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Debt (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Industrial revenue bonds $ 7,815 $ 7,815
Current portion of long-term debt 2,603 0
Revolving credit facility 6,000 0
E.ON Contingent Obligation 0 15,369
Debt 262,946 273,766
Principal payments on long term debt 8,603  
Industrial revenue bonds due 2028 [Member] | Short-term Debt [Member]
    
Debt Instrument [Line Items]    
Industrial revenue bonds 7,815 [1] 7,815 [1]
Variable interest rates, maximum (as a percent) 12.00% 12.00%
Interest rate (as a percent) 0.25%  
Maturity date Apr. 01, 2028 Apr. 01, 2028
Net of debt discount 0 0
Senior unsecured notes due August 15, 2014 [Member]
    
Debt Instrument [Line Items]    
Interest rate (as a percent) 7.50%  
Senior unsecured notes due August 15, 2014 [Member] | Long-term Debt [Member]
    
Debt Instrument [Line Items]    
Unsecured Long-term Debt, Noncurrent 0 2,603
Interest rate (as a percent) 0.00% 7.50%
Maturity date   Aug. 15, 2014
Net of debt discount 0 0
Senior unsecured notes due August 15, 2014 [Member] | Short-term Debt [Member]
    
Debt Instrument [Line Items]    
Current portion of long-term debt 2,603 [2] 0 [2]
Interest rate (as a percent) 7.50% 0.00%
Maturity date Aug. 15, 2014  
Net of debt discount 0 0
Principal payments on long term debt 2,603  
Senior secured notes due June 01, 2021 [Member]
    
Debt Instrument [Line Items]    
Interest rate (as a percent) 7.50%  
Senior secured notes due June 01, 2021 [Member] | Long-term Debt [Member]
    
Debt Instrument [Line Items]    
Secured Long-term Debt, Noncurrent 246,528 0
Interest rate (as a percent) 7.50% 0.00%
Maturity date Jun. 01, 2021  
Net of debt discount 3,472 0
Senior secured notes due May 15, 2014 [Member]
    
Debt Instrument [Line Items]    
Interest rate (as a percent) 8.00%  
Senior secured notes due May 15, 2014 [Member] | Long-term Debt [Member]
    
Debt Instrument [Line Items]    
Secured Long-term Debt, Noncurrent 0 247,979
Interest rate (as a percent) 0.00% 8.00%
Maturity date   May 15, 2014
Net of debt discount 0 1,625
Contingent obligation [Member]
    
Debt Instrument [Line Items]    
E.ON Contingent Obligation 0 (15,369)
Contingent obligation [Member] | Long-term Debt [Member]
    
Debt Instrument [Line Items]    
E.ON Contingent Obligation 0 [3] 15,369 [3]
Interest rate (as a percent) 10.94% 10.94%
Maturity date Dec. 31, 2028 Dec. 31, 2028
Net of debt discount 0 0
Iceland revolving credit facility [Member] | Short-term Debt [Member]
    
Debt Instrument [Line Items]    
Revolving credit facility 6,000 [2],[4] 0 [2],[4]
Interest rate (as a percent) 3.92%  
Principal payments on long term debt $ 6,000  
[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 December 31, 2013 was 0.25%.
[2] These items are recorded in Accrued and other current liabilities.
[3] 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.
[4] Borrowings under the Iceland revolving credit facility bear variable interest based on LIBOR plus the applicable margin per annum. The interest rate at December 31, 2013 was 3.92%.