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Significant Accounting Policies - Tuition Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Tuition receivable | $ 136,401 | $ 99,942
Allowance for credit losses | (49,278) | (49,773)
Tuition receivable, net | 87,123 | 50,169
Tuition receivable, noncurrent | 2,912 | 3,585
Other Assets |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Tuition receivable, noncurrent | $ 2,900 | $ 3,600

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