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Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2012
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 Contracts Foreign Currency Forwards and Options
Years Ended December 31,   2012     2011     2010     2012   2011   2010  
Amount of pre-tax gain (loss) recognized in                                
other comprehensive income $ (232 ) $ (802 ) $ (102 ) $ 1,421 $ - $ (284 )
Location of gain (loss) reclassified from                             Selling,  
accumulated other comprehensive income   Cost of     Cost of     Cost of           general and  
into net income (effective portion)   sales     sales     sales           admin. exp.  
Amount of pre-tax gain (loss) reclassified                                
from accumulated other comprehensive                                
income to net income (effective portion) $ (1,026 ) $ 308   $ 641   $ - $ - $ (271 )
Aluminum Futures Contracts [Member]
 
Derivatives, Fair Value [Line Items]  
Summary Of Location And Fair Value Of Derivative Financial Instruments
  December 31, 2012 December 31, 2011
  Balance Sheet   Fair Balance Sheet   Fair
(In Thousands) Account   Value Account   Value
 
Derivatives Designated as Hedging Instruments            
Asset derivatives: Prepaid expenses          
Aluminum futures contracts and other $ 226 Accrued expenses $ 21
Liability derivatives: Prepaid expenses          
Aluminum futures contracts and other $ 88 Accrued expenses $ 677
Derivatives Not Designated as Hedging Instruments            
Asset derivatives:            
Aluminum futures contracts   $ - Accrued expenses $ 18
Liability derivatives:            
Aluminum futures contracts   $ - Accrued expenses $ 18
Foreign Currency Forward Contracts [Member]
 
Derivatives, Fair Value [Line Items]  
Summary Of Location And Fair Value Of Derivative Financial Instruments
  December 31, 2012
  Balance Sheet   Fair
(In Thousands) Account   Value
Derivatives Designated as Hedging Instruments      
Asset derivatives: Prepaid expenses    
Foreign currency forward contracts and other $ 948