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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
Mar. 31, 2017
Mar. 31, 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 $ (176,278) $ (193,396) $ (183,234) $ (208,719)
Cost of goods sold 181,848 163,053    
Income before income taxes 6,121 10,497    
Income taxes from continuing operations 2,418 3,216    
Net income 3,703 7,281    
Foreign Currency Translation        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (89,338) (100,228) (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 1,237 (111) 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 (88,177) (93,057) $ (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 (218) (969)    
Income taxes from continuing operations (81) (365)    
Net income (137) (604)    
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 (233) 984    
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    
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 (3,061) (3,337)    
Income taxes from continuing operations (1,111) (855)    
Net income $ (1,950) $ (2,482)