Consolidation - Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Noncontrolling interests	$ (110,399)	$ (106,630)	$ (113,718)	$ (139,147)	$ (138,738)	$ (138,965)
VOEs
Variable Interest Entity [Line Items]
Cash and cash equivalents	906		1,153
Investments	23,222		24,669
Other assets	180		295
Notes payable	0		0
Securities purchased payable and other liabilities	(662)		(573)
Noncontrolling interests	(7,816)		(7,879)
Net interests in CIP	15,830		17,665
CLOs
Variable Interest Entity [Line Items]
Cash and cash equivalents	153,549		249,003
Investments	1,933,812		2,106,764
Other assets	23,545		43,993
Notes payable	(1,911,579)		(2,083,314)
Securities purchased payable and other liabilities	(108,794)		(230,141)
Noncontrolling interests	(5,196)		(5,917)
Net interests in CIP	85,337		80,388
Other
Variable Interest Entity [Line Items]
Cash and cash equivalents	1,762		789
Investments	67,952		58,680
Other assets	1,555		1,157
Notes payable	0		0
Securities purchased payable and other liabilities	(807)		(183)
Noncontrolling interests	(14,993)		(10,389)
Net interests in CIP	$ 55,469		$ 50,054