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Investments - Gains and Losses Recognized in Gain (Loss) on Securities, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Gain (Loss) on Securities [Line Items] |  |  |
Gain (Loss) on Securities, net | $ 18,067 | $ 4,966 | $ (4,357)
Investments—Consolidated Investment Companies |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Unrealized Gains (Losses) | 13,862 | 4,759 | (3,142)
Net Realized Gains (Losses) | (1,352) | (1,243) | (374)
Gain (Loss) on Securities, net | 12,510 | 3,516 | (3,516)
Investments—Affiliates and Other |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Unrealized Gains (Losses) | 5,541 | 2,156 | (1,180)
Net Realized Gains (Losses) | 16 | (706) | 339
Gain (Loss) on Securities, net | $ 5,557 | $ 1,450 | $ (841)

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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