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Other Long-Term Liabilities (Tables)
 12 Months Ended
Dec. 31, 2012
Other Long-Term Liabilities [Abstract]  
Schedule of other long-term liabilities
           
   
2011
    
2012
  
Deferred rent and other facility costs
   $ 10,302     $ 11,650  
Deferred payments (see Note 5)
     5,000       4,919  
Lease incentives
     4,088       3,150  
Fair value of interest rate swap (see Note 6)
     1,010       1,211  
Deferred gain on sale of campus building
     1,256       975  
    $ 21,656     $ 21,905