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Student Notes Receivable (Details) - Student Loan [Member] - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Student notes receivable $ 53,025 $ 48,121
Allowance for doubtful student notes receivable (19,361) (21,026)
Total student notes receivable, net of allowance 33,664 27,095
Less current portion, net of allowance 8,393 6,326
Student notes receivable - non-current portion $ 25,271 $ 20,769