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Student Notes Receivable (Details) - Student Loan [Member] - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Student notes receivable $ 62,791 $ 60,081
Allowance for doubtful student notes receivable (22,911) (19,448)
Total student notes receivable, net of allowance 39,880 40,633
Less current portion, net of allowance 13,416 12,216
Student notes receivable - non-current portion $ 26,464 $ 28,417