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Loan Securitization (Narrative) (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 11, 2009
Aug. 15, 2012
Class A [Member]
Aug. 15, 2012
Class B and C [Member]
Dec. 31, 2012
Restricted Assets and Liabilities [Member]
Debt Instrument [Line Items]              
Instruments issued by the securitization entity       $ 600,000,000      
Class A notes annual interest rate of one-month LIBOR plus       1.45%      
Company repurchased notes 239,200,000       360,800,000 49,600,000  
Secured borrowings - owed to securitization investors 0 360,800,000 600,000,000       0
Proceeds from secured debt intercompany         239,200,000    
Cash collateral             $ 36,000