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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
(Loss) Gain on Securities [Line Items] |  |  |  |
Gain (Loss) on Securities, net | $ 6,245 | $ 13,828 | $ 7,624 | $ (2,012)
Investments—Consolidated Investment Companies |  |  |  |
(Loss) Gain on Securities [Line Items] |  |  |  |
Net Unrealized Gains (Losses) | 1,098 | 9,889 | (805) | (464)
Net Realized Gains (Losses) | 341 | (1,108) | 1,602 | (1,104)
Gain (Loss) on Securities, net | 1,439 | 8,781 | 797 | (1,568)
Investments—Affiliates and Other |  |  |  |
(Loss) Gain on Securities [Line Items] |  |  |  |
Net Unrealized Gains (Losses) | 1,665 | 4,991 | 3,247 | (406)
Net Realized Gains (Losses) | 3,141 | 56 | 3,580 | (38)
Gain (Loss) on Securities, net | $ 4,806 | $ 5,047 | $ 6,827 | $ (444)

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- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition Amount of unrealized gain (loss) on investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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