Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2,167	$ (9,376)	$ (4,681)	$ (18,717)
Other comprehensive income, net of tax:
Foreign currency translation adjustment	(1,070)	2,913	872	5,526
Defined benefit pension plan, net of tax:
Amortization of deferred loss, net of tax provision of $13 and $2 for the three months ended June 30, 2016 and 2015, respectively; net of tax provision of $25 and $4 for the six months ended June 30, 2016 and 2015, respectively	49	9	97	18
Amortization of prior service cost, net of tax provision of $8 and $7 for the three months ended June 30, 2016 and 2015, respectively; net of tax provision of $15 and $14 for the six months ended June 30, 2016 and 2015, respectively	30	29	60	57
Other comprehensive income (loss), net of tax	(991)	2,951	1,029	5,601
Comprehensive income (loss)	$ 1,176	$ (6,425)	$ (3,652)	$ (13,116)