Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment
Gross property, plant and equipment	$ 1,895,459	$ 1,806,603
Less: Accumulated depreciation	(1,254,572)	(1,244,817)
Property, plant and equipment, net	640,887	561,786
Land
Property, Plant and Equipment
Gross property, plant and equipment	75,777	30,409
Land improvements
Property, Plant and Equipment
Gross property, plant and equipment	18,748	19,155
Buildings and improvements
Property, Plant and Equipment
Gross property, plant and equipment	225,406	182,795
Machinery and equipment
Property, Plant and Equipment
Gross property, plant and equipment	1,511,120	1,518,652
Construction in progress
Property, Plant and Equipment
Gross property, plant and equipment	$ 64,408	$ 55,592

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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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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