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Earnings per share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]                      
Net income (loss) $ (9,675) [1] $ (9,507) [2] $ (29,384) [3] $ 8,253 [4] $ (6,909) $ (12,023) [5] $ (12,277) [6] $ (4,401) [7] $ (40,313) $ (35,610) $ 11,325
Amount allocated to common shareholders (in hundredths)                 100.00% [8] 100.00% [8] 91.87%
Basic and Diluted EPS:                      
Net Income (Loss) Available to Common Stockholders, Basic and Diluted                 (40,313) (35,610)  
Weighted Average Number of Shares Outstanding, Basic and Diluted - Shares (000)                 88,612 88,534  
Basic and Diluted (in dollars per share) $ (0.11) [1] $ (0.11) [2] $ (0.33) [3] $ 0.09 [4] $ (0.08) $ (0.14) [5] $ (0.14) [6] $ (0.05) [7] $ (0.45) $ (0.40) $ 0.11
Basic EPS:                      
Net Income (Loss) Available to Common Stockholders, Basic (9,675) [1] (9,507) [2] (29,384) [3] 7,567 [4] (6,909) (12,023) [5] (12,277) [6] (4,401) [7]     10,404
Income (loss) allocable to common shareholders - in Shares (000)                     91,854
Income (loss) applicable to common shareholders (in dollars per share)                     $ 0.11
Effect of Dilutive Securities:                      
Share-based stock awards - in Shares (000)                     403
Diluted EPS:                      
Net Income (Loss) Available to Common Stockholders, Diluted                     $ 10,404
Income (loss) applicable to common shareholders with assumed conversion - in Shares (000)                     92,257
Income (loss) applicable to common shareholders with assumed conversion (in dollars per share)                     $ 0.11
[1] The fourth quarter of 2013 cost of sales included a benefit of $16,570 related to deferred power contract liability amortization and a $9,040 benefit for lower of cost or market inventory adjustments. The financial results also include an $8,400 charge relating to the separation of our former CEO.
[2] The third quarter of 2013 cost of sales included an $11,720 benefit for deferred power contract liability amortization and a $5,762 benefit for lower of cost or market inventory adjustments.
[3] The second quarter of 2013 amounts differ from our reported second quarter results due to purchase price accounting adjustments related to the Sebree acquisition which were retroactively applied to the second quarter of 2013. The second quarter of 2013 net loss included a gain on bargain purchase of $5,253 and power contract amortization of $2,741 associated with the Sebree acquisition. Results were negatively impacted by a charge of $3,272 for the early extinguishment of our 8.0% Notes and a charge for severance and other expenses of $1,750 related to our corporate headquarters relocation. Cost of sales for the quarter included a $10,211 charge for lower of cost or market inventory adjustments.
[4] The first quarter of 2013 net income included a net benefit of $2,225 related to a litigation reserve adjustment and an unrealized gain of $15,722 related to a LME-based contingent obligation. Results were negatively impacted by severance and other expenses of $2,213 related to our corporate headquarters relocation. Cost of sales for the quarter included a $5,838 charge for lower of cost or market inventory adjustments.
[5] The third quarter of 2012 net loss included a net benefit of $4,100 related to certain litigation items. Cost of sales for the quarter included an $8,201 benefit for lower of cost or market inventory adjustments.
[6] The second quarter of 2012 net loss included an unrealized net gain on forward contracts of $1,778 primarily related to the mark to market of aluminum price protection options. Cost of sales for the quarter included a $5,434 charge for lower of cost or market inventory adjustments.
[7] The first quarter of 2012 net loss included an unrealized loss on forward contracts of $4,955 primarily related to the mark to market of aluminum price protection options. Cost of sales for the quarter included a $17,051 benefit for lower of cost or market inventory adjustments.
[8] 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.