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Property, Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 195,713 $ 169,142
Land and improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 1,308 1,266
Buildings and improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 29,539 27,961
Machinery and equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 133,635 111,558
Dies and tools [Member]
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 31,231 $ 28,357