Student Notes Receivable (Details) - Student Loan [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Student notes receivable	$ 60,081	$ 61,078
Allowance for doubtful student notes receivable	(19,448)	(21,317)
Total student notes receivable, net of allowance	40,633	39,761
Less current portion, net of allowance	12,216	11,152
Student notes receivable - non-current portion	$ 28,417	$ 28,609