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CONSOLIDATED STATEMENT OF COMPREHENSIVE OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 87,839	$ 28,463
Other comprehensive income, net of tax:
Change in foreign currency translation adjustment	35,393	21,910
Change in unrealized gains and losses of available-for-sale securities (no tax benefit in 2017)	0	2
Total other comprehensive income	35,393	21,912
Comprehensive income, net of tax	123,232	50,375
Components of comprehensive income attributable to noncontrolling interests:
Net earnings attributable to noncontrolling interests	(16,757)	(2,254)
Change in foreign currency translation adjustment attributable to noncontrolling interests	(7,036)	(3,134)
Comprehensive income attributable to noncontrolling interests	(23,793)	(5,388)
Comprehensive income attributable to IAC shareholders	$ 99,439	$ 44,987

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