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Investments - Gains and Losses Recognized in Gain (Loss) on Securities, Net (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
(Loss) Gain on Securities [Line Items] |  |
Net Unrealized Gains (Losses) | $ 1,334 | $ 5,974
Gain (Loss) on Securities, net | 1,747 | 5,492
Investments | Investments—Consolidated Investment Companies |  |
(Loss) Gain on Securities [Line Items] |  |
Net Unrealized Gains (Losses) | (7) | 3,621
Net Realized Gains (Losses) | (186) | (641)
Gain (Loss) on Securities, net | (193) | 2,980
Investments | Investments—Affiliates and Other |  |
(Loss) Gain on Securities [Line Items] |  |
Net Unrealized Gains (Losses) | 1,341 | 2,353
Net Realized Gains (Losses) | 599 | 159
Gain (Loss) on Securities, net | $ 1,940 | $ 2,512

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