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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of sales $ (198,433) $ (172,431) $ (594,502) $ (524,774)
Total, before taxes 10,365 18,686 38,720 40,653
Income tax expense (benefit) 2,937 4,476 12,185 11,318
Total, net of tax 6,978 7,427 12,545 17,778
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 (268)   (417)  
Income tax expense (benefit) (101)   (157)  
Total, net of tax (167)   (260)  
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 (268)   (417)  
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 (3,851) [1]   (11,149) [1]  
Income tax expense (benefit) (1,410)   (4,083)  
Total, net of tax $ (2,441)   $ (7,066)  
[1] This component of accumulated other comprehensive income is included in the computation of net periodic pension cost (see Note 10 for additional detail).