Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net income	$ 44,090	$ 53,146	$ 133,441	$ 139,646
Other comprehensive income, net of tax:
Foreign currency translation adjustment, net of taxes of $(31) and $(346) for the three months ended September 30, 2019 and 2018, respectively, and $186 and $(51) for the nine months ended September 30, 2019 and 2018, respectively	(13,685)	(7,095)	(15,027)	(16,095)
Net unrealized gains/(losses) on foreign currency cash flow hedges, net of taxes of zero for the three months ended September 30, 2019 and 2018, and zero and $18 for the nine months ended September 30, 2019 and 2018, respectively	0	0	0	(160)
Reclassification adjustment for realized losses/(gains) in current earnings, net of taxes of zero for the three months ended September 30, 2019 and 2018, and zero and $(2) for the nine months ended September 30, 2019 and 2018, respectively	0	0	0	18
Other comprehensive income	(13,685)	(7,095)	(15,027)	(16,237)
Comprehensive income	$ 30,405	$ 46,051	$ 118,414	$ 123,409