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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Property, Plant and Equipment      
Property, plant and equipment, gross $ 570,276 $ 550,922 $ 479,264
Less accumulated depreciation and amortization (309,198) (299,907) (279,607)
Property, plant and equipment excluding capital projects in progress, net 261,078 251,015 199,657
Capital projects in progress 15,036 22,005 50,808
Property, plant and equipment, net 276,114 273,020 250,465
Land      
Property, Plant and Equipment      
Property, plant and equipment, gross 33,234 33,087 32,370
Buildings and site improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 214,074 212,817 186,974
Leasehold improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 4,767 4,684 5,515
Machinery, equipment, and software      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 318,201 $ 300,334 $ 254,405