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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Property, Plant and Equipment      
Property, plant and equipment, gross $ 449,020 $ 438,708 $ 431,584
Less accumulated depreciation and amortization (264,398) (257,115) (246,055)
Property, plant and equipment excluding capital projects in progress, net 184,622 181,593 185,529
Capital projects in progress 32,038 32,123 19,480
Property, plant and equipment, net 216,660 213,716 205,009
Land      
Property, Plant and Equipment      
Property, plant and equipment, gross 30,535 28,698 28,795
Buildings and site improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 173,605 171,890 171,541
Leasehold improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 5,616 5,560 5,428
Machinery, equipment, and software      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 239,264 $ 232,560 $ 225,820