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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Property, Plant and Equipment      
Property, plant and equipment, gross $ 576,977 $ 563,745 $ 561,281
Less accumulated depreciation and amortization (339,920) (318,388) (316,768)
Property, plant and equipment excluding capital projects in progress, net 237,057 245,357 244,513
Capital projects in progress 13,893 9,240 13,166
Property, plant and equipment, net 250,950 254,597 257,679
Land      
Property, Plant and Equipment      
Property, plant and equipment, gross 29,132 30,034 30,173
Buildings and site improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 197,075 198,809 203,323
Leasehold improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 4,909 4,826 4,694
Machinery, equipment, and software      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 345,861 $ 330,076 $ 323,091