Consolidation - Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Noncontrolling interests	$ (104,869)	$ (113,718)	$ (138,965)	$ (115,513)
VOEs
Variable Interest Entity [Line Items]
Cash and cash equivalents	1,223	1,153
Investments	30,985	24,669
Other assets	174	295
Notes payable	0	0
Securities purchased payable and other liabilities	(740)	(573)
Noncontrolling interests	(7,316)	(7,879)
Net interests in CIP	24,326	17,665
CLOs
Variable Interest Entity [Line Items]
Cash and cash equivalents	98,101	249,003
Investments	1,972,342	2,106,764
Other assets	41,985	43,993
Notes payable	(1,922,243)	(2,083,314)
Securities purchased payable and other liabilities	(89,167)	(230,141)
Noncontrolling interests	(4,363)	(5,917)
Net interests in CIP	96,655	80,388
GFs
Variable Interest Entity [Line Items]
Cash and cash equivalents	2,088	789
Investments	79,386	58,680
Other assets	1,076	1,157
Notes payable	0	0
Securities purchased payable and other liabilities	(616)	(183)
Noncontrolling interests	(23,327)	(10,389)
Net interests in CIP	$ 58,607	$ 50,054