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Securitization Notes Payable Securitization Notes Payable (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Debt Instrument [Line Items]      
Amortization of Debt Discount (Premium) $ (4,521,000) $ (9,944,000)  
Purchase Price Premium, Unamortized 6,600,000    
Unamortized Debt Issuance - Securitization Notes Payable 26,000,000   26,100,000
Securitization Notes Payable [Member]
     
Debt Instrument [Line Items]      
Amortization of Debt Discount (Premium) $ 4,500,000 $ 9,800,000