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Investments - Gains and Losses Recognized in Gain (Loss) on Securities, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
(Loss) Gain on Securities [Line Items] |  |  |  |
Net Unrealized Gains (Losses) |  |  | $ (33,315) | $ 2,442
Gain (Loss) on Securities, net | $ (20,885) | $ 6,245 | (32,580) | 7,624
Investments—Consolidated Investment Companies |  |  |  |
(Loss) Gain on Securities [Line Items] |  |  |  |
Net Unrealized Gains (Losses) | (12,395) | 1,098 | (17,583) | (805)
Net Realized Gains (Losses) | (1,016) | 341 | (1,478) | 1,602
Gain (Loss) on Securities, net | (13,411) | 1,439 | (19,061) | 797
Investments—Affiliates and Other |  |  |  |
(Loss) Gain on Securities [Line Items] |  |  |  |
Net Unrealized Gains (Losses) | (9,073) | 1,665 | (15,732) | 3,247
Net Realized Gains (Losses) | 1,599 | 3,141 | 2,213 | 3,580
Gain (Loss) on Securities, net | $ (7,474) | $ 4,806 | $ (13,519) | $ 6,827

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