Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 133,046	$ 189,176	$ 364,888
Other comprehensive income:
Foreign currency translation adjustment, net of taxes of $(650), $420 and $114, respectively	(18,967)	(5,113)	6,251
Net unrealized gains/(losses) on foreign currency cash flow hedges, net of taxes of $(1,470), $(869) and $(325), respectively	590	1,578	2,650
Less: Reclassification adjustment for realized losses/(gains) in current earnings, net of taxes of $1,842, $968 and $756, respectively	(1,371)	(1,758)	(3,307)
Total other comprehensive income	(19,748)	(5,293)	5,594
Comprehensive income	$ 113,298	$ 183,883	$ 370,482