Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (6,855)	$ (1,449)	$ (11,536)	$ (20,166)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	685	(2,750)	1,557	2,776
Defined benefit pension plan, net of tax:
Amortization of deferred loss, net of tax provision of $12 and $2 for the three months ended September 30, 2016 and 2015, respectively; net of tax provision of $37 and $6 for the nine months ended September 30, 2016 and 2015, respectively	49	9	146	27
Amortization of prior service cost, net of tax provision of $8 and $7 for the three months ended September 30, 2016 and 2015, respectively; net of tax provision of $23 and $21 for the nine months ended September 30, 2016 and 2015, respectively	30	27	90	84
Other comprehensive income (loss), net of tax	764	(2,714)	1,793	2,887
Comprehensive loss	$ (6,091)	$ (4,163)	$ (9,743)	$ (17,279)