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Other Long-Term Liabilities (Tables)
 6 Months Ended
Jun. 30, 2012
Other Long-Term Liabilities [Abstract]  
Schedule of other long-term liabilities
 
   
2011
    
2012
  
Deferred rent
   $ 10,302     $ 11,081  
Lease incentives
     4,088       3,630  
Deferred gain on sale of campus building
     1,256       1,116  
Fair value of interest rate swap (see Note 5)
     1,010       918  
Deferred payments (see Note 3)
     5,000       4,952  
    $ 21,656     $ 21,697