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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Property, Plant and Equipment
Property, plant and equipment, gross	$ 621,781	$ 611,988	$ 581,698
Less accumulated depreciation and amortization	(382,907)	(377,460)	(351,776)
Property, plant and equipment excluding capital projects in progress, net	238,874	234,528	229,922
Capital projects in progress	16,810	20,656	17,019
Property, plant and equipment, net	255,684	255,184	246,941
Land
Property, Plant and Equipment
Property, plant and equipment, gross	28,280	28,553	27,964
Buildings and site improvements
Property, Plant and Equipment
Property, plant and equipment, gross	201,283	203,421	193,971
Leasehold improvements
Property, Plant and Equipment
Property, plant and equipment, gross	7,023	7,091	4,832
Machinery, equipment, and software
Property, Plant and Equipment
Property, plant and equipment, gross	$ 385,195	$ 372,923	$ 354,931

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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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