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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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