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Investments (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 25, 2017 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) investment
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Loss on investments, net |  | $ 0 | $ 16,700 | $ 156 | $ 16,677 | $ 20,991 | $ 3,800
Impairment loss on equity securities without readily determinable fair value |  |  |  |  | 16,677 | 19,600 | $ 19,605
Recognized loss on exchange of available-for-sale debt securities |  |  |  |  |  | 4,400 |
Gain on purchase of preferred stock |  |  |  |  |  | 3,200 |
Purchase of preferred stock |  |  |  |  |  | 800 |
Cumulative impairment losses |  | 40,500 |  |  | $ 40,500 |  |
Variable interest entity, amount committed to invest | $ 200,000 |  |  |  |  |  |
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% |  |  |  |  |  |
Investment period |  |  |  |  | 6 years |  |
Variable interest entity, amount of capital call notices received |  |  |  |  | $ 21,200 | 31,000 |
Variable interest entity, amount paid |  |  |  |  | 21,200 | 30,000 |
Variable interest entity, distribution received |  | 15,300 |  |  | 15,300 |  |
Income (loss) from equity method investment |  | (1,923) |  | (709) | 16,596 | (10,799) |
Management fees recognized |  | $ 800 |  | $ 800 | $ 2,300 | $ 2,300 |
COVID-19 |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Number of investments impaired | investment |  |  |  |  |  |  | 2
Equity method investment, impairment |  |  |  |  |  |  | $ 7,000

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