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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
	Mar. 31, 2024	Mar. 31, 2023
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)	$ 721	$ 1,402
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (effective portion)	519	672
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
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (effective portion)	15	15
Foreign Currency Forwards | Selling, general & admin
Derivative Instruments, Gain (Loss) [Line Items]
Amount of pre-tax gain (loss) recognized in other comprehensive income (loss)	(439)	1,676
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (effective portion)	$ 393	$ 286

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4E
-Publisher FASB
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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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