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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