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Significant Accounting Policies - Graduation Fund (Details)
 9 Months Ended
Sep. 30, 2016
USD ($)
item
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Schedule of activity in the Graduation Fund      
Consecutive terms of non attendance in which Graduation Fund credits will be lost | item 1    
Number of free courses | item 1    
Number of successfully completed courses | item 3    
Expected collection period of tuition receivable 12 months    
Balance at beginning of year $ 20,937,000 $ 9,706,000  
Revenue deferred 17,799,000 12,423,000  
Benefit redeemed (12,185,000) (3,974,000)  
Balance at end of year 26,551,000 $ 18,155,000  
Current Liability [Member]      
Schedule of activity in the Graduation Fund      
Graduation fund estimated to be redeemed 12,700,000    
Other Assets [Member]      
Restricted cash      
Restricted cash 0   $ 0
Minimum protective endowment $ 500,000