Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2,610	$ (2,140)	$ 9,927
Other comprehensive (loss) income:
Foreign currency translation adjustments	(4,598)	(11,893)	1,939
Retirement plans related adjustments	(5,945)	(26,163)	23,689
Unrealized (loss) gain on cash flow hedges	0	(281)	77
Other comprehensive (loss) income before tax	(10,543)	(38,337)	25,705
Income tax (benefit) expense	(631)	(955)	1,615
Other comprehensive (loss) income, net of tax	(9,912)	(37,382)	24,090
Total comprehensive (loss) income	$ (7,302)	$ (39,522)	$ 34,017