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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Property, Plant and Equipment      
Property, plant and equipment, gross $ 566,849 $ 550,922 $ 512,086
Less accumulated depreciation and amortization (313,088) (299,907) (288,287)
Property, plant and equipment excluding capital projects in progress, net 253,761 251,015 223,799
Capital projects in progress 15,366 22,005 37,563
Property, plant and equipment, net 269,127 273,020 261,362
Land      
Property, Plant and Equipment      
Property, plant and equipment, gross 32,121 33,087 32,686
Buildings and site improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 209,888 212,817 201,723
Leasehold improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 4,709 4,684 5,605
Machinery, equipment, and software      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 320,131 $ 300,334 $ 272,072