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Investments - Gains and Losses Recognized in Gain (Loss) on Securities, Net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
(Loss) Gain on Securities [Line Items]        
Net Unrealized Gains (Losses)     $ 13,730 $ 7,466
Gain (Loss) on Securities, net $ 7,632 $ 7,935 19,807 8,826
Investments | Investments—Consolidated Investment Companies        
(Loss) Gain on Securities [Line Items]        
Net Unrealized Gains (Losses) 1,149 4,433 7,902 2,296
Net Realized Gains (Losses) 674 20 2,625 (204)
Gain (Loss) on Securities, net 1,823 4,453 10,527 2,092
Investments | Investments—Affiliates and Other        
(Loss) Gain on Securities [Line Items]        
Net Unrealized Gains (Losses) 3,638 2,035 5,828 5,170
Net Realized Gains (Losses) 2,171 1,447 3,452 1,564
Gain (Loss) on Securities, net $ 5,809 $ 3,482 $ 9,280 $ 6,734