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Other Long-Term Liabilities (Tables)
 3 Months Ended
Mar. 31, 2013
Other Long-Term Liabilities [Abstract]  
Schedule of other long-term liabilities
 
   
2012
    
2013
  
Deferred rent and other facility costs
  
$
11,650
    
$
11,901
  
Deferred payments related to acquisition
    
4,919
      
4,915
  
Lease incentives
    
3,150
      
3,086
  
Deferred taxes
    
—
      
1,406
  
Fair value of interest rate swap (see Note 3)
    
1,211
      
980
  
Deferred gain on sale of campus building
    
975
      
905
  
   
$
21,905
    
$
23,193