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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Property, Plant and Equipment      
Property, plant and equipment, gross $ 461,556 $ 438,708 $ 438,259
Less accumulated depreciation and amortization (275,096) (257,115) (255,431)
Property, plant and equipment excluding capital projects in progress, net 186,460 181,593 182,828
Capital projects in progress 43,210 32,123 20,057
Property, plant and equipment, net 229,670 213,716 202,885
Land      
Property, Plant and Equipment      
Property, plant and equipment, gross 30,217 28,698 28,899
Buildings and site improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 176,430 171,890 172,300
Leasehold improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 5,682 5,560 5,593
Machinery, equipment, and software      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 249,227 $ 232,560 $ 231,467