Restatement of Previously Issued Financial Statements - Statements of Comprehensive Income (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
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	$ (2,010)	$ 7,760	$ 21,512	$ (2,200)	$ (618)	$ (3,385)	$ 27,262	$ (6,203)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	300			(18)			1,845	309
(Loss) gain on long-term intra-entity foreign currency transactions	154			(509)			(4,725)	(373)
Cash flow hedging activity	120			(127)			(162)	(1,426)
Reclassification of hedging activities into earnings	(432)			122			(457)	268
Pension plan adjustment				0				0
Reclassification of pension adjustments into earnings	114			127			406	313
Total other comprehensive income (loss), net of tax	256			(405)			(3,093)	(909)
Comprehensive income (loss)	$ (1,754)			(2,605)			$ 24,169	(7,112)
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)				397				(2,308)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment				(312)				244
(Loss) gain on long-term intra-entity foreign currency transactions				(509)				(373)
Cash flow hedging activity				(127)				(1,570)
Reclassification of hedging activities into earnings				122				268
Pension plan adjustment				0				0
Reclassification of pension adjustments into earnings				127				219
Total other comprehensive income (loss), net of tax				(699)				(1,212)
Comprehensive income (loss)				(302)				(3,520)
Restatement Impacts
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)				(2,597)				(3,895)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment				294				65
(Loss) gain on long-term intra-entity foreign currency transactions				0				0
Cash flow hedging activity				0				144
Reclassification of hedging activities into earnings				0				0
Pension plan adjustment				0				0
Reclassification of pension adjustments into earnings				0				94
Total other comprehensive income (loss), net of tax				294				303
Comprehensive income (loss)				$ (2,303)				$ (3,592)