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Term Loan and Revolving Credit Facility (Details Textual) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Nov. 08, 2012
Term Loan and Revolving Credit Facility (Textual)          
Debt $ 122,656,000   $ 122,656,000    
Option to increase commitments under credit facility         50,000,000
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 1,200,000 900,000 3,400,000 2,800,000  
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   2.00    
Minimum coverage ratio 1.75   1.75    
Minimum department of education financial composite score 1.5   1.5    
Minimum [Member]
         
Term Loan and Revolving Credit Facility (Textual)          
Unused commitment fee     0.30%    
Term loan facility, effective percentage 2.85%   2.85%    
Maximum [Member]
         
Term Loan and Revolving Credit Facility (Textual)          
Unused commitment fee     0.40%    
Term loan facility, effective percentage 3.35%   3.35%    
Letter of Credit [Member]
         
Term Loan and Revolving Credit Facility (Textual)          
Maximum borrowing on term loan facility         50,000,000
LIBOR [Member] | Minimum [Member]
         
Term Loan and Revolving Credit Facility (Textual)          
Margin rate for interest if using base rate 2.00%   2.00%    
Interest rate swap, fixed rate 2.85%   2.85%    
LIBOR [Member] | Maximum [Member]
         
Term Loan and Revolving Credit Facility (Textual)          
Margin rate for interest if using base rate 2.50%   2.50%    
Interest rate swap, fixed rate 3.35%   3.35%    
Revolving Credit Facility [Member]
         
Term Loan and Revolving Credit Facility (Textual)          
Maximum borrowing on term loan facility         100,000,000
Term Loan Facility [Member]
         
Term Loan and Revolving Credit Facility (Textual)          
Maximum borrowing on term loan facility         125,000,000
Debt $ 122,700,000   $ 122,700,000