Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 68,597	$ 57,791	$ 37,260
Other comprehensive income (loss), net of taxes:
Foreign currency translation gain (loss), net of taxes	(36,525)	(34,827)	(3,332)
Unrealized gain (loss) on net investment hedges, net of taxes	3,894	3,959	(1,118)
Unrealized actuarial gain (loss) related to pension liability, net of taxes	21	(142)	(263)
Unrealized gain (loss) on cash flow hedging instruments, net of taxes	(416)	2,424	(1,965)
Unrealized gain (loss) on postretirement obligation, net of taxes	(75)	28	(181)
Other comprehensive income (loss), net of taxes	(33,101)	(28,558)	(6,859)
Comprehensive income (loss)	$ 35,496	$ 29,233	$ 30,401