Property, Plant and Equipment, Net - Summary of Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Less: Accumulated depreciation	$ (210,903)		$ (206,761)
Property, plant and equipment, net	94,848		97,437
Depreciation expense	4,431	$ 4,237
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	69,346		69,360
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	$ 235,310		$ 233,743

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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