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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (167,375) $ (178,254) $ (167,375) $ (178,254) $ (183,234) $ (208,719)
Cost of goods sold (196,393) (166,622) (575,614) (499,504)    
Income before income taxes 12,696 9,379 65,847 24,602    
Income taxes from continuing operations (4,422) 2,669 (9,667) (1,864)    
Net income 8,274 12,048 56,180 22,738    
Foreign Currency Translation            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (84,153) (89,878) (84,153) (89,878) (93,970) (112,807)
Gain (Loss) on Derivative Financial Instruments            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax 1,151 590 1,151 590 863 (373)
Pension & Other Post-retirement Benefit Adjust.            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (84,373) (88,966) (84,373) (88,966) $ (90,127) $ (95,539)
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 246 (145) 831 (1,623)    
Income taxes from continuing operations (90) 53 (302) 600    
Net income 156 (92) 529 (1,023)    
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 231 (160) 785 (1,669)    
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)    
Reclassification Out Of Accumulated Other Comprehensive Income | Pension & Other Post-retirement Benefit Adjust.            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Actuarial gain (loss) and prior service costs, before taxes (2,911) (3,086) (9,033) (9,759)    
Income taxes from continuing operations 1,057 1,120 3,279 3,186    
Net income $ (1,854) $ (1,966) $ (5,754) $ (6,573)