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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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 $ (181,541) $ (176,698) $ (181,541) $ (176,698) $ (176,669) $ (183,234)
Cost of goods sold (210,667) (195,286) (413,856) (375,047)    
Selling, general and administrative 20,946 21,184 42,775 41,133    
Income before income taxes (19,269) (47,031) (42,721) (53,152)    
Income taxes from continuing operations (4,547) (2,827) (9,834) (5,246)    
Net income 14,722 44,204 32,887 47,906    
Foreign Currency Translation            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (95,083) (91,296) (95,083) (91,296) (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 (731) 825 (731) 825 459 863
Pension & Other Post-retirement Benefit Adjustment            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (85,727) (86,227) (85,727) (86,227) $ (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 (350) (337) (556) (585)    
Income taxes from continuing operations (142) (125) (195) (212)    
Net income 208 212 361 373    
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 (712) (321) 944 554    
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 (3,372) (3,061) (6,746) (6,122)    
Income taxes from continuing operations 761 1,111 1,523 2,222    
Net income (2,611) (1,950) (5,223) (3,900)    
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 (378)   (419)      
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)