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FAIR VALUE MEASUREMENTS - Summary of Activity In Marketable Securities (Details) - Residual interest securities - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Change in fair value | $ 133 |  | $ 10,368
Level 3 |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Beginning Balance | 34,506 | $ 11,952 | 11,952
Purchases | 12,333 | 16,527 |
Sales |  | (872) |
Principal payments | (9,430) | (1,002) |
Change in fair value | 897 | 870 |
Ending Balance | $ 38,306 | $ 27,475 | $ 34,506

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