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Debt (Non-Recourse Notes) (Details) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Aug. 31, 2009
16% Non-Recourse Notes [member]
Sep. 30, 2010
16% Non-Recourse Notes [member]
Jun. 30, 2011
16% Non-Recourse Notes [member]
Aug. 26, 2008
16% Non-Recourse Notes [member]
Non-recourse notes, aggregate principal amount $ 379,500,000 $ 379,500,000 $ 379,500,000 $ 105,000,000     $ 105,000,000
Non-recourse notes, interest rate             16.00%
Notes, maturity date Nov. 05, 2024
Fair value of non-recourse, secured promissory notes             115,200,000
Debt instrument, face amount             105,000,000
Percentage of principal amount of Non-recourse notes purchased       46.00%      
Loss on extinguishment of debt 8,548,000 8,548,000       4,000,000  
Redeemable option, principal amount         57,000,000    
Redeemable percentage         108.00%    
Redeemable amount         $ 62,000,000