Consolidation - Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Noncontrolling interests	$ (106,630)	$ (113,718)	$ (138,738)	$ (138,965)
VOEs
Variable Interest Entity [Line Items]
Cash and cash equivalents	936	1,153
Investments	21,336	24,669
Other assets	388	295
Notes payable	0	0
Securities purchased payable and other liabilities	(906)	(573)
Noncontrolling interests	(6,492)	(7,879)
Net interests in CIP	15,262	17,665
CLOs
Variable Interest Entity [Line Items]
Cash and cash equivalents	201,987	249,003
Investments	2,025,673	2,106,764
Other assets	47,694	43,993
Notes payable	(2,056,472)	(2,083,314)
Securities purchased payable and other liabilities	(126,085)	(230,141)
Noncontrolling interests	(6,382)	(5,917)
Net interests in CIP	86,415	80,388
Other
Variable Interest Entity [Line Items]
Cash and cash equivalents	1,830	789
Investments	61,729	58,680
Other assets	989	1,157
Notes payable	0	0
Securities purchased payable and other liabilities	(381)	(183)
Noncontrolling interests	(11,927)	(10,389)
Net interests in CIP	$ 52,240	$ 50,054