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Debt (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |  |  |
Debt | $ 271,894 |  | $ 271,285 |
Term of credit facility | 4 years |  |  |
Senior secured notes due May 15, 2014 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate (as a percent) | 8.00% |  |  |
Senior unsecured notes due August 15, 2014 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate (as a percent) | 7.50% |  |  |
Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior secured revolving credit facility amount | 100,000 |  |  |
Borrowing availability, net of outstanding letters of credit | 52,932 |  |  |
Outstanding borrowings on revolving credit facility | 0 |  |  |
Letter of credit sub-facility amount | 50,000 |  |  |
Outstanding letters of credit issued under the revolving credit facility | 41,451 |  |  |
Current [Member] | Industrial revenue bonds due 2028 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 7,815 | [1] | 7,815 | [1]
Variable interest rates, maximum (as a percent) | 12.00% |  | 12.00% |
Interest rate (as a percent) | 0.44% |  |  |
Maturity date | Apr. 01, 2028 |  | Apr. 01, 2028 |
Long-Term [Member] | Senior secured notes due May 15, 2014 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 247,166 |  | 246,909 |
Interest rate (as a percent) | 8.00% |  | 8.00% |
Maturity date | May 15, 2014 |  | May 15, 2014 |
Net of debt discount | 2,438 |  | 2,695 |
Long-Term [Member] | Senior unsecured notes due August 15, 2014 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 2,603 |  | 2,603 |
Interest rate (as a percent) | 7.50% |  | 7.50% |
Maturity date | Aug. 15, 2014 |  | Aug. 15, 2014 |
Long-Term [Member] | Contingent obligation [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | $ 14,310 | [2] | $ 13,958 | [2]
Interest rate (as a percent) | 10.94% |  | 10.94% |
Maturity date | Dec. 31, 2028 |  | Dec. 31, 2028 |
[1] | The IRBs are classified as current liabilities because they are remarketed weekly and could be required to be repaid upon demand if there is a failed remarketing. The IRB interest rate at March 31, 2012 was 0.44%.
[2] | E.ON contingent obligation principal and interest payments are payable based on CAKY’s operating level and the LME price for primary aluminum. See E.ON contingent obligation below.

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