Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net income	$ 42,041	$ 44,713	$ 69,530	$ 48,029
Other comprehensive income, net of tax:
Foreign currency translation adjustment, net of taxes of $1,901 and $886 for the three months ended June 30, 2017 and 2016, respectively, and $(1,679) and $(1,565) for the six months ended June 30, 2017 and 2016, respectively	81	(3,639)	9,776	1,950
Net unrealized gains/(losses) on foreign currency cash flow hedges, net of taxes of $(114) and $645 for the three months ended June 30, 2017 and 2016, respectively, and $99 and $1,575 for the six months ended June 30, 2017 and 2016, respectively	207	(1,170)	(180)	(2,860)
Reclassification adjustment for realized losses/(gains) in current earnings, net of taxes of $143 and $(329) for the three months ended June 30, 2017 and 2016, respectively, and $120 and $(395) for the six months ended June 30, 2017 and 2016, respectively	(260)	597	(217)	716
Total other comprehensive income	28	(4,212)	9,379	(194)
Comprehensive income	$ 42,069	$ 40,501	$ 78,909	$ 47,835