CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue	$ 1,186,658	$ 1,059,122	$ 2,292,501	$ 2,054,197
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	276,389	218,224	536,460	420,186
Selling and marketing expense	411,102	369,660	832,962	772,492
General and administrative expense	225,514	188,363	439,130	372,547
Product development expense	78,614	75,445	167,314	152,382
Depreciation	21,091	18,805	40,062	38,062
Amortization of intangibles	19,638	20,188	42,390	40,141
Total operating costs and expenses	1,032,348	890,685	2,058,318	1,795,810
Operating income	154,310	168,437	234,183	258,387
Interest expense	(37,206)	(27,356)	(68,349)	(53,861)
Other income, net	45,972	171,141	46,623	166,522
Earnings before income taxes	163,076	312,222	212,457	371,048
Income tax (provision) benefit	(16,285)	(31,368)	47,319	(2,355)
Net earnings	146,791	280,854	259,776	368,693
Net earnings attributable to noncontrolling interests	(33,324)	(62,501)	(57,614)	(79,258)
Net earnings attributable to IAC shareholders	$ 113,467	$ 218,353	$ 202,162	$ 289,435
Earnings per share attributable to IAC shareholders:
Basic earnings per share (USD per share)	$ 1.35	$ 2.61	$ 2.41	$ 3.47
Diluted earnings per share (USD per share)	$ 1.19	$ 2.32	$ 2.10	$ 3.05
Stock-based compensation expense by function:
Stock-based compensation expense	$ 62,425	$ 57,561	$ 129,869	$ 116,643
Cost of revenue
Stock-based compensation expense by function:
Stock-based compensation expense	695	715	1,984	1,425
Selling and marketing expense
Stock-based compensation expense by function:
Stock-based compensation expense	2,760	2,077	5,477	3,842
General and administrative expense
Stock-based compensation expense by function:
Stock-based compensation expense	49,949	44,875	94,959	90,501
Product development expense
Stock-based compensation expense by function:
Stock-based compensation expense	$ 9,021	$ 9,894	$ 27,449	$ 20,875