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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Property, Plant and Equipment
Property, plant and equipment, gross	$ 581,698	$ 579,592	$ 566,836
Less accumulated depreciation and amortization	(351,776)	(346,594)	(326,181)
Property, plant and equipment excluding capital projects in progress, net	229,922	232,998	240,655
Capital projects in progress	17,019	16,014	10,743
Property, plant and equipment, net	246,941	249,012	251,398
Land
Property, Plant and Equipment
Property, plant and equipment, gross	27,964	28,092	29,251
Buildings and site improvements
Property, Plant and Equipment
Property, plant and equipment, gross	193,971	195,210	196,848
Leasehold improvements
Property, Plant and Equipment
Property, plant and equipment, gross	4,832	4,911	4,831
Machinery, equipment, and software
Property, Plant and Equipment
Property, plant and equipment, gross	$ 354,931	$ 351,379	$ 335,906

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- Definition

Represents the aggregate of long-lived physical assets excluding capital projects in progress used in the normal conduct of business and not intended for resale.

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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 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 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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