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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Property, Plant and Equipment      
Property, plant and equipment, gross $ 598,193 $ 579,592 $ 576,977
Less accumulated depreciation and amortization (369,655) (346,594) (339,920)
Property, plant and equipment excluding capital projects in progress, net 228,538 232,998 237,057
Capital projects in progress 17,934 16,014 13,893
Property, plant and equipment, net 246,472 249,012 250,950
Land      
Property, Plant and Equipment      
Property, plant and equipment, gross 28,287 28,092 29,132
Buildings and site improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 201,020 195,210 197,075
Leasehold improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 5,699 4,911 4,909
Machinery, equipment, and software      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 363,187 $ 351,379 $ 345,861