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Significant Accounting Policies (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Schedule of tuition receivable and allowance for doubtful accounts        
Tuition receivable $ 28,839 $ 28,543    
Allowance for doubtful accounts (10,226) (10,024) $ (8,688) $ (8,835)
Tuition receivable, net $ 18,613 $ 18,519