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Derivative Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2013
Derivatives, Fair Value [Line Items]  
Schedule Of Pretax Effect On Net Income (Loss) And Other Comprehensive Income (Loss) Of Derivative Instruments Classified As Cash Flow Hedges
(In Thousands)   Cash Flow Derivative Hedges  
    Aluminum Futures     Foreign Currency
    Contracts     Forwards
    Three Months Ended September 30,
    2013     2012     2013     2012
Amount of pre-taxgain (loss) recognized in                      
other comprehensive income $ (11 ) $ (617 ) $ 122   $ 1,132
Location of gain (loss) reclassified from                      
accumulated other comprehensive income   Cost of     Cost of            
into net income (effective portion)   sales     sales            
Amount of pre-taxgain (loss) reclassified                      
from accumulated other comprehensive                      
income to net income (effective portion) $ (268 ) $ (600 ) $ -   $ -
    Aluminum Futures     Foreign Currency
    Contracts     Forwards
    Nine Months Ended September 30,
    2013     2012     2013     2012
Amount of pre-taxgain (loss) recognized in                      
other comprehensive income $ (775 ) $ (1,317 ) $ (123 ) $ 1,132
Location of gain (loss) reclassified from                      
accumulated other comprehensive income   Cost of     Cost of            
into net income (effective portion)   sales     sales            
 
Amount of pre-taxgain (loss) reclassified                      
from accumulated other comprehensive                      
income to net income (effective portion) $ (417 ) $ (902 ) $ -   $ -
Aluminum Futures Contracts [Member]
  
Derivatives, Fair Value [Line Items]  
Summary Of Location And Fair Value Of Derivative Financial Instruments
  September 30, 2013   December 31, 2012  
  Balance Sheet   Fair   Balance Sheet Fair
(In Thousands) Account Value   Account Value
Derivatives Designated as Hedging Instruments              
Asset derivatives:         Prepaid expenses    
Aluminum futures contracts Accrued expenses $ 5   and other $ 226
Liability derivatives:         Prepaid expense    
Aluminum futures contracts Accrued expenses $ 223   and other $ 88
   Net asset (liability)   $ (218 )   $ 138
Foreign Currency Forward Contracts [Member]
  
Derivatives, Fair Value [Line Items]  
Summary Of Location And Fair Value Of Derivative Financial Instruments
  September 30, 2013 December 31, 2012  
  Balance Sheet   Fair Balance Sheet Fair
(In Thousands) Account Value Account Value
Derivatives Designated as Hedging Instruments            
Asset derivatives: Prepaid expenses     Prepaid expenses    
Foreign currency forward contracts and other $ 252 and other $ 948
Net asset (liability)   $ 252   $ 948