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Investments - Narrative (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 25, 2017 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) investment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Non-cash exchange of available-for-sale debt securities |  | $ 18,300,000 |  |  |
Gain (loss) on investments |  | $ (4,400,000) | $ (20,991,000) | $ (4,211,000) | $ (73,000)
Impairment loss on equity securities without readily determinable fair value |  |  | 19,605,000 | 4,164,000 |
Equity securities, cumulative impairment loss |  |  | 23,800,000 |  |
Other-than-temporary impairment losses recognized on debt securities |  |  | 0 | 0 | 0
Variable interest entity, amount committed to invest | $ 200,000,000 |  |  |  |
Variable interest entity, ownership percentage | 76.60% |  |  |  |
Annual management fee percentage | 2.00% |  |  |  |
Management fee annual reduction percentage | 10.00% |  |  |  |
Entitled carried interest percentage | 20.00% |  |  |  |
Net investment income (loss) |  |  | (11,338,000) | (168,000) | (4,140,000)
Variable interest entity, amount of capital call notices received |  |  | 32,900,000 | 29,600,000 |
Variable interest entity, amount paid |  |  | 31,900,000 | 29,600,000 |
Distribution from equity method investment |  |  | 0 | 10,288,000 | 0
Management fees recognized |  |  | 3,000,000.0 | $ 3,000,000.0 | $ 4,500,000
COVID-19 |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Net investment income (loss) |  |  | $ (4,300,000) |  |
Number of investments impaired | investment |  |  | 2 |  |
Equity method investment, impairment |  |  | $ 7,000,000.0 |  |

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