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Property, Plant and Equipment, Net (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Property, Plant and Equipment      
Property, plant and equipment, gross $ 445,856 $ 438,782 $ 426,311
Less accumulated depreciation and amortization (245,806) (235,535) (226,202)
Property, plant and equipment excluding capital projects in progress, net 200,050 203,247 200,109
Capital projects in progress 6,513 6,286 9,435
Property, plant and equipment, net 206,563 209,533 209,544
Land
     
Property, Plant and Equipment      
Property, plant and equipment, gross 30,242 29,347 30,390
Buildings and site improvements
     
Property, Plant and Equipment      
Property, plant and equipment, gross 177,604 178,391 174,771
Leasehold improvements
     
Property, Plant and Equipment      
Property, plant and equipment, gross 5,531 5,213 4,996
Machinery, equipment, and software
     
Property, Plant and Equipment      
Property, plant and equipment, gross $ 232,479 $ 225,831 $ 216,154