Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Consolidated Statements of Comprehensive Loss
Net Loss	$ (29,907)	$ (23,994)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	3,392	(268)
Unrealized pension actuarial gains (losses), net of tax	(224)	(403)
Total other comprehensive loss, net of tax	$ (26,739)	$ (24,665)