Property, Plant and Equipment, Net - Summary of Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Less: Accumulated depreciation	$ (206,761)	$ (188,719)
Property, plant and equipment, net	97,437	105,038
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	69,360	68,350
Machinery and equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment gross	$ 233,743	$ 224,312