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Long Term Debt (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jul. 02, 2015
USD ($)
Debt Instrument [Line Items]          
Revolving credit facility, value         $ 150,000,000
Maximum aggregate incremental term loans         $ 50,000,000
Payments of debt financing costs     $ 900,000    
Cash interest paid $ 200,000 $ 100,000 $ 300,000 $ 2,300,000  
Maximum total leverage ratio 2   2    
Minimum coverage ratio 1.75   1.75    
Minimum department of education financial composite score 1.5   1.5    
Revolving credit facility, outstanding $ 0   $ 0    
Revolving Credit Facility [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Debt instrument description of variable rate basis     base rate    
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument [Line Items]          
Debt instrument description of variable rate basis     LIBOR    
Revolving Credit Facility [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Margin rate for interest if using base rate     1.75%    
Unused commitment fee     0.25%    
Revolving Credit Facility [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Margin rate for interest if using base rate     2.25%    
Unused commitment fee     0.35%