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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Property, Plant and Equipment      
Property, plant and equipment, gross $ 512,086 $ 470,420 $ 448,675
Less accumulated depreciation and amortization (288,287) (273,302) (268,096)
Property, plant and equipment excluding capital projects in progress, net 223,799 197,118 180,579
Capital projects in progress 37,563 35,692 38,812
Property, plant and equipment, net 261,362 232,810 219,391
Land      
Property, Plant and Equipment      
Property, plant and equipment, gross 32,686 32,127 30,165
Buildings and site improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 201,723 183,882 172,279
Leasehold improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 5,605 5,550 5,667
Machinery, equipment, and software      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 272,072 $ 248,861 $ 240,564