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, 2023	Mar. 31, 2022
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)	$ 1,402	$ 6,182
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (effective portion)	672	(1,005)
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)	1,676	3,821
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (effective portion)	$ 286	$ (137)

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, 2023

Mar. 31, 2022

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)

$ 1,402

$ 6,182

Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (effective portion)

672

(1,005)

Foreign Currency Forwards | Cost of goods sold