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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
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
(Loss) Gain on Securities [Line Items] |  |  |  |
Net Unrealized Gains (Losses) |  |  | $ 5,118 | $ (33,315)
Gain (Loss) on Securities, net | $ 40 | $ (20,885) | 5,533 | (32,580)
Investments | Consolidated Investment Companies |  |  |  |
(Loss) Gain on Securities [Line Items] |  |  |  |
Net Unrealized Gains (Losses) | 641 | (12,395) | 4,262 | (17,583)
Net Realized Gains (Losses) | (335) | (1,016) | (975) | (1,478)
Gain (Loss) on Securities, net | 306 | (13,411) | 3,287 | (19,061)
Investments | Affiliates |  |  |  |
(Loss) Gain on Securities [Line Items] |  |  |  |
Net Unrealized Gains (Losses) | (1,496) | (9,073) | 856 | (15,732)
Net Realized Gains (Losses) | 1,230 | 1,599 | 1,390 | 2,213
Gain (Loss) on Securities, net | $ (266) | $ (7,474) | $ 2,246 | $ (13,519)

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