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Summary of Significant Accounting Policies - Acquisition (Details) - USD ($)
$ in Thousands
Jan. 22, 2019
Jun. 30, 2022
Dec. 31, 2021
Acquisition      
Goodwill   $ 160,766 $ 160,766
Orbis Education      
Acquisition      
Purchase price $ 361,184    
Intangible assets 210,280    
Goodwill 157,825    
Orbis Education | University partner relationships      
Acquisition      
Intangible assets $ 210,000