CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue	$ 995,075	$ 760,833
Operating costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	201,962	145,958
Selling and marketing expense	402,832	350,411
General and administrative expense	184,184	143,595
Product development expense	76,937	54,760
Depreciation	19,257	19,888
Amortization of intangibles	19,953	9,161
Total operating costs and expenses	905,125	723,773
Operating income	89,950	37,060
Interest expense	(26,505)	(24,792)
Other expense, net	(4,619)	(7,714)
Earnings before income taxes	58,826	4,554
Income tax benefit	29,013	23,909
Net earnings	87,839	28,463
Net earnings attributable to noncontrolling interests	(16,757)	(2,254)
Net earnings attributable to IAC shareholders	$ 71,082	$ 26,209
Per share information attributable to IAC shareholders:
Basic earnings per share (USD per share)	$ 0.86	$ 0.34
Diluted earnings per share (USD per share)	$ 0.71	$ 0.29
Stock-based compensation expense by function:
Stock-based compensation expense	$ 59,082	$ 33,975
Cost of revenue
Stock-based compensation expense by function:
Stock-based compensation expense	710	502
Selling and marketing expense
Stock-based compensation expense by function:
Stock-based compensation expense	1,765	1,807
General and administrative expense
Stock-based compensation expense by function:
Stock-based compensation expense	45,626	26,940
Product development expense
Stock-based compensation expense by function:
Stock-based compensation expense	$ 10,981	$ 4,726