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Fair Value Measurements - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
custodian
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
custodian
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
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 $ 24,846 $ (15,249) $ (22,942) $ (31,974)  
Number of third party custodians held by platform operator of safeguarding assets | custodian 2   2    
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 $ 22,861   $ 22,861   $ 22,825
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   $ 19,739