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Other Long-Term Liabilities (Tables)
 9 Months Ended
Sep. 30, 2012
Other Long-Term Liabilities [Abstract]  
Schedule of other long-term liabilities
 
 
   
2011
    
2012
  
Deferred rent
  
$
10,302
    
$
11,384
  
Lease incentives
    
4,088
      
4,036
  
Deferred gain on sale of campus building
    
1,256
      
1,046
  
Fair value of interest rate swap (see Note 5)
    
1,010
      
896
  
Deferred payments (see Note 3)
    
5,000
      
4,953
  
   
$
21,656
    
$
22,315