Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 121,887	$ 129,437	$ 143,086
Other comprehensive income:
Foreign currency translation adjustment, net of taxes of $2,275, $(8,056), and $2,483 respectively	(13,474)	18,264	(13,127)
Net unrealized gains/(losses) on foreign currency cash flow hedges, net of taxes of $18, $84 and $784, respectively	(160)	(152)	(1,423)
Less: Reclassification adjustment for realized losses/(gains) in current earnings, net of taxes of $(2), $169, and $(935), respectively	18	(308)	1,697
Total other comprehensive income (loss)	(13,616)	17,804	(12,853)
Comprehensive income	$ 108,271	$ 147,241	$ 130,233