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	$ 34,944	$ 49,317	$ 37,187
Other comprehensive (loss) income:
Change in pension plans, net of income taxes of $1,285, $409, and $1,409, respectively	(4,204)	2,016	(2,400)
Foreign currency translation adjustments	(16,237)	25,664	(10,965)
Unrealized (loss) gain on hedging activities, net of tax	(2,096)	122	0
Total other comprehensive (loss) income, net of tax	(22,537)	27,802	(13,365)
Comprehensive income	$ 12,407	$ 77,119	$ 23,822