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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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of goods sold $ 198,121 $ 198,433 $ 580,899 $ 594,502
Total, before taxes 16,114 10,365 35,117 38,720
Income tax expense (benefit) 5,369 2,937 12,141 12,185
Total, net of tax 11,595 6,978 23,826 12,545
Reclassification Out Of Accumulated Other Comprehensive Income | Gain (Loss) on Derivative Financial Instruments
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total, before taxes 300 (268) 346 (417)
Income tax expense (benefit) 113 (101) 130 (157)
Total, net of tax 187 (167) 216 (260)
Reclassification Out Of Accumulated Other Comprehensive Income | Gain (Loss) on Derivative Financial Instruments | Aluminum Futures Contracts
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of goods sold (300) 268 (346) 417
Reclassification Out Of Accumulated Other Comprehensive Income | Gain (Loss) on Derivative Financial Instruments | Foreign Currency Forward Contracts
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of goods sold 0 0 0 0
Reclassification Out Of Accumulated Other Comprehensive Income | Pension & Other Post-retirement Benefit Adjust.
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Actuarial gain (loss) and prior service costs, before taxes (2,311) [1] (3,851) [1] (7,785) (11,149)
Income tax expense (benefit) (842) (1,410) (2,836) (4,083)
Total, net of tax $ (1,469) $ (2,441) $ (4,949) $ (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).