Consolidation - Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Noncontrolling interests	$ (138,738)	$ (138,965)	$ (112,482)	$ (115,513)
VOEs
Variable Interest Entity [Line Items]
Cash and cash equivalents	812	787
Investments	15,639	21,544
Other assets	91	64
Notes payable	0	0
Securities purchased payable and other liabilities	(500)	(558)
Noncontrolling interests	(2,186)	(4,935)
Net interests in CIP	13,856	16,902
CLOs
Variable Interest Entity [Line Items]
Cash and cash equivalents	108,396	205,192
Investments	2,043,030	2,055,107
Other assets	28,334	43,327
Notes payable	(1,978,420)	(2,033,617)
Securities purchased payable and other liabilities	(120,336)	(184,214)
Noncontrolling interests	(7,806)	(8,350)
Net interests in CIP	73,198	77,445
Other
Variable Interest Entity [Line Items]
Cash and cash equivalents	1,537	1,245
Investments	59,939	63,587
Other assets	832	819
Notes payable	0	0
Securities purchased payable and other liabilities	(510)	(296)
Noncontrolling interests	(7,247)	(7,481)
Net interests in CIP	$ 54,551	$ 57,874