Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, plant and equipment
Land	$ 10,584	$ 10,598
Building improvements	659,676	650,769
Capitalized leases for machinery, equipment and buildings	100,530	103,903
Property, plant and equipment, gross	770,790	765,270
Accumulated depreciation and amortization	(579,644)	(537,046)
Property Plant and Equipment Net before Construction in Progress	191,146	228,224
Construction in Progress, Gross	38,993	20,565
Property, plant and equipment, net	$ 230,139	$ 248,789

Property plant and equipment net before construction in progress.

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- Definition

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 of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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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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