Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ (18,830)	$ (16,456)	$ (6,342)
Other comprehensive income (loss)		(9,611)	(3,249)	(10,488)
Amounts reclassified from other comprehensive income (loss)	[1]	726	875	374
Ending Balance		(27,715)	(18,830)	(16,456)
Cumulative translation adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(9,698)	(5,615)	1,353
Other comprehensive income (loss)		(7,524)	(4,083)	(6,968)
Ending Balance		(17,222)	(9,698)	(5,615)
Pension liability
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(9,132)	(10,841)	(7,695)
Other comprehensive income (loss)		(2,087)	834	(3,520)
Amounts reclassified from other comprehensive income (loss)	[1]	726	875	374
Ending Balance		$ (10,493)	$ (9,132)	$ (10,841)

[1] The amounts reclassified from other comprehensive income (loss) were included in selling, general and administrative expenses in the consolidated statements of operations.