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Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |  |  |  |
Cloud computing arrangements, net of current portion | $ 25,011 |  | $ 18,328 |  |  |
Prepaid expenses, net of current portion | 15,231 |  | 15,678 |  |  |
Equity method investments | 9,284 | $ 11,397 | 13,428 | $ 13,595 | $ 13,963 | $ 16,068
Tuition receivable, net, non-current | 6,364 |  | 7,040 |  |  |
Other investments | 2,786 |  | 2,786 |  |  |
Deferred contract costs, net of current portion | 2,710 |  | 808 |  |  |
Other | 4,401 |  | 4,842 |  |  |
Other assets | $ 65,787 |  | $ 62,910 |  |  |

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