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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 461,991 $ 466,362
Less accumulated depreciation (317,036) (315,010)
Net property 144,955 151,352
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,833 3,573
Building    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 106,263 110,144
Machinery and Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 337,700 335,318
Construction in Progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 16,195 $ 17,327