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Securitizations Net - Summary of Outstanding Balance Net of Discounts and Deals Costs of Securities and Effective Interest Rate (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |
Securitizations, net | $ 1,558,163 | $ 1,599,719 | $ 1,579,019
Average outstanding balance | $ 1,545,969 | $ 1,565,754 |
Effective interest rate | 4.83% | 4.74% |
Securitizations |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense - portfolio related | $ 37,333 | $ 37,104 |

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