INVESTMENTS - Investment Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Schedule of Equity Method Investments [Line Items]
Other investments, at fair value	$ 14,005	$ 25,603
Total investment income	18,240	51,722
Funds
Schedule of Equity Method Investments [Line Items]
Equity-method investments:	4,612	26,122
Companies
Schedule of Equity Method Investments [Line Items]
Equity-method investments:	$ (377)	$ (3)