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Significant Accounting Policies - Tuition Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Tuition receivable | $ 126,616 | $ 100,060
Allowance for credit losses | (44,940) | (48,783)
Tuition receivable, net | 81,676 | 51,277
Tuition receivable, noncurrent | 2,716 | 2,466
Other Assets |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Tuition receivable, noncurrent | $ 2,700 | $ 2,500

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