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Term Loan and Revolving Credit Facility (Details)
3 Months Ended 9 Months Ended
Jul. 02, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Term Loan and Revolving Credit Facility (Textual)          
Revolving credit facility, value $ 150,000,000        
Maximum aggregate incremental term loans $ 50,000,000        
Maturity date Jul. 02, 2020        
Cash interest paid   $ 100,000 $ 1,100,000 $ 2,300,000 $ 3,400,000
Covenant terms required by credit facility      

a leverage ratio of not greater than 2 to 1. Leverage ratio is defined as the ratio of total debt to trailing four-quarter EBITDA (earnings before interest, taxes, depreciation, amortization and non-cash charges such as stock-based compensation).

 

a coverage ratio of not less than 1.75 to 1. Coverage ratio is defined as the ratio of trailing four-quarter EBITDA and rent expense to trailing four-quarter interest and rent expense.

 

a Department of Education Financial Responsibility Composite Score of not less than 1.5.
 
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  
Minimum [Member]          
Term Loan and Revolving Credit Facility (Textual)          
Margin rate for interest if using base rate       2.00%  
Unused commitment fee       0.30%  
Maximum [Member]          
Term Loan and Revolving Credit Facility (Textual)          
Margin rate for interest if using base rate       2.50%  
Unused commitment fee       0.40%  
Revolving Credit Facility [Member] | Base Rate [Member]          
Term Loan and Revolving Credit Facility (Textual)          
Debt instrument description of variable rate basis       Base rate  
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Term Loan and Revolving Credit Facility (Textual)          
Debt instrument description of variable rate basis       LIBOR  
Revolving Credit Facility [Member] | Minimum [Member]          
Term Loan and Revolving Credit Facility (Textual)          
Margin rate for interest if using base rate       1.75%  
Unused commitment fee       0.25%  
Revolving Credit Facility [Member] | Maximum [Member]          
Term Loan and Revolving Credit Facility (Textual)          
Margin rate for interest if using base rate       2.25%  
Unused commitment fee       0.35%