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Other Long-Term Liabilities (Tables)
 3 Months Ended
Mar. 31, 2012
Other Long-Term Liabilities [Abstract]  
Schedule Of Other Long-Term Liabilities
     2011      2012  

Deferred rent

    $ 10,302       $ 10,741   

Lease incentives

      4,088         3,818   

Deferred gain on sale of campus building

      1,256         1,186   

Fair value of interest rate swap (see Note 5)

      1,010         1,073   

Deferred payments (see Note 3)

      5,000         5,000   
  

 

 

     

 

 

  
   $ 21,656       $ 21,818