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