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Securitizations and Variable Interest Entities - Schedule Of Carrying Value and Classification of Assets and Liabilities of Advance Financing Facilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Debt service accounts $ 15,930   $ 15,868
Prepaid lender fees, net 7,071 $ 9,556  
Advance match funded liabilities (related to VIEs) 550,437 581,288  
Variable Interest Entity, Primary Beneficiary | Advance Match Funded Liabilities      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Match funded advances (Advances, net) 623,570 651,576  
Debt service accounts 7,186 14,195  
Prepaid lender fees, net 2,957 4,253  
Prepaid Interest 263 291  
Advance match funded liabilities (related to VIEs) $ 550,437 $ 581,288