Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (22,333)	$ (6,272)	$ 6,340
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	1,574	(10,445)	2,428
Defined benefit pension plan, net of tax:
Actuarial gain (loss) on benefit obligation and plan assets, net of tax benefit of $531 and $922, and tax provision of $597 for the years ended December 31, 2015, 2014 and 2013, respectively	(1,862)	(2,358)	2,785
Amortization of deferred loss, net of tax provision of $10 and $32 for the years ended December 31, 2015 and 2013, respectively	35	0	148
Amortization of prior service cost, net of tax provision of $30, $39 and $8 for the years ended December 31, 2015, 2014 and 2013, respectively	106	101	36
Settlements and plan changes, net of tax provision of $91 and $118, and tax benefit of $173 for the years ended December 31, 2015, 2014 and 2013, respectively	318	302	(805)
Other comprehensive income (loss), net of tax	171	(12,400)	4,592
Comprehensive income (loss)	$ (22,162)	$ (18,672)	$ 10,932