Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Equity [Abstract]
Net income (loss)	$ 6,850			$ 6,970			$ (14,623)	$ 13,686
Foreign currency translation adjustments	4,617			(4,770)			(790)	(4,240)
Pension liability, net of income tax	535			546			1,605	1,639
Cash flow hedging gain (loss), net of income tax	(3,026)			1,915			(3,050)	423
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	8,976	$ (24,713)	$ (1,121)	4,661	$ 5,751	$ 1,096	(16,858)	11,508
Pension liability, tax	170			174			510	521
Cash flow hedging gain (loss), tax	$ (964)			$ 610			$ (972)	$ 135