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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (183,205) $ (167,375) $ (183,205) $ (167,375) $ (176,669) $ (183,234)
Selling, general and administrative 20,676 20,718 63,452 61,852    
Income before income taxes 40,899 (12,696) (1,821) (65,847)    
Income taxes from continuing operations 6,699 (4,422) (3,135) (9,667)    
Net income (loss) (34,200) 8,274 (1,314) 56,180    
Foreign Currency Translation            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (97,749) (84,153) (97,749) (84,153) (86,178) (93,970)
Gain (Loss) on Derivative Financial Instruments            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (2,432) 1,151 (2,432) 1,151 459 863
Pension & Other Post-retirement Benefit Adjustment            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (83,024) (84,373) (83,024) (84,373) $ (90,950) $ (90,127)
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 492 (246) (64) (831)    
Income taxes from continuing operations (23) (90) (218) (302)    
Net income (loss) (515) 156 (154) 529    
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]            
Freight 300 231 (1,244) (785)    
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 (3,492) (2,911) (10,238) (9,033)    
Income taxes from continuing operations 789 1,057 2,312 3,279    
Net income (loss) (2,703) (1,854) (7,926) (5,754)    
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]            
Selling, general and administrative (807)   (1,226)      
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]            
Freight $ 15 $ 15 $ 46 $ 46