Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (10,399)	$ (6,848)
Other comprehensive income, net of tax:
Foreign currency translation adjustment	1,312	1,942
Defined benefit pension plan, net of tax:
Amortization of deferred loss, net of tax provision of $12 for the three months ended March 31, 2016	0	48
Amortization of prior service cost, net of tax provision of $7 for each of the three months ended March 31, 2017 and 2016	29	30
Other comprehensive income, net of tax	1,341	2,020
Comprehensive loss	$ (9,058)	$ (4,828)