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Summary of Significant Accounting Policies (Schedule of Reclassifications Out of AOCI) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Gain (loss) on derivative financial instruments:      
Cost of goods sold $ (784,675) $ (712,660) $ (654,087)
Income taxes 16,995 [1] 18,319 [1] 10,244 [1]
Amortization of pension and other post-retirement benefits:      
Income taxes 16,995 [1] 18,319 [1] 10,244 [1]
Gain (loss) on derivative financial instruments | Reclassification out of Accumulated Other Comprehensive Income
      
Gain (loss) on derivative financial instruments:      
Total, before taxes (583)    
Income taxes (221)    
Total, net of tax (362)    
Amortization of pension and other post-retirement benefits:      
Income taxes (221)    
Total, net of tax (362)    
Pension and other post-retirement benefit adjustments | Reclassification out of Accumulated Other Comprehensive Income
      
Gain (loss) on derivative financial instruments:      
Income taxes (5,398)    
Total, net of tax (9,420)    
Amortization of pension and other post-retirement benefits:      
Actuarial gain (loss) and prior service costs, before taxes (14,818) [2]    
Income taxes (5,398)    
Total, net of tax (9,420)    
Aluminum Futures Contracts | Gain (loss) on derivative financial instruments | Reclassification out of Accumulated Other Comprehensive Income
      
Gain (loss) on derivative financial instruments:      
Cost of goods sold (583)    
Foreign Currency Forward Contracts | Gain (loss) on derivative financial instruments | Reclassification out of Accumulated Other Comprehensive Income
      
Gain (loss) on derivative financial instruments:      
Cost of goods sold $ 0    
[1] See Notes 1, 3, 4 and 18 for more information on losses associated with plant shutdowns, asset impairments and restructurings, unusual items, gains or losses from sale of assets, gains or losses on an investment accounted for under the fair value method and other items.
[2] This component of accumulated other comprehensive income is included in the computation of net periodic pension cost (see Note 14 for additional detail).