Consolidated Statements of Comprehensive Income (Loss) - 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 income (loss)	$ (1,383)	$ (327)	$ (2,484)	$ (149)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(368)	(7,169)	531	(1,641)
Retirement plans related adjustments	3,031	1,748	4,333	1,736
Unrealized gain (loss) on cash flow hedges	78	(751)	210	(433)
Other comprehensive income (loss) before tax	2,741	(6,172)	5,074	(338)
Income tax expense (benefit)	322	(506)	427	324
Other comprehensive income (loss), net of tax	2,419	(5,666)	4,647	(662)
Total comprehensive income (loss)	$ 1,036	$ (5,993)	$ 2,163	$ (811)