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Significant Accounting Policies - Tuition Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Schedule of tuition receivable and allowance for doubtful accounts            
Tuition receivable $ 28,719   $ 28,543      
Allowance for doubtful accounts (9,794) $ (9,981) (10,024) $ (9,776) $ (8,733) $ (8,835)
Tuition receivable, net 18,925   18,519      
Other Assets [Member]            
Schedule of tuition receivable and allowance for doubtful accounts            
Tuition receivable included in other assets $ 2,000   $ 2,000