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Debt Debt (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Schedule of Debt Instruments [Line Items] |  |  |  |
Industrial revenue bonds | $ 7,815 |  | $ 7,815 |
Current portion of long-term debt | 2,603 |  | 0 |
Revolving credit facility | 16,725 |  | 0 |
TOTAL | 273,585 |  | 273,766 |
Industrial revenue bonds due 2028 [Member] | Short-term Debt [Member] |  |  |  |
Schedule of Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Unamortized Discount | 0 | [1] | 0 | [1]
Debt Instrument, Maturity Date | Apr. 01, 2028 | [1] | Apr. 01, 2028 | [1]
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum | 12.00% | [1] | 12.00% | [1]
Industrial revenue bonds | 7,815 | [1] | 7,815 | [1]
Debt Instrument, Interest Rate, Stated Percentage | 0.27% |  |  |
Senior secured notes due June 01, 2021 [Member] | Long-term Debt [Member] |  |  |  |
Schedule of Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Unamortized Discount | 3,558 |  | 0 |
Debt Instrument, Maturity Date | Jun. 01, 2021 |  |  |
Secured Long-term Debt, Noncurrent | 246,442 |  | 0 |
Debt Instrument, Interest Rate, Stated Percentage | 7.50% |  | 0.00% |
Senior secured notes due May 15, 2014 [Member] | Long-term Debt [Member] |  |  |  |
Schedule of Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Unamortized Discount | 0 |  | 1,625 |
Debt Instrument, Maturity Date |  |  | May 15, 2014 |
Secured Long-term Debt, Noncurrent | 0 |  | 247,979 |
Debt Instrument, Interest Rate, Stated Percentage | 0.00% |  | 8.00% |
Senior unsecured notes due August 15, 2014 [Member] |  |  |  |
Schedule of Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.50% |  |  |
Senior unsecured notes due August 15, 2014 [Member] | Long-term Debt [Member] |  |  |  |
Schedule of Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Unamortized Discount | 0 |  | 0 |
Debt Instrument, Maturity Date |  |  | Aug. 15, 2014 |
Unsecured Long-term Debt, Noncurrent | 0 |  | 2,603 |
Debt Instrument, Interest Rate, Stated Percentage | 0.00% |  | 7.50% |
Senior unsecured notes due August 15, 2014 [Member] | Short-term Debt [Member] |  |  |  |
Schedule of Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Unamortized Discount | 0 |  | 0 |
Debt Instrument, Maturity Date | Aug. 15, 2014 |  |  |
Current portion of long-term debt | 2,603 |  | 0 |
Debt Instrument, Interest Rate, Stated Percentage | 7.50% |  | 0.00% |
Contingent obligation [Member] |  |  |  |
Schedule of Debt Instruments [Line Items] |  |  |  |
E.ON Contingent Obligation | 0 |  | (15,369) |
Contingent obligation [Member] | Long-term Debt [Member] |  |  |  |
Schedule of Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Unamortized Discount | 0 | [2] | 0 | [2]
Debt Instrument, Maturity Date | Dec. 31, 2028 | [2] | Dec. 31, 2028 | [2]
E.ON Contingent Obligation | 0 | [2] | 15,369 | [2]
Debt Instrument, Interest Rate, Stated Percentage | 10.94% | [2] | 10.94% | [2]
Revolving Credit Facility [Member] | Long-term Debt [Member] |  |  |  |
Schedule of Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Term | 5 years |  |  |
Revolving credit facility | $ 16,725 | [3] | $ 0 | [3]
[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 September 30, 2013 was 0.27%.
[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.
[3] | Borrowings under the revolving line of credit bear interest, at our option, at LIBOR or a base rate, plus, in each case, an applicable interest margin. The applicable interest margin is determined based on the average daily availability for the immediately preceding quarter.

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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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- Definition Carrying value as of the balance sheet date of the long-term debt associated with industrial revenue bonds. For classified balance sheets, these bonds are considered current assets because they are remarketed weekly and the bonds could be required to be repaid upon demand if there is a failed remarketing. + References No definition available. + Details
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