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Long Term Debt (Details)
5 Months Ended 12 Months Ended
Aug. 01, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jul. 31, 2018
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]            
Maximum total leverage ratio   2 2      
Minimum coverage ratio   1.75 1.75      
Minimum department of education financial composite score   1.5 1.5      
Cash interest paid     $ 400,000 $ 400,000    
Revolving credit facility, outstanding   $ 0 $ 0 $ 0   $ 0
Revolving Credit Facility | Minimum            
Debt Instrument [Line Items]            
Margin rate     1.50%      
Unused commitment fee     0.20%      
Revolving Credit Facility | Maximum            
Debt Instrument [Line Items]            
Margin rate     2.00%      
Unused commitment fee     0.30%      
Amended Credit Facility | Revolving Credit Facility            
Debt Instrument [Line Items]            
Revolving credit facility, value $ 250,000,000          
Maximum aggregate incremental term loans 150,000,000          
Amortization period   5 years        
Payments of debt financing costs $ 1,200,000          
Prior Credit Facility | Revolving Credit Facility            
Debt Instrument [Line Items]            
Revolving credit facility, value         $ 150,000,000