Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 4,113	$ (141,660)	$ (44,445)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment		6,024	(5,896)	(6,947)
Unrealized gain (loss) on cash flow hedges, net of tax (benefit) of $0, ($54), and ($76)		426	(83)	(121)
Pension and post-retirement benefit plans benefit (expense), net of tax expense (benefit): $159, ($491), and $208		920	(1,671)	631
Reclassification of pension liability adjustments to earnings, net of tax expense of $5, $135, and $160	[1]	152	301	389
Other comprehensive income (loss)		7,522	(7,349)	(6,048)
Comprehensive income (loss)		$ 11,635	$ (149,009)	$ (50,493)

[1] Reclassifications out of accumulated other comprehensive income for pension obligations are charged to selling and administrative expense.