Financial Instruments (Schedule Of Pretax Effect On Net Income (Loss) And Other Comprehensive Income (Loss) Of Derivative Instruments Classified As Cash Flow Hedges) (Details) - Aluminum Futures Contracts [Member] - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	$ 43	$ 7,598	$ (4,525)
Cost of Sales [Member]
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	$ (612)	$ 4,508	$ 1,022

Financial Instruments (Schedule Of Pretax Effect On Net Income (Loss) And Other Comprehensive Income (Loss) Of Derivative Instruments Classified As Cash Flow Hedges) (Details) - Aluminum Futures Contracts [Member] - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2024

Dec. 31, 2023

Dec. 31, 2022

Derivatives, Fair Value [Line Items]

Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax

$ 43

$ 7,598

$ (4,525)

Cost of Sales [Member]

Derivatives, Fair Value [Line Items]

Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax

$ (612)

$ 4,508

$ 1,022