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Derivative Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2012
Derivative Financial Instruments [Abstract]  
Summary Of Location And Fair Value Of Derivative Financial Instruments
  June 30, 2012 December 31, 2011
  Balance Sheet Fair Balance Sheet Fair
(In Thousands) Account Value Account Value
Derivatives Designated as Hedging Instruments            
Asset derivatives:            
Aluminum futures contracts   $ - Accrued expenses $ 21
Liability derivatives:            
Aluminum futures contracts Accrued expenses $ 1,054 Accrued expenses $ 677
 
Derivatives Not Designated as Hedging Instruments          
Asset derivatives:            
Aluminum futures contracts Accrued expenses $ 63 Accrued expenses $ 18
Liability derivatives:            
Aluminum futures contracts Accrued expenses $ 63 Accrued expenses $ 18
Schedule Of Derivative Instruments Effect On Other Comprehensive Income (Loss)