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Accumulated Other Comprehensive Income (Loss) (Schedule Of Reclassifications Of Balances Out Of Accumulated Other Comprehensive Income (Loss) Into Net Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Cost of sales $ (197,488) $ (175,857)
Total, before taxes 13,281 11,869
Income tax expense (benefit) 3,764 4,132
Total, net of tax 4,277 2,998
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Gain (Loss) On Derivative Financial Instruments [Member]
    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Total, before taxes 42  
Income tax expense (benefit) 16  
Total, net of tax 26  
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Gain (Loss) On Derivative Financial Instruments [Member] | Aluminum Futures Contracts [Member]
    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Cost of sales 42  
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Pension & Other Post-Retirement Benefit Adjust. [Member]
    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Actuarial gain (loss) and prior service costs, before taxes (3,649) [1]  
Income tax expense (benefit) (1,336)  
Total, net of tax $ (2,313)  
[1] This component of accumulated other comprehensive income is included in the computation of net periodic pension cost (see Note 10 for additional detail).