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Significant Accounting Policies - Tuition Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Accounting Policies [Line Items] |  |
Tuition receivable | $ 110,066 | $ 100,060
Allowance for credit losses | (47,113) | (48,783)
Tuition receivable, net | 62,953 | 51,277
Tuition receivable, noncurrent | 2,673 | 2,466
Other assets |  |
Accounting Policies [Line Items] |  |
Tuition receivable, noncurrent | $ 2,700 | $ 2,500

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