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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
(Loss) Gain on Securities [Line Items] |  |  |  |
Net Unrealized Gains (Losses) |  |  | $ (35,425) | $ (27)
Gain (Loss) on Securities, net | $ (6,825) | $ (644) | (39,406) | 6,980
Investments—Consolidated Investment Companies |  |  |  |
(Loss) Gain on Securities [Line Items] |  |  |  |
Net Unrealized Gains (Losses) | 1,137 | (391) | (16,446) | (1,197)
Net Realized Gains (Losses) | (4,568) | 184 | (6,047) | 1,786
Gain (Loss) on Securities, net | (3,431) | (207) | (22,493) | 589
Investments—Affiliates and Other |  |  |  |
(Loss) Gain on Securities [Line Items] |  |  |  |
Net Unrealized Gains (Losses) | (3,248) | (2,077) | (18,979) | 1,170
Net Realized Gains (Losses) | (146) | 1,640 | 2,066 | 5,221
Gain (Loss) on Securities, net | $ (3,394) | $ (437) | $ (16,913) | $ 6,391

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