Consolidation - Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Noncontrolling interests	$ (129,450)	$ (115,185)	$ (104,869)	$ (110,399)	$ (106,630)	$ (113,718)
VOEs
Variable Interest Entity [Line Items]
Cash and cash equivalents	8,576		1,223
Investments	46,317		30,985
Other assets	1,255		174
Notes payable	0		0
Securities purchased payable and other liabilities	(772)		(740)
Noncontrolling interests	(17,880)		(7,316)
Net interests in CIP	37,496		24,326
CLOs
Variable Interest Entity [Line Items]
Cash and cash equivalents	156,822		98,101
Investments	1,988,364		1,972,342
Other assets	37,022		41,985
Notes payable	(1,990,338)		(1,922,243)
Securities purchased payable and other liabilities	(99,797)		(89,167)
Noncontrolling interests	(3,443)		(4,363)
Net interests in CIP	88,630		96,655
GFs
Variable Interest Entity [Line Items]
Cash and cash equivalents	2,298		2,088
Investments	71,978		79,386
Other assets	910		1,076
Notes payable	0		0
Securities purchased payable and other liabilities	(1,557)		(616)
Noncontrolling interests	(26,833)		(23,327)
Net interests in CIP	$ 46,796		$ 58,607