Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Comprehensive (Loss) Income
Net (loss) income	$ (141,660)	$ (44,445)	$ 25,656
Other comprehensive loss, net of tax:
Foreign currency translation adjustment	(5,896)	(6,947)	(4,863)
Unrealized loss on cash flow hedges, net of tax expense (benefit) of ($54) and ($76)	(83)	(121)	0
Pension and post-retirement benefit plans benefit (expense), net of tax expense (benefit): ($491), $208, and ($1,383)	(1,671)	631	(2,631)
Reclassification of pension liability adjustments to earnings, net of tax expense of $135, $160 and $63	301	389	185
Other comprehensive loss, net of tax	(7,349)	(6,048)	(7,309)
Comprehensive (loss) income	$ (149,009)	$ (50,493)	$ 18,347