Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,224	$ 2,610	$ (2,140)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(4,811)	(4,598)	(11,893)
Retirement plans related adjustments	(899)	(5,945)	(26,163)
Unrealized gain (loss) on cash flow hedges	138	0	(281)
Other comprehensive loss before tax	(5,572)	(10,543)	(38,337)
Income tax expense (benefit)	371	(631)	(955)
Other comprehensive loss, net of tax	(5,943)	(9,912)	(37,382)
Total comprehensive loss	$ (4,719)	$ (7,302)	$ (39,522)