Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 600,767	$ 594,249
Less: accumulated depreciation	(402,935)	(404,629)
Property, plant and equipment, net	197,832	189,620
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,189	4,275
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	128,776	128,887
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	426,336	422,333
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 40,466	$ 38,753