Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 8,520	$ 12,583	$ 26,827	$ 35,631
Other comprehensive income (loss):
Foreign currency exchange translation adjustments	(3,388)	(1,529)	(3,048)	(5,363)
Minimum pension liability, net of tax	(2,095)	(1,060)	(1,008)	(1,992)
Derivative Instrument	(515)	0	(193)	0
Other comprehensive income (loss)	(5,998)	(2,589)	(4,249)	(7,355)
Comprehensive income	$ 2,522	$ 9,994	$ 22,578	$ 28,276