Investments - Gains and Losses Recognized in Gain (Loss) on Securities, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
(Loss) Gain on Securities [Line Items]
Net Unrealized Gains (Losses)			$ 7,466	$ 1,920
Gain (Loss) on Securities, net	$ 7,935	$ (3,438)	8,826	2,094
Investments | Investments—Consolidated Investment Companies
(Loss) Gain on Securities [Line Items]
Net Unrealized Gains (Losses)	4,433	(1,680)	2,296	2,582
Net Realized Gains (Losses)	20	(125)	(204)	(1,101)
Gain (Loss) on Securities, net	4,453	(1,805)	2,092	1,481
Investments | Investments—Affiliates and Other
(Loss) Gain on Securities [Line Items]
Net Unrealized Gains (Losses)	2,035	(1,518)	5,170	(662)
Net Realized Gains (Losses)	1,447	(115)	1,564	1,275
Gain (Loss) on Securities, net	$ 3,482	$ (1,633)	$ 6,734	$ 613