Consolidated Statements of Comprehensive Income (Loss) - 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)	$ 145	$ 1,586	$ (1,101)	$ 178
Other comprehensive (loss) income:
Foreign currency translation adjustments	(2,840)	4,196	899	5,528
Retirement plans related adjustments	1,575	(522)	1,302	(11)
Unrealized gain on cash flow hedges	(33)	(57)	132	318
Other comprehensive (loss) income before tax	(1,298)	3,617	2,333	5,835
Income tax expense (benefit)	282	(333)	105	831
Other comprehensive (loss) income, net of tax	(1,580)	3,950	2,228	5,004
Total comprehensive (loss) income	$ (1,435)	$ 5,536	$ 1,127	$ 5,182