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Investments and Fair Value Measurements - Investment Category and Length (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2021 USD ($) company | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) company
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |  |
Fair value, in loss position less than twelve months | $ 6,175 |  |  | $ 6,175 |  | $ 2,048
Gross unrealized loss, in loss position less than twelve months | (11) |  |  | (11) |  | (2)
Fair value, total in loss position | 6,175 |  |  | 6,175 |  | 2,048
Gross unrealized loss, total in loss position | (11) |  |  | (11) |  | (2)
Minority Investments |  |  |  |  |  |
Investments, equity method | 9,340 |  |  | $ 9,340 |  | $ 6,376
Number of equity method investments | company |  |  |  | 5 |  | 5
Impairment charge | 0 | $ 0 | $ 1,100 | $ 0 | $ 0 |
Certificates of deposit. |  |  |  |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |  |
Fair value, in loss position less than twelve months | 959 |  |  | 959 |  |
Gross unrealized loss, in loss position less than twelve months | (1) |  |  | (1) |  |
Fair value, total in loss position | 959 |  |  | 959 |  |
Gross unrealized loss, total in loss position | (1) |  |  | (1) |  |
Corporate bonds |  |  |  |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |  |
Fair value, in loss position less than twelve months | 5,216 |  |  | 5,216 |  | $ 2,048
Gross unrealized loss, in loss position less than twelve months | (10) |  |  | (10) |  | (2)
Fair value, total in loss position | 5,216 |  |  | 5,216 |  | 2,048
Gross unrealized loss, total in loss position | (10) |  |  | (10) |  | (2)
Other assets |  |  |  |  |  |
Minority Investments |  |  |  |  |  |
Investments, equity method | $ 9,300 |  |  | $ 9,300 |  | $ 6,400

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