SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of investments in the VIE (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Securities and other investments owned, at fair value	$ 1,238,613	$ 1,532,095
Other assets	34,497	11,525
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Securities and other investments owned, at fair value	35,291	27,445
Loans receivable, at fair value	70,400	205,265
Other assets	3,129	4,956
Maximum exposure to loss	$ 108,820	$ 237,666