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Investments - Gains and Losses Recognized in Gain (Loss) on Securities, Net (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
(Loss) Gain on Securities [Line Items] |  |
Net Unrealized Gains (Losses) | $ 5,974 | $ (11,847)
Gain (Loss) on Securities, net | 5,492 | (11,695)
Investments—Consolidated Investment Companies |  |
(Loss) Gain on Securities [Line Items] |  |
Net Unrealized Gains (Losses) | 3,621 | (5,188)
Net Realized Gains (Losses) | (641) | (462)
Gain (Loss) on Securities, net | 2,980 | (5,650)
Investments—Affiliates and Other |  |
(Loss) Gain on Securities [Line Items] |  |
Net Unrealized Gains (Losses) | 2,353 | (6,659)
Net Realized Gains (Losses) | 159 | 614
Gain (Loss) on Securities, net | $ 2,512 | $ (6,045)

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- Definition Amount of realized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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