Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment
Gross property, plant and equipment	$ 1,906,546	$ 1,882,303
Less: Accumulated depreciation	(1,251,781)	(1,228,390)
Property, plant and equipment, net	654,765	653,913
Land
Property, Plant and Equipment
Gross property, plant and equipment	73,071	73,067
Land improvements
Property, Plant and Equipment
Gross property, plant and equipment	16,934	16,970
Buildings and improvements
Property, Plant and Equipment
Gross property, plant and equipment	224,746	221,236
Machinery and equipment
Property, Plant and Equipment
Gross property, plant and equipment	1,532,183	1,507,214
Construction in progress
Property, Plant and Equipment
Gross property, plant and equipment	$ 59,612	$ 63,816

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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