Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other comprehensive income:
Foreign currency translation adjustment, tax	$ 114	$ 420	$ (650)
Net unrealized gains/(losses) on foreign currency cash flow hedges, tax	(325)	(869)	(1,470)
Reclassification adjustment for realized losses/(gains) in current earnings, tax	$ 756	$ 968	$ 1,842