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Derivative Financial Instruments (Schedule Of Pretax Effect On Net Income (Loss) And Other Comprehensive Income (Loss) Of Derivative Instruments Classified As Cash Flow Hedges) (Details) (Cash Flow Derivative Hedges [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Aluminum Futures Contracts [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of pre-tax gain (loss) recognized in other comprehensive income $ (387) $ 589
Aluminum Futures Contracts [Member] | Cost Of Sales [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income to net income (effective portion) 42 (171)
Foreign Currency Forwards And Options [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of pre-tax gain (loss) recognized in other comprehensive income $ (389)