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Financial Instruments (Summary Of Location And Fair Value Of Derivative Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Aluminum Futures Contracts [Member] | Designated As Hedging Instrument [Member] | Accrued Expenses [Member]
   
Asset derivatives, Fair Value   $ 21
Liability derivatives, Fair Value   677
Aluminum Futures Contracts [Member] | Designated As Hedging Instrument [Member] | Prepaid Expenses And Other [Member]
   
Asset derivatives, Fair Value 226  
Liability derivatives, Fair Value 88  
Aluminum Futures Contracts [Member] | Not Designated As Hedging Instrument [Member] | Accrued Expenses [Member]
   
Asset derivatives, Fair Value    18
Liability derivatives, Fair Value    18
Foreign Currency Forward Contracts [Member] | Designated As Hedging Instrument [Member] | Prepaid Expenses And Other [Member]
   
Asset derivatives, Fair Value $ 948