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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
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Selling, general and administrative $ 18,384 $ 20,044
Beginning of Period (178,404) (197,651)
Other comprehensive income (loss) before reclassifications (2,375) (16,417)
Amounts reclassified from accumulated other comprehensive income (loss) 2,810 4,044
Net other comprehensive income (loss) - current period 435 (12,373)
End of Period (177,969) (210,024)
Income (loss) from continuing operations before income taxes 12,715 (26,889)
Income Tax Expense (Benefit) 3,097 (6,226)
Net Income (Loss) Attributable to Parent 9,031 (22,321)
Foreign Currency Translation    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning of Period (84,149) (100,663)
Other comprehensive income (loss) before reclassifications (2,648) (11,529)
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Net other comprehensive income (loss) - current period (2,648) (11,529)
End of Period (86,797) (112,192)
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 273 (4,888)
Amounts reclassified from accumulated other comprehensive income (loss) (509) 1,113
Net other comprehensive income (loss) - current period (236) (3,775)
End of Period 2,028 (5,082)
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) 3,319 2,931
Net other comprehensive income (loss) - current period 3,319 2,931
End of Period (93,200) (92,750)
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 655 (1,419)
Income Tax Expense (Benefit) 146 (306)
Net Income (Loss) Attributable to Parent 509 (1,113)
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) (924) (836)
Net Income (Loss) Attributable to Parent (3,319) (2,931)
Amortization Of Prior Service Costs And Net Gains Loss (4,243) (3,767)
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 640 (640)
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 $ 17 $ 15