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Securitized Debt and Securitized Debt at Fair Value - Summary of Securitized Debt and Securitized Debt at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Securitization or Asset-Backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]    
Securitized debt, net $ 2,504,334 $ 2,736,290
Securitized debt at fair value 669,139  
Total securitized debt 3,173,473 2,736,290
Securitized debt    
Securitization or Asset-Backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]    
Securitized debt, net 2,546,709  
Securitized debt at fair value 690,371  
Total securitized debt 3,237,080  
Unpaid Principal Balance    
Securitization or Asset-Backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]    
Securitized debt, net   2,788,908
Total securitized debt   2,788,908
Valuation Adjustments on FVO Securitized Debt    
Securitization or Asset-Backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]    
Securitized debt at fair value (21,232)  
Total securitized debt (21,232)  
Deferred Issuance Costs and Discounts    
Securitization or Asset-Backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]    
Securitized debt, net (42,375) (52,618)
Total securitized debt $ (42,375) $ (52,618)