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Accumulated Other Comprehensive Income (Loss) (Schedule Of Reclassifications Of Balances Out Of Accumulated Other Comprehensive Income (Loss) Into Net Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (210,024) $ (179,051) $ (197,651) $ (179,987)
Selling, general and administrative 23,169 22,012    
Income before income taxes 28,861 (23,811)    
Income taxes from continuing operations 6,540 (4,026)    
Net income (loss) (22,321) 19,785    
Foreign Currency Translation        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (112,192) (97,730) (100,663) (96,940)
Gain (Loss) on Derivative Financial Instruments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (5,082) (1,954) (1,307) (1,601)
Pension & Other Post-retirement Benefit Adjustment        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (92,750) (79,367) $ (95,681) $ (81,446)
Reclassification Out Of Accumulated Other Comprehensive Income | Gain (Loss) on Derivative Financial Instruments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income before income taxes 1,419 793    
Income taxes from continuing operations 306 135    
Net income (loss) (1,113) (658)    
Reclassification Out Of Accumulated Other Comprehensive Income | Gain (Loss) on Derivative Financial Instruments | Aluminum Futures Contracts        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of goods sold (640) (617)    
Reclassification Out Of Accumulated Other Comprehensive Income | Pension & Other Post-retirement Benefit Adjustment        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Actuarial gain (loss) and prior service costs, before taxes (3,767) (2,671)    
Income taxes from continuing operations 836 592    
Net income (loss) (2,931) (2,079)    
Selling, General and Administrative Expenses [Member] | Reclassification Out Of Accumulated Other Comprehensive Income | Gain (Loss) on Derivative Financial Instruments | Foreign Currency Forward Contracts        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of goods sold   (191)    
Selling, general and administrative (794)      
Cost of Sales [Member] | Reclassification Out Of Accumulated Other Comprehensive Income | Gain (Loss) on Derivative Financial Instruments | Foreign Currency Forward Contracts        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Cost of goods sold $ 15 $ 15