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Investments - Gains and Losses Recognized in Gain (Loss) on Securities, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Gain (Loss) on Securities [Line Items] |  |  |
Net Unrealized Gains (Losses) | $ 13,423 | $ (24,383) | $ 1,965
Gain (Loss) on Securities, net | 13,181 | (28,696) | 9,532
Investments | Investments—Consolidated Investment Companies |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net Unrealized Gains (Losses) | 8,969 | (7,896) | 642
Net Realized Gains (Losses) | (1,734) | (7,333) | 1,609
Gain (Loss) on Securities, net | 7,235 | (15,229) | 2,251
Investments | Receivables - Affiliates and Other |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net Unrealized Gains (Losses) | 4,454 | (16,487) | 1,323
Net Realized Gains (Losses) | 1,492 | 3,020 | 5,958
Gain (Loss) on Securities, net | $ 5,946 | $ (13,467) | $ 7,281

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