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Earnings per share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 23 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Earnings Per Share [Abstract]          
Net loss $ (34,573) $ (12,277) $ (26,320) $ (16,678)  
Amount allocated to common shareholders (in hundredths) 100.00% [1] 100.00% [1] 100.00% 100.00%  
Basic EPS:          
Net loss allocated to common shareholders (34,573) (12,277) (26,320) (16,678)  
Net loss allocable to common shareholders - (in Shares) 88,597,000 88,452,000 88,576,000 88,589,000  
Earnings Per Share, Basic $ (0.39) $ (0.14) $ (0.30) $ (0.19)  
Diluted EPS:          
Net loss applicable to common shareholders with assumed conversion $ (34,573) $ (12,277) $ (26,320) $ (16,678)  
Net loss applicable to common shareholders with assumed conversion - (in Shares) 88,597,000 88,452,000 88,576,000 88,589,000  
Earnings Per Share, Diluted $ (0.39) $ (0.14) $ (0.30) $ (0.19)  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Options to purchase common stock outstanding (in shares) 620,334 626,334 620,334 626,334 620,334
Weighted Average Number of Shares Outstanding, Basic 576,510 395,791 496,234 370,658  
Stock Repurchased During Period, Shares_Treasury       400,000 4,786,521
Options [Member]
          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from calculation of diluted EPS (in shares) 620,334 [2] 626,334 [2] 620,334 [3] 632,334 [3]  
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) 576,510 395,791 496,234 370,658  
[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] These stock option awards were excluded from the calculation of diluted EPS because the exercise price of these options was greater than the average market price of the underlying common stock, except in periods when we had a net loss where all options were excluded because of their antidilutive effect on earnings per share.
[3] Based on the LME forward market prices for primary aluminum at June 30, 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 10 Debt for additional information about the E.ON contingent obligation fair value.