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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Subject to amortization |  |
Accumulated amortization | $ (177,091) | $ (135,703)
Total |  |
Intangible assets, gross | 455,456 | 462,123
Intangible assets, net | 278,365 | 326,420
Trade names |  |
Not Subject to amortization |  |
Indefinite-lived intangible assets | 254,404 | 259,262
Student relationships |  |
Subject to amortization |  |
Gross carrying amount | 201,052 | 202,861
Accumulated amortization | (177,091) | (135,703)
Net | $ 23,961 | $ 67,158

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