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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 Hedging - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Aluminum Futures Contracts | Cost of goods sold |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of pre-tax gain (loss) recognized in other comprehensive income (loss) | $ (2,320) | $ 2,919 | $ (6,060) | $ 6,629
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (effective portion) | 837 | 2,160 | 2,135 | 4,172
Foreign Currency Forwards | Cost of goods sold |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of pre-tax gain (loss) recognized in other comprehensive income (loss) | 0 | 0 | 0 | 0
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (effective portion) | 16 | 15 | 46 | 48
Foreign Currency Forwards | Selling, general & admin |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of pre-tax gain (loss) recognized in other comprehensive income (loss) | 115 | (1,670) | 2,177 | (1,892)
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (effective portion) | $ 306 | $ (34) | $ 975 | $ (183)

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