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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Property, Plant and Equipment
Property, plant and equipment, gross	$ 645,732	$ 635,642	$ 621,781
Less accumulated depreciation and amortization	(406,835)	(402,246)	(382,907)
Property, plant and equipment excluding capital projects in progress, net	238,897	233,396	238,874
Capital projects in progress	26,778	26,473	16,810
Property, plant and equipment, net	265,675	259,869	255,684
Land
Property, Plant and Equipment
Property, plant and equipment, gross	34,591	28,175	28,280
Buildings and site improvements
Property, Plant and Equipment
Property, plant and equipment, gross	197,180	202,393	201,283
Leasehold improvements
Property, Plant and Equipment
Property, plant and equipment, gross	6,153	5,995	7,023
Machinery, equipment, and software
Property, Plant and Equipment
Property, plant and equipment, gross	$ 407,808	$ 399,079	$ 385,195

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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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