Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 143,086	$ 133,046	$ 189,176
Other comprehensive income:
Foreign currency translation adjustment, net of taxes of $420, $114 and $2,483, respectively	(13,127)	(18,967)	(5,113)
Net unrealized gains/(losses) on foreign currency cash flow hedges, net of taxes of $(869), $(325) and $784, respectively	(1,423)	590	1,578
Less: Reclassification adjustment for realized losses/(gains) in current earnings, net of taxes of $968, $756 and $(935), respectively	1,697	(1,371)	(1,758)
Total other comprehensive income	(12,853)	(19,748)	(5,293)
Comprehensive income	$ 130,233	$ 113,298	$ 183,883