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Financial Instruments (Schedule Of Pretax Effect On Net Income (Loss) And Other Comprehensive Income (Loss) Of Derivative Instruments Classified As Cash Flow Hedges) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Aluminum Futures Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | $ (4,525) | $ 6,215 | $ 74
Flexible Packaging Films |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | 0 | 0 | 0
Cost of Sales [Member] | Aluminum Futures Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax | 1,022 | 5,787 | (2,717)
Cost of Sales [Member] | Flexible Packaging Films |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 61 | 63 | 62
Selling, General and Administrative Expenses [Member] | Flexible Packaging Films |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | 3,269 | (2,415) | (4,437)
Selling, General and Administrative Expenses [Member] | Foreign Currency Forward Contracts | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ 1,378 | $ (337) | $ (6,069)

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