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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 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 $ (206,309) $ (175,844) $ (206,309) $ (175,844) $ (197,651) $ (179,987)
Selling, general and administrative 25,212 23,864 48,381 45,875    
Income before income taxes (14,260) (18,917) 14,603 (42,728)    
Income taxes from continuing operations (3,064) (4,440) 3,477 (8,467)    
Net income (loss) 11,196 14,477 (11,126) 34,261    
Foreign Currency Translation            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (112,666) (97,223) (112,666) (97,223) (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 (3,824) (1,333) (3,824) (1,333) (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 (89,819) (77,288) (89,819) (77,288) $ (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 3,333 959 4,752 1,752    
Income taxes from continuing operations 721 131 1,027 266    
Net income (loss) (2,612) (828) (3,725) (1,486)    
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 (1,551) (606) (2,191) (1,223)    
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 (3,766) (2,672) (7,533) (5,343)    
Income taxes from continuing operations 835 593 1,671 1,185    
Net income (loss) (2,931) (2,079) (5,862) (4,158)    
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   (369)   (560)    
Selling, general and administrative (1,798)   (2,592)      
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 $ 16 $ 16 $ 31 $ 31