CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue	$ 1,059,122	$ 767,387	$ 2,054,197	$ 1,528,220
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	218,224	139,033	420,186	284,991
Selling and marketing expense	369,660	320,104	772,492	670,515
General and administrative expense	188,363	150,222	372,547	293,817
Product development expense	75,445	55,430	152,382	110,190
Depreciation	18,805	18,339	38,062	38,227
Amortization of intangibles	20,188	8,624	40,141	17,785
Total operating costs and expenses	890,685	691,752	1,795,810	1,415,525
Operating income	168,437	75,635	258,387	112,695
Interest expense	(27,356)	(24,728)	(53,861)	(49,520)
Other income, net	171,141	10,230	166,522	2,516
Earnings before income taxes	312,222	61,137	371,048	65,691
Income tax (provision) benefit	(31,368)	19,420	(2,355)	43,329
Net earnings	280,854	80,557	368,693	109,020
Net earnings attributable to noncontrolling interests	(62,501)	(14,289)	(79,258)	(16,543)
Net earnings attributable to IAC shareholders	$ 218,353	$ 66,268	$ 289,435	$ 92,477
Per share information attributable to IAC shareholders:
Basic earnings per share (USD per share)	$ 2.61	$ 0.84	$ 3.47	$ 1.18
Diluted earnings per share (USD per share)	$ 2.32	$ 0.70	$ 3.05	$ 0.99
Stock-based compensation expense by function:
Stock-based compensation expense	$ 57,561	$ 38,915	$ 116,643	$ 72,890
Cost of revenue
Stock-based compensation expense by function:
Stock-based compensation expense	715	473	1,425	975
Selling and marketing expense
Stock-based compensation expense by function:
Stock-based compensation expense	2,077	1,643	3,842	3,450
General and administrative expense
Stock-based compensation expense by function:
Stock-based compensation expense	44,875	31,751	90,501	58,691
Product development expense
Stock-based compensation expense by function:
Stock-based compensation expense	$ 9,894	$ 5,048	$ 20,875	$ 9,774