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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Gain (loss) included in earnings from changes in instrument-specific credit risk $ 40,824 $ (50,529)  
Fair Value | Fair Value, Nonrecurring | Non-Securitization Investments – Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of non-securitization investments, other 23,085   $ 22,920
Fair Value | Fair Value, Nonrecurring | Other Security Investments, Investment Four | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of non-securitization investments, other $ 19,739   $ 19,739