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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.