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Earnings (Loss) Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
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
Net Income (Loss) [Abstract]                      
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)
Amount allocated to common shareholders (in hundredths)                 91.87% 91.79%  
Basic EPS - net income (loss) [Abstract]                      
Income allocable to common shareholders, basic                 10,404 55,046 (205,982)
Effect of dilutive securities - net income (loss) [Abstract]                      
Service-based stock awards                   0  
Diluted EPS - net income (loss) [Abstract]                      
Income applicable to common shareholders with assumed conversion, diluted                 $ 10,404 $ 55,046 $ (205,982)
Shares [Abstract]                      
Number of shares outstanding, basic (in shares)                 91,854,000 92,676,000 75,343,000
Basic EPS - shares [Abstract]                      
Number of shares allocable to common shareholders (in shares)                 91,854,000 92,676,000 75,343,000
Effect of dilutive securities - shares [Abstract]                      
Share-based stock awards (in shares)                 403,000 626,000  
Number of shares outstanding applicable to common shareholders with assumed conversion (in shares)                 92,257,000 93,302,000 75,343,000
Per Share [Abstract]                      
Earnings per share basic and diluted (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)
Options [Member]
                      
Calculation of EPS [Abstract]                      
Number of options to purchase common stock outstanding (in shares) 632,334       675,575       632,334 675,575 692,075
Antidilutive securities excluded from calculation of diluted EPS (in shares)                 353,000 [8] 377,000 [8] 692,075 [8]
Service-Based Share Awards [Member]
                      
Calculation of EPS [Abstract]                      
Number of service-based share awards outstanding (in shares) 347,191       551,382       347,191 551,382 501,203
Antidilutive securities excluded from calculation of diluted EPS (in shares)                 0 0 501,203
Convertible Debt Securities [Member]
                      
Calculation of EPS [Abstract]                      
Antidilutive securities excluded from calculation of diluted EPS (in shares)                 0 [9] 0 [9] 0 [9]
Convertible notes payable, interest rate (in hundredths) 1.75%       1.75%       1.75% 1.75% 1.75%
[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.
[8] 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 years when we had a net loss where all options were excluded because of their antidilutive effect on earnings per share.
[9] In periods in which our 1.75% Notes were outstanding, the average price for our common stock was below the conversion price of our 1.75% Notes.