FAIR VALUE MEASUREMENTS - Fair Value Liabilities Measured at Fair Value on a Recurring Basis using Level 3 Inputs (Details) - Recurring Basis - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Asset-Backed Securities Issued
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 632,400
Purchases, sales and payments
Ending balance	554,800	$ 632,400
Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	319,486	511,107
Gains (losses) included in net income
Other income	4,971	(34,647)
Purchases, sales and payments
Purchases	218,746
Payments	(89,276)	(156,974)
Ending balance	453,927	319,486
Level 3 | Asset-Backed Securities Issued
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	319,486	511,107
Gains (losses) included in net income
Other income	5,560	(34,647)
Purchases, sales and payments
Purchases	0
Payments	(89,276)	(156,974)
Ending balance	235,770	319,486
Level 3 | Notes Payable of Consolidated Funds
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	0
Gains (losses) included in net income
Other income	(589)	0
Purchases, sales and payments
Purchases	218,746
Payments	0	0
Ending balance	$ 218,157	$ 0