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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.

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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