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Debt (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Senior secured notes due May 15, 2014 [Member]
Jun. 30, 2012
Senior unsecured notes due August 15, 2014 [Member]
Jun. 30, 2012
Line of Credit [Member]
Jun. 30, 2012
Current [Member]
Industrial revenue bonds due 2028 [Member]
Dec. 31, 2011
Current [Member]
Industrial revenue bonds due 2028 [Member]
Jun. 30, 2012
Long-Term [Member]
Senior secured notes due May 15, 2014 [Member]
Dec. 31, 2011
Long-Term [Member]
Senior secured notes due May 15, 2014 [Member]
Jun. 30, 2012
Long-Term [Member]
Senior unsecured notes due August 15, 2014 [Member]
Dec. 31, 2011
Long-Term [Member]
Senior unsecured notes due August 15, 2014 [Member]
Jun. 30, 2012
Long-Term [Member]
Contingent obligation [Member]
Dec. 31, 2011
Long-Term [Member]
Contingent obligation [Member]
Debt Instrument [Line Items]                          
Debt $ 272,514 $ 271,285       $ 7,815 [1] $ 7,815 [1] $ 247,433 $ 246,909 $ 2,603 $ 2,603 $ 14,663 [2] $ 13,958 [2]
Variable interest rates, maximum (as a percent)           12.00% 12.00%            
Interest rate (as a percent)     8.00% 7.50%   0.43%   8.00% 8.00% 7.50% 7.50% 10.94% 10.94%
Maturity date           Apr. 01, 2028 Apr. 01, 2028 May 15, 2014 May 15, 2014 Aug. 15, 2014 Aug. 15, 2014 Dec. 31, 2028 Dec. 31, 2028
Net of debt discount               2,438 2,695        
Term of credit facility 4 years                        
Senior secured revolving credit facility amount         100,000                
Borrowing availability, net of outstanding letters of credit         57,981                
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         $ 42,019                
[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, 2012 was 0.43%.
[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.