Restatement of Previously Issued Consolidated Financial Statements - Effect of The Error Corrections On The Condensed Consolidated 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	$ 4,178			$ 7,180			$ (32,913)	$ 23,312
Other comprehensive income (loss):
Foreign currency translation adjustments	2,628			(3,388)			(257)	(3,051)
Minimum pension liability, net of tax	(957)			(2,095)			(1,850)	(1,005)
Derivative instrument	893			(515)			(781)	(193)
Other comprehensive (loss) income	2,564			(5,998)			(2,888)	(4,249)
Comprehensive (loss) income	$ 6,742	$ (9,919)	$ (32,624)	1,182	$ 8,101	$ 9,780	$ (35,801)	19,063
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Income				8,520				26,827
Other comprehensive income (loss):
Foreign currency translation adjustments				(3,388)				(3,051)
Minimum pension liability, net of tax				(2,095)				(1,005)
Derivative instrument				(515)				(193)
Other comprehensive (loss) income				(5,998)				(4,249)
Comprehensive (loss) income				2,522				22,578
Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Income				(1,340)				(3,515)
Other comprehensive income (loss):
Foreign currency translation adjustments				0				0
Minimum pension liability, net of tax				0				0
Derivative instrument				0				0
Other comprehensive (loss) income				0				0
Comprehensive (loss) income				$ (1,340)				$ (3,515)