Consolidation - Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Noncontrolling interests	$ (115,185)	$ (104,869)	$ (106,630)	$ (113,718)
VOEs
Variable Interest Entity [Line Items]
Cash and cash equivalents	1,271	1,223
Investments	40,591	30,985
Other assets	616	174
Notes payable	0	0
Securities purchased payable and other liabilities	(1,019)	(740)
Noncontrolling interests	(12,311)	(7,316)
Net interests in CIP	29,148	24,326
CLOs
Variable Interest Entity [Line Items]
Cash and cash equivalents	119,914	98,101
Investments	1,962,697	1,972,342
Other assets	30,064	41,985
Notes payable	(1,922,051)	(1,922,243)
Securities purchased payable and other liabilities	(88,270)	(89,167)
Noncontrolling interests	(4,351)	(4,363)
Net interests in CIP	98,003	96,655
GFs
Variable Interest Entity [Line Items]
Cash and cash equivalents	2,612	2,088
Investments	77,937	79,386
Other assets	1,168	1,076
Notes payable	0	0
Securities purchased payable and other liabilities	(1,999)	(616)
Noncontrolling interests	(22,878)	(23,327)
Net interests in CIP	$ 56,840	$ 58,607