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Significant Accounting Policies - Tuition Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Schedule of tuition receivable and allowance for doubtful accounts            
Tuition receivable $ 32,102   $ 30,733      
Allowance for doubtful accounts (11,760) $ (10,820) (10,201) $ (9,981) $ (10,226) $ (10,024)
Tuition receivable, net 20,342   20,532      
Other Assets [Member]            
Schedule of tuition receivable and allowance for doubtful accounts            
Tuition receivable included in other assets $ 2,600   $ 2,300