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Significant Accounting Policies - Tuition Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of tuition receivable and allowance for doubtful accounts        
Tuition receivable $ 84,151 $ 35,809    
Allowance for doubtful accounts (28,457) (12,687) $ (10,201) $ (10,024)
Tuition receivable, net 55,694 23,122    
Other assets        
Schedule of tuition receivable and allowance for doubtful accounts        
Tuition receivable, noncurrent $ 1,100 $ 2,900