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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Gain (Loss) on Securities [Line Items] |  |  |
Net Unrealized Gains (Losses) | $ (24,383) | $ 1,965 | $ 19,403
Gain (Loss) on Securities, net | (28,696) | 9,532 | 18,067
Investments—Consolidated Investment Companies |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net Unrealized Gains (Losses) | (7,896) | 642 | 13,862
Net Realized Gains (Losses) | (7,333) | 1,609 | (1,352)
Gain (Loss) on Securities, net | (15,229) | 2,251 | 12,510
Investments—Affiliates and Other |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net Unrealized Gains (Losses) | (16,487) | 1,323 | 5,541
Net Realized Gains (Losses) | 3,020 | 5,958 | 16
Gain (Loss) on Securities, net | $ (13,467) | $ 7,281 | $ 5,557

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