Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 17,762	$ (8,681)	$ 26,002
Other comprehensive income (loss)
Foreign currency translation adjustment	(27,622)	(13,318)	(9,292)
Pension liability, net of tax expense (benefit) of $113 in 2015, ($448) in 2014 and $605 in 2013	200	(797)	1,076
Total other comprehensive income (loss), net of tax	(27,422)	(14,115)	(8,216)
Comprehensive income (loss)	$ (9,660)	$ (22,796)	$ 17,786