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Derivative Financial Instruments (Summary Of Location And Fair Value Of Derivative Financial Instruments) (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Aluminum Futures Contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Net asset (liability), Fair Value $ (218,000) $ 138,000
Foreign Currency Forward Contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Net asset (liability), Fair Value 252,000 948,000
Derivatives Designated As Hedging Instruments [Member] | Aluminum Futures Contracts [Member] | Accrued Expenses [Member]
   
Derivatives, Fair Value [Line Items]    
Asset derivatives: Fair Value 5,000  
Liability derivatives: Fair Value 223,000  
Derivatives Designated As Hedging Instruments [Member] | Aluminum Futures Contracts [Member] | Prepaid Expenses And Other [Member]
   
Derivatives, Fair Value [Line Items]    
Asset derivatives: Fair Value   226,000
Liability derivatives: Fair Value   88,000
Derivatives Designated As Hedging Instruments [Member] | Foreign Currency Forward Contracts [Member] | Prepaid Expenses And Other [Member]
   
Derivatives, Fair Value [Line Items]    
Asset derivatives: Fair Value 252,000 948,000
Derivatives Not Designated As Hedging Instruments [Member] | Aluminum Futures Contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Net asset (liability), Fair Value $ 0 $ 0