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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

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