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Earnings per share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Earnings Per Share [Abstract]      
Net income (loss) $ 8,253 $ (4,401)  
Amount allocated to common shareholders (in hundredths) 91.69% [1] 100.00% [1]  
Net income (loss) allocated to common shareholders 7,567 (4,401)  
Basic EPS:      
Income (loss) allocable to common shareholders - in Shares (000) 88,555,000 88,727,000  
Income (loss) allocable to common shareholders (in dollars per share) $ 0.09 $ (0.05)  
Effect of Dilutive Securities:      
Stock compensation plans 0 0  
Share-based stock awards - in Shares (000) 465,000 0  
Diluted EPS:      
Income (loss) applicable to common shareholders with assumed conversion $ 7,567 $ (4,401)  
Income (loss) applicable to common shareholders with assumed conversion - in Shares (000) 89,020,000 88,727,000  
Income (loss) applicable to common shareholders with assumed conversion (in dollars per share) $ 0.09 $ (0.05)  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Options to purchase common stock outstanding (in shares)     632,334
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 626,334    
Weighted Average Number of Shares Outstanding, Basic 415,958 345,524  
Options [Member]
      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from calculation of diluted EPS (in shares) 347,934 [2] 632,334 [2]  
Service-Based Share Awards [Member]
      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from calculation of diluted EPS (in shares) 0 345,524  
[1] (1)We have not allocated net losses between common and preferred shareholders, as the holders of our preferred shares do not have a contractual obligation to share in the loss.
[2] Based on the LME forward market prices for primary aluminum at March 31, 2013 and management's estimate of the LME forward market for periods beyond the quoted periods, we believe that we will not have any payment obligations for the E.ON contingent obligation through the term of the agreement which expires in 2028. See Note 9 Debt for additional information about the E.ON contingent obligation fair value.