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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (180,898) $ (183,205) $ (180,898) $ (183,205) $ (179,987) $ (176,669)
Selling, general and administrative 23,130 20,676 69,006 63,452    
Income before income taxes (17,090) 40,899 (59,819) (1,821)    
Income taxes from continuing operations 43 6,699 (8,424) (3,135)    
Net income (loss) 17,133 (34,200) 51,395 (1,314)    
Foreign Currency Translation            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (103,231) (97,749) (103,231) (97,749) (96,940) (86,178)
Gain (Loss) on Derivative Financial Instruments            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (2,457) (2,432) (2,457) (2,432) (1,601) 459
Pension & Other Post-retirement Benefit Adjustment            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (75,210) (83,024) (75,210) (83,024) $ (81,446) $ (90,950)
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 902 492 2,654 (64)    
Income taxes from continuing operations 179 (23) 445 (218)    
Net income (loss) (723) (515) (2,209) (154)    
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 (816) 300 2,039 (1,244)    
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 (2,672) (3,492) (8,014) (10,238)    
Income taxes from continuing operations 593 789 1,778 2,312    
Net income (loss) (2,079) (2,703) (6,236) (7,926)    
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   (807)   (1,226)    
Selling, general and administrative (101)   (661)      
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 $ 46 $ 46