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Accumulated Other Comprehensive Income (Loss) (Schedule Of After-Tax Changes In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Selling, general and administrative $ 20,275 $ 21,190 $ 38,659 $ 41,234
Beginning of Period     (178,404) (197,651)
Other comprehensive income (loss) before reclassifications   (18,245) 4,069  
Amounts reclassified from accumulated other comprehensive income (loss)   9,587 5,145  
Net other comprehensive income (loss) - current period   (8,658) 9,214  
End of Period (169,190) (206,309) (169,190) (206,309)
Income (loss) from continuing operations before income taxes 26,451 18,192 39,166 (8,698)
Income Tax Expense (Benefit) 5,723 3,860 8,820 (2,366)
Net Income (Loss) Attributable to Parent 21,236 11,196 30,267 (11,126)
Foreign Currency Translation        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of Period     (84,149) (100,663)
Other comprehensive income (loss) before reclassifications   (12,003) 1,345  
Amounts reclassified from accumulated other comprehensive income (loss)   0 0  
Net other comprehensive income (loss) - current period   (12,003) 1,345  
End of Period (82,804) (112,666) (82,804) (112,666)
Gain (Loss) on Derivative Financial Instruments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of Period     2,264 (1,307)
Other comprehensive income (loss) before reclassifications   (6,242) 2,724  
Amounts reclassified from accumulated other comprehensive income (loss)   3,725 (1,492)  
Net other comprehensive income (loss) - current period   (2,517) 1,232  
End of Period 3,496 (3,824) 3,496 (3,824)
Pension & Other Post-retirement Benefit Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of Period     (96,519) (95,681)
Other comprehensive income (loss) before reclassifications   0 0  
Amounts reclassified from accumulated other comprehensive income (loss)   5,862 6,637  
Net other comprehensive income (loss) - current period   5,862 6,637  
End of Period (89,882) (89,819) (89,882) (89,819)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (Loss) on Derivative Financial Instruments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Income (loss) from continuing operations before income taxes 1,241 (3,333) 1,896 (4,752)
Income Tax Expense (Benefit) 257 (721) 404 (1,027)
Net Income (Loss) Attributable to Parent 984 (2,612) 1,492 (3,725)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension & Other Post-retirement Benefit Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Income Tax Expense (Benefit) (922) (835) (1,846) (1,671)
Net Income (Loss) Attributable to Parent (3,318) (2,931) (6,637) (5,862)
Amortization Of Prior Service Costs And Net Gains Loss (4,240) (3,766) (8,483) (7,533)
Aluminum Futures Contracts [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (Loss) on Derivative Financial Instruments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cost of goods sold 1,372 (1,551) 2,012 (2,191)
Cost of Sales [Member] | Foreign Currency Forward Contracts [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (Loss) on Derivative Financial Instruments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cost of goods sold $ 16 $ 16 $ 33 $ 31