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Quarterly Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Quarterly Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 318,164 | [1] | $ 345,646 | [2] | $ 366,277 | [3] | $ 326,337 | [4] | $ 316,851 | [5] | $ 279,178 | [6] | $ 287,853 | [7] | $ 285,389 | $ 1,356,424 | $ 1,169,271 | $ 899,253
Gross profit (loss) | (13,632) | [1] | 11,324 | [2] | 49,514 | [3] | 42,316 | [4] | 41,135 | [5] | 15,769 | [6] | 21,516 | [7] | 33,976 | 89,522 | 112,396 | (65,665)
Net income (loss) | (31,107) | [1] | (6,600) | [2] | 23,986 | [3] | 25,046 | [4] | 65,280 | [5] | (16,787) | [6] | 5,146 | [7] | 6,332 | 11,325 | 59,971 | (205,982)
Net income (loss) allocated to common shareholders | (31,107) | [1] | (6,600) | [2] | 22,061 | [3] | 23,005 | [4] | 59,939 | [5] | (16,787) | [6] | 4,723 | [7] | 5,808 |  |  |
Net income (loss) per share (in dollars per share) | $ (0.35) | [1] | $ (0.07) | [2] | $ 0.24 | [3] | $ 0.25 | [4] | $ 0.65 | [5] | $ (0.18) | [6] | $ 0.05 | [7] | $ 0.06 | $ 0.11 | $ 0.59 | $ (2.73)
Retiree medical benefits program changes |  |  |  |  | 8,953 |  | 9,418 |  | 56,728 |  |  |  |  |  |  |  |  |
Mark-to-market gain (losses) for primary aluminum price protection options | 3,067 |  | 4,163 |  |  |  | 4,809 |  | 5,681 |  | 12,136 |  | 9,294 |  |  |  |  |
Termination pension benefits |  |  |  |  |  |  |  |  | 4,555 |  |  |  |  |  |  |  |  |
Restart of curtailed potline at Hawesville |  |  |  |  |  |  | 6,462 |  |  |  |  |  |  |  |  |  |  |
Market inventory adjustments | 6,303 |  | 13,479 |  |  |  |  |  |  |  | 7,300 |  | (7,056) |  |  | 6,303 |  |
Impact of recent changes in the composition of board of directors and executive management team |  |  |  |  | 7,707 |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance claim receivable |  |  |  |  | $ 2,889 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The fourth quarter of 2011 net loss includes benefit of $3,067 for mark-to-market gains primarily related to primary aluminum price protection options and a $6,303 charge for lower of cost or market inventory adjustments.
[2] | The third quarter of 2011 net loss includes a benefit of $4,163 for mark-to-market gains primarily related to primary aluminum price protection options and a $13,479 charge for lower of cost or market inventory adjustments.
[3] | The second quarter of 2011 net income includes a benefit of $8,953 for changes to the Century of West Virginia retiree medical benefits program, a $7,707 charge related to the contractual impact of recent changes in the composition of our Board of Directors and executive management team and a $2,889 charge related to an insurance claim receivable.
[4] | The first quarter of 2011 net income includes a charge of $4,809 for mark-to-market losses primarily related to primary aluminum price protection options, a benefit of $9,418 for changes to the Century of West Virginia retiree medical benefits program and a $6,462 charge for the restart of the curtailed potline at Hawesville.
[5] | The fourth quarter of 2010 net income includes a benefit of $56,728 for changes to the Century of West Virginia retiree medical benefits program, a charge of $5,681 for mark-to-market losses for primary aluminum price protection options and a charge for contractual termination pension benefits of $4,555 due to the continued curtailment of the Ravenswood facility.
[6] | The third quarter of 2010 net loss includes a charge of $12,136 for mark-to-market losses primarily related to primary aluminum price protection options and a $7,300 benefit for lower of cost or market inventory adjustments.
[7] | The second quarter of 2010 net income includes a charge of $9,294 for mark-to-market losses primarily related to primary aluminum price protection options and a $7,056 charge for lower of cost or market inventory adjustments.

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