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Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |  |  |  |
Prepaid expenses, net of current portion | $ 18,753 |  | $ 19,852 |  |  |
Equity method investments | 13,979 | $ 14,011 | 15,582 | $ 14,532 | $ 17,401 | $ 15,795
Cloud computing arrangements | 6,835 |  | 5,957 |  |  |
Other investments | 3,896 |  | 3,576 |  |  |
Tuition receivable, net, non-current | 2,716 |  | 2,466 |  |  |
Other | 4,168 |  | 4,864 |  |  |
Other assets | $ 50,347 |  | $ 52,297 |  |  |

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