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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, 2020
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Selling, general and administrative $ 23,169 $ 22,012
Beginning of Period (197,651) (179,987)
Other comprehensive income (loss) before reclassifications (16,417) (1,801)
Amounts reclassified from accumulated other comprehensive income (loss) 4,044 2,737
Net other comprehensive income (loss) - current period (12,373) 936
End of Period (210,024) (179,051)
Income (loss) before income taxes (28,861) 23,811
Income Tax Expense (Benefit) (6,540) 4,026
Net income (loss) (22,321) 19,785
Foreign Currency Translation    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning of Period (100,663) (96,940)
Other comprehensive income (loss) before reclassifications (11,529) (790)
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Net other comprehensive income (loss) - current period (11,529) (790)
End of Period (112,192) (97,730)
Gain (Loss) on Derivative Financial Instruments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning of Period (1,307) (1,601)
Other comprehensive income (loss) before reclassifications (4,888) (1,011)
Amounts reclassified from accumulated other comprehensive income (loss) 1,113 658
Net other comprehensive income (loss) - current period (3,775) (353)
End of Period (5,082) (1,954)
Pension & Other Post-retirement Benefit Adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning of Period (95,681) (81,446)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 2,931 2,079
Net other comprehensive income (loss) - current period 2,931 2,079
End of Period (92,750) (79,367)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (Loss) on Derivative Financial Instruments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Income (loss) before income taxes (1,419) (793)
Income Tax Expense (Benefit) (306) (135)
Net income (loss) (1,113) (658)
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) (836) (592)
Net income (loss) (2,931) (2,079)
Amortization Of Prior Service Costs And Net Gains Loss (3,767) (2,671)
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) (617)
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 $ 15 $ 15