period	2,133,685	1,633,682	1,360,199
IAC/InterActiveCorp
Cash flows from financing activities:
Proceeds from issuance of debt	0	517,500	0
Repurchases of IAC debt	(363)	(393,464)	(126,409)
Purchase of treasury stock	(82,891)	(56,424)	(308,948)
Proceeds from the exercise of stock options	41,700	82,397	25,821
Withholding taxes paid on behalf of employees on net settled stock-based awards	(18,982)	(93,832)	(26,716)
Match Group and ANGI Homeservices
Cash flows from financing activities:
Proceeds from the exercise of stock options	4,705	61,095	39,378
Withholding taxes paid on behalf of employees on net settled stock-based awards	(237,564)	(264,323)	(29,830)
Match Group
Cash flows from financing activities:
Proceeds from issuance of debt	260,000	525,000	400,000
Principal payments on debt	0	(445,172)	(450,000)
Purchase of treasury stock	(133,455)	0	0
Proceeds from the exercise of stock options			39,378
Withholding taxes paid on behalf of employees on net settled stock-based awards			(29,830)
Purchase of Match Group stock-based awards	0	(272,459)	0
ANGI Homeservices
Cash flows from financing activities:
Principal payments on debt	$ (13,750)	0	$ 0
Borrowing under ANGI Homeservices Term Loan		$ 275,000