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Securitizations (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Securitizations [Line Items]        
Receivables Securitized $ 1,372,044 $ 954,915 $ 5,721,379 $ 3,872,703
Proceeds from Securitizations of Consumer Loans 1,300,000 900,000 5,400,000 3,650,000
Contractually Specified Servicing Fees, Amount 60,634 49,676 178,434 147,585
Net distributions from Trusts $ 267,379 $ 202,647 $ 1,183,034 $ 636,903