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Debt (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on E.ON obligation | $ (15,722) |  | $ 0 |  |  |
Industrial revenue bonds | 7,815 |  |  |  | 7,815 |
Debt | 258,676 |  |  |  | 273,766 |
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 | 50,571 |  |  |  |  |
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 | 46,145 |  |  |  |  |
Current [Member] | Industrial revenue bonds due 2028 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Industrial revenue bonds | 7,815 | [1] |  |  | 7,815 | [1]
Variable interest rates, maximum (as a percent) | 12.00% | [1] | 12.00% | [1] |  |
Interest rate (as a percent) | 0.32% |  |  |  |  |
Maturity date | Apr. 01, 2028 | [1] | Apr. 01, 2028 | [1] |  |
Net of debt discount | 0 | [1] |  |  | 0 | [1]
Long-Term [Member] | Senior secured notes due May 15, 2014 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (as a percent) | 8.00% |  |  |  | 8.00% |
Maturity date | May 15, 2014 |  | May 15, 2014 |  |  |
Net of debt discount | 1,346 |  |  |  | 1,626 |
Secured Long-term Debt, Noncurrent | 248,258 |  |  |  | 247,979 |
Long-Term [Member] | Senior unsecured notes due August 15, 2014 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (as a percent) | 7.50% |  |  |  | 7.50% |
Maturity date | Aug. 15, 2014 |  | Aug. 15, 2014 |  |  |
Net of debt discount | 0 |  |  |  | 0 |
Unsecured Long-term Debt, Noncurrent | 2,603 |  |  |  | 2,603 |
Long-Term [Member] | Contingent obligation [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (as a percent) | 10.94% | [2] |  |  | 10.94% | [2]
Maturity date | Dec. 31, 2028 | [2] | Dec. 31, 2028 | [2] |  |
Net of debt discount | 0 | [2] |  |  | 0 | [2]
E.ON Contingent Obligation | $ 0 | [2] |  |  | $ 15,369 | [2]
[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, 2013 was 0.32%.
[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 and Note 3 Fair value measurements for additional information.

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- Definition Sum of the carrying values as of the balance sheet date of the E.ON Contingent Obligation which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer. The E.ON contingent obligation consists of the aggregate E.ON payments. Obligation to make repayments is contingent upon certain operating criteria. When the conditions for repayment are met, and for so long so those conditions continue to be met, there is obligation to make principal and interest payments. + References No definition available. + Details
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