Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 20,846	$ 11,451	$ 25,740
Other comprehensive income:
Foreign currency translation adjustment	(484)	1,552	(172)
Derivative and hedging activity, net of tax benefit (expense) of $672, ($271), and ($149)	138	(1,074)	258
Pension and post-employment benefit adjustment, net of tax benefit (expense) of ($13,300), ($13,820), and $4,555	45,049	(17,234)	(5,562)
Other comprehensive income (loss)	44,703	(16,756)	(5,476)
Comprehensive income (loss)	$ 65,549	$ (5,305)	$ 20,264