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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