Property, Plant and Equipment - Summary of Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Less: Accumulated depreciation	$ (200,909)		$ (188,719)
Property, plant and equipment, net	97,777		105,038
Depreciation expense	13,003	$ 12,657
Land and Land Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	1,095		1,095
Buildings and Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	69,007		68,350
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	$ 228,584		$ 224,312