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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (179,447) $ (175,887) $ (179,447) $ (175,887) $ (208,719) $ (150,195)
Cost of goods sold 169,830 183,754 332,882 373,185    
Income before income taxes 4,725 1,497 15,223 16,146    
Income taxes from continuing operations 1,317 903 4,533 5,682    
Total, net of tax 3,408 594 10,690 10,464    
Foreign Currency Translation            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (89,159) (76,366) (89,159) (76,366) (112,807) (47,270)
Gain (Loss) on Derivative Financial Instruments            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax 644 (985) 644 (985) (373) 656
Pension & Other Post-retirement Benefit Adjust.            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (90,932) (98,536) (90,932) (98,536) $ (95,539) $ (103,581)
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 (509) (465) (1,478) (498)    
Income taxes from continuing operations (182) (176) (547) (189)    
Total, net of tax (327) (289) (931) (309)    
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 525 481 1,509 529    
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    
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 (3,336) [1] (3,985) (6,673) (7,969)    
Income taxes from continuing operations (1,211) (1,462) (2,066) (2,924)    
Total, net of tax $ (2,125) $ (2,523) $ (4,607) $ (5,045)    
[1] (a)This component of accumulated other comprehensive income is included in the computation of net periodic pension cost (see Note 8 for additional detail).