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Significant Accounting Policies - Tuition Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Tuition receivable $ 128,200 $ 99,942
Allowance for credit losses (49,591) (49,773)
Tuition receivable, net 78,609 50,169
Other Assets    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Tuition receivable, noncurrent $ 3,200 $ 3,600