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Term Loan and Revolving Credit Facility (Details Textual) (USD $)
1 Months Ended 3 Months Ended
Nov. 30, 2012
Mar. 31, 2014
Mar. 31, 2013
Nov. 08, 2012
Term Loan and Revolving Credit Facility (Textual)        
Maturity date Dec. 31, 2016      
Debt   $ 121,094,000    
Term loan facility, quarterly amortization payments, during 2013       781,250
Term loan facility, quarterly amortization payments, during 2014       781,250
Term loan facility, quarterly amortization payments, during 2015       1,562,500
Term loan facility, quarterly amortization payments, during 2016       1,562,500
Quarterly payment percentage of aggregate original principal amount of term loan facility in year one and two       0.625%
Quarterly payment percentage of aggregate original principal amount of term loan facility in year three and four       1.25%
Cash interest paid   1,200,000 1,100,000  
Covenant terms required by credit facility   1) A total leverage ratio of not greater than 2.00:1.00; 2) A coverage ratio of not less than 1.75:1.00; 3) A Department of Education financial composite score of not less than 1.5.    
Maximum total leverage ratio   2.00    
Minimum coverage ratio   1.75    
Minimum department of education financial composite score   1.5    
Revolving Credit Facility [Member]
       
Term Loan and Revolving Credit Facility (Textual)        
Revolving credit facility, value       100,000,000
Option to increase commitments under credit facility       50,000,000
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] | Base Rate [Member]
       
Term Loan and Revolving Credit Facility (Textual)        
Margin rate for interest if using base rate   2.00%    
Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]
       
Term Loan and Revolving Credit Facility (Textual)        
Margin rate for interest if using base rate   2.50%    
Revolving Credit Facility [Member] | Letter of Credit [Member]
       
Term Loan and Revolving Credit Facility (Textual)        
Option to increase commitments under credit facility       50,000,000
Term Loan Facility [Member]
       
Term Loan and Revolving Credit Facility (Textual)        
Revolving credit facility, value       125,000,000
Debt   $ 121,100,000    
Term Loan Facility [Member] | Interest Rate Swap [Member]
       
Term Loan and Revolving Credit Facility (Textual)        
Interest rate swap, fixed rate minimum   2.85%    
Interest rate swap, fixed rate maximum   3.35%    
Term Loan Facility [Member] | Minimum [Member]
       
Term Loan and Revolving Credit Facility (Textual)        
Unused commitment fee   0.30%    
Term Loan Facility [Member] | Maximum [Member]
       
Term Loan and Revolving Credit Facility (Textual)        
Unused commitment fee   0.40%