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Investments - Narrative (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 25, 2017 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) investment | Dec. 31, 2020 USD ($) investment | Dec. 31, 2019 USD ($)
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Non-cash exchange of available-for-sale debt securities |  | $ 18,300,000 |  |  |
Loss on investments, net |  | $ 4,400,000 |  |  |
Impairment loss on equity securities without readily determinable fair value |  |  | $ 16,677,000 | $ 19,605,000 |
Proceeds from sale of equity securities without readily determinable fair value |  |  | 14,300,000 |  |
Realized loss on securities |  |  | 300,000 |  |
Equity securities, cumulative impairment loss |  |  | $ 40,500,000 | 23,800,000 |
Number of investments in an unrealized loss position | investment |  |  | 0 |  |
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% |  |  |  |
Fund investment period | 6 years |  |  |  |
Variable interest entity, amount of capital call notices received |  |  | 22,200,000 | 32,900,000 |
Variable interest entity, amount paid |  |  | 22,200,000 | 31,900,000 |
Distribution from equity method investment |  |  | 15,327,000 | 0 | 10,288,000
Net investment income (loss) |  |  | 35,845,000 | (11,338,000) | (168,000)
Management fees recognized |  |  | $ 3,000,000 | 3,000,000 | $ 3,000,000
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 |

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