Investments - Gains and Losses Recognized in Gain (Loss) on Securities, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Gain (Loss) on Securities [Line Items]
Net Unrealized Gains (Losses)	$ 3,929	$ 13,423	$ (24,383)
Gain (Loss) on Securities, net	6,603	13,181	(28,696)
Investments | Investments—Consolidated Investment Companies
Gain (Loss) on Securities [Line Items]
Net Unrealized Gains (Losses)	589	8,969	(7,896)
Net Realized Gains (Losses)	538	(1,734)	(7,333)
Gain (Loss) on Securities, net	1,127	7,235	(15,229)
Investments | Receivables—Affiliates and Other
Gain (Loss) on Securities [Line Items]
Net Unrealized Gains (Losses)	3,340	4,454	(16,487)
Net Realized Gains (Losses)	2,136	1,492	3,020
Gain (Loss) on Securities, net	$ 5,476	$ 5,946	$ (13,467)