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Significant Accounting Policies (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Schedule of tuition receivable and allowance for doubtful accounts            
Tuition receivable $ 26,840   $ 25,777      
Allowances for doubtful accounts (9,776) $ (8,733) (8,835) $ (8,568) $ (9,144) $ (10,303)
Tuition receivable, net $ 17,064   $ 16,942