Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment
Gross property, plant and equipment	$ 1,860,623	$ 1,882,303
Less: Accumulated depreciation	(1,223,143)	(1,228,390)
Property, plant and equipment, net	637,480	653,913
Land
Property, Plant and Equipment
Gross property, plant and equipment	72,678	73,067
Land improvements
Property, Plant and Equipment
Gross property, plant and equipment	16,706	16,970
Buildings and improvements
Property, Plant and Equipment
Gross property, plant and equipment	218,950	221,236
Machinery and equipment
Property, Plant and Equipment
Gross property, plant and equipment	1,490,695	1,507,214
Construction in progress
Property, Plant and Equipment
Gross property, plant and equipment	$ 61,594	$ 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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