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Significant Accounting Policies (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Significant Accounting Policies (Textual)      
Percentage of tuition revenue in total revenue 96.00%    
Depreciation and amortization on property and equipment $ 23,973 $ 21,525 $ 17,309
Common stock, par value $ 0.01 $ 0.01  
Common stock, shares authorized 20,000,000 20,000,000  
Common stock, shares issued 11,387,299 11,792,456  
Common stock, shares outstanding 11,387,299 11,792,456  
Preferred stock, shares authorized 8,000,000 8,000,000  
Preferred stock, shares issued        
Preferred stock, shares outstanding        
Minimum [Member]
      
Significant Accounting Policies (Textual)      
Estimated useful life of property and equipment 3 years    
Leasehold improvements and long-term liability amortization period 5 years    
Maximum [Member]
      
Significant Accounting Policies (Textual)      
Estimated useful life of property and equipment 40 years    
Leasehold improvements and long-term liability amortization period 10 years