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Debt (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |  |  | 6 Months Ended |  | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended |  | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 Senior unsecured notes due August 15, 2014 [Member] | Jun. 30, 2013 Line of Credit [Member] | Jun. 30, 2013 Prior to June 1, 2016 [Member] Senior secured notes due June 01, 2021 [Member] | Jun. 30, 2013 June 1, 2016 up to May 31, 2017 [Member] Senior secured notes due June 01, 2021 [Member] | Jun. 30, 2013 June 1, 2017 up to May 31, 2018 [Member] Senior secured notes due June 01, 2021 [Member] | Jun. 30, 2013 June 1, 2018 up to May 31, 2019 [Member] Senior secured notes due June 01, 2021 [Member] | Jun. 30, 2013 June 1, 2019 and thereafter [Member] Senior secured notes due June 01, 2021 [Member] | Jun. 30, 2013 Current [Member] Industrial revenue bonds due 2028 [Member] | Dec. 31, 2012 Current [Member] Industrial revenue bonds due 2028 [Member] | Jun. 30, 2013 Long-Term [Member] Senior secured notes due June 01, 2021 [Member] | Dec. 31, 2012 Long-Term [Member] Senior secured notes due June 01, 2021 [Member] | Jun. 04, 2013 Long-Term [Member] Senior secured notes due June 01, 2021 [Member] | Jun. 30, 2013 Long-Term [Member] Senior secured notes due May 15, 2014 [Member] | Dec. 31, 2012 Long-Term [Member] Senior secured notes due May 15, 2014 [Member] | Jun. 30, 2013 Long-Term [Member] Senior unsecured notes due August 15, 2014 [Member] | Dec. 31, 2012 Long-Term [Member] Senior unsecured notes due August 15, 2014 [Member] | Jun. 30, 2013 Long-Term [Member] Contingent obligation [Member] | Dec. 31, 2012 Long-Term [Member] Contingent obligation [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Industrial revenue bonds | $ 7,815 |  | $ 7,815 |  |  |  |  |  |  |  | $ 7,815 | [1] | $ 7,815 | [1] |  |  |  |  |  |  |  |  |  |  |
Secured Long-term Debt, Noncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 246,358 | 0 |  | 0 | 247,979 |  |  |  |  |  |
Unsecured Long-term Debt, Noncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,603 | 2,603 |  |  |  |
E.ON Contingent Obligation | 0 |  | (15,369) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | [2] | 15,369 | [2]
Debt | 256,776 |  | 273,766 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rates, maximum (as a percent) |  |  |  |  |  |  |  |  |  |  | 12.00% | [1] | 12.00% | [1] |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 7.50% |  |  |  |  |  |  | 0.26% |  |  |  | 7.50% | 0.00% |  | 0.00% | 8.00% | 7.50% | 7.50% | 10.94% | [2] | 10.94% | [2]
Maturity date |  |  |  |  |  |  |  |  |  |  | Apr. 01, 2028 | [1] | Apr. 01, 2028 | [1] | Jun. 01, 2021 | Jun. 01, 2021 |  | May 15, 2014 | May 15, 2014 | Aug. 15, 2014 | Aug. 15, 2014 | Dec. 31, 2028 | [2] | Dec. 31, 2028 | [2]
Debt Instrument, Unamortized Discount |  |  |  |  |  |  |  |  |  |  | 0 | [1] | 0 | [1] | 3,642 | 0 |  | 0 | 1,626 | 0 | 0 | 0 | [2] | 0 | [2]
Term of credit facility | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured revolving credit facility amount |  |  |  |  | 137,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit sub-facility amount |  |  |  |  | 80,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing availability, net of outstanding letters of credit |  |  |  |  | 63,955 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings on revolving credit facility |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit issued under the revolving credit facility |  |  |  |  | 73,545 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 246,330 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Collateral, Equity Interests in Foreign Subsidiaries | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Redemptions Rights As Percentage Of Principal Amount |  |  |  |  |  | 100.00% | 105.625% | 103.75% | 101.875% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Redemptions Rights After Change Of Control |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |
Unrealized gain on E.ON contingent obligation | 16,075 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
E.ON Contingent Obligation, Principal | (12,902) |  | (12,902) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
E.ON Contingent Obligation, Accrued Interest | (3,173) |  | (2,467) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
E.ON Contingent Obligation, Derivative Asset | $ 16,075 |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[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 June 30, 2013 was 0.26%.
[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 4 Fair value measurements for additional information.

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- Definition This amount represents the accrued interest on the E.ON contingent obligation, which is defined as the 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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