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Student Notes Receivable (Details) - Student Loan [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Student notes receivable $ 48,121 $ 34,097
Allowance for doubtful student notes receivable (21,026) (15,682)
Total student notes receivable, net of allowance 27,095 18,415
Less current portion, net of allowance 6,326 7,350
Student notes receivable - non-current portion $ 20,769 $ 11,065