Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 37,260	$ 28,423	$ 48,341
Other comprehensive income (loss), net of taxes:
Foreign currency translation gain (loss), net of taxes	(3,332)	10,088	(7,997)
Unrealized gain (loss) on net investment hedge, net of taxes	(1,118)
Unrealized actuarial gain (loss) related to pension liability, net of taxes	(263)	428	(204)
Unrealized gain (loss) on cash flow hedging instruments, net of taxes	(1,965)	(132)	(2,584)
Unrealized gain (loss) on postretirement obligation, net of taxes	(181)	36	113
Other comprehensive income (loss), net of taxes	(6,859)	10,420	(10,672)
Comprehensive income (loss)	$ 30,401	$ 38,843	$ 37,669