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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
(Loss) Gain on Securities [Line Items] |  |  |  |
Gain (Loss) on Securities, net | $ 13,828 | $ 577 | $ (2,012) | $ 2,256
Investments—Consolidated Investment Companies |  |  |  |
(Loss) Gain on Securities [Line Items] |  |  |  |
Unrealized Gains (Losses) | 9,889 | 424 | (464) | 1,709
Net Realized Gains (Losses) | (1,108) | (206) | (1,104) | (667)
Gain (Loss) on Securities, net | 8,781 | 218 | (1,568) | 1,042
Investments—Affiliates and Other |  |  |  |
(Loss) Gain on Securities [Line Items] |  |  |  |
Unrealized Gains (Losses) | 4,991 | 340 | (406) | 1,217
Net Realized Gains (Losses) | 56 | 19 | (38) | (3)
Gain (Loss) on Securities, net | $ 5,047 | $ 359 | $ (444) | $ 1,214

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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=121586364&loc=d3e3602-108585 + Details
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- Definition Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI). + References No definition available. + 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=120395209&loc=SL114868664-224227 + Details
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