Unaudited Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (9,508)	$ (6,434)
Foreign currency translation adjustment	2,108	6,226
Foreign currency hedge	(166)	(553)
Amortization of net actuarial loss on defined benefit pension plans	17	0
Other comprehensive income, before tax	1,959	5,673
Tax provision attributable to other comprehensive income	(448)	(1,151)
Other comprehensive income, net of tax	1,511	4,522
Total comprehensive loss	$ (7,997)	$ (1,912)