Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Unamortized computer software costs	$ 12,600	$ 6,200
Property, Plant and Equipment [Line Items]
Total	594,249	551,463
Less accumulated depreciation	(404,629)	(384,425)
Property, plant and equipment, net	189,620	167,038
Land
Property, Plant and Equipment [Line Items]
Total	4,275	4,194
Buildings
Property, Plant and Equipment [Line Items]
Total	128,887	125,223
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total	422,333	397,287
Construction in progress
Property, Plant and Equipment [Line Items]
Total	$ 38,753	$ 24,759