Student Notes Receivable (Details) - Student Loan [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Student notes receivable	$ 61,078	$ 53,025
Allowance for doubtful student notes receivable	(21,317)	(19,361)
Total student notes receivable, net of allowance	39,761	33,664
Less current portion, net of allowance	11,152	8,393
Student notes receivable - non-current portion	$ 28,609	$ 25,271