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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Property, Plant and Equipment      
Property, plant and equipment, gross $ 438,259 $ 438,490 $ 439,905
Less accumulated depreciation and amortization (255,431) (245,383) (246,287)
Property, plant and equipment excluding capital projects in progress, net 182,828 193,107 193,618
Capital projects in progress 20,057 13,920 12,516
Property, plant and equipment, net 202,885 207,027 206,134
Land      
Property, Plant and Equipment      
Property, plant and equipment, gross 28,899 29,390 29,624
Buildings and site improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 172,300 175,058 174,343
Leasehold improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 5,593 5,602 5,404
Machinery, equipment, and software      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 231,467 $ 228,440 $ 230,534