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Significant Accounting Policies - Tuition Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Tuition receivable $ 119,444 $ 100,060
Allowance for credit losses (43,507) (48,783)
Tuition receivable, net 75,937 51,277
Tuition receivable, noncurrent 1,894 2,466
Other Assets    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Tuition receivable, noncurrent $ 1,900 $ 2,500