Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 50,660	$ 20,846	$ 11,451
Other comprehensive income:
Foreign currency translation adjustment	(421)	(484)	1,552
Derivative and hedging activity, net of tax (expense) benefit of $5, $672, and ($271)	(4)	138	(1,074)
Pension and post-employment benefit adjustment, net of tax (expense) of ($4,741), ($13,300), and ($13,820)	13,197	45,049	(17,234)
Other comprehensive income (loss)	12,772	44,703	(16,756)
Comprehensive income (loss)	$ 63,432	$ 65,549	$ (5,305)