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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Property, Plant and Equipment      
Property, plant and equipment, gross $ 632,119 $ 611,988 $ 598,193
Less accumulated depreciation and amortization (400,981) (377,460) (369,655)
Property, plant and equipment excluding capital projects in progress, net 231,138 234,528 228,538
Capital projects in progress 24,409 20,656 17,934
Property, plant and equipment, net 255,547 255,184 246,472
Land      
Property, Plant and Equipment      
Property, plant and equipment, gross 28,232 28,553 28,287
Buildings and site improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 201,730 203,421 201,020
Leasehold improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 5,956 7,091 5,699
Machinery, equipment, and software      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 396,201 $ 372,923 $ 363,187