Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 27,830	$ (1,569)	$ 86,599	$ (32,990)
Other comprehensive income (loss):
Net change in unrealized gain (loss) on derivatives	(1,980)	2,042	(5,923)	(5,224)
Tax effect	473	(673)	1,756	1,513
Net of tax	(1,507)	1,369	(4,167)	(3,711)
Foreign currency translation adjustment, net of tax	39,106	(1,805)	111,123	32,598
Total other comprehensive income (loss)	37,599	(436)	106,956	28,887
Total comprehensive income (loss)	$ 65,429	$ (2,005)	$ 193,555	$ (4,103)