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Other Long-Term Liabilities (Tables)
 12 Months Ended
Dec. 31, 2011
Other Long-Term Liabilities [Abstract]  
Schedule Of Long-Term Liabilities
     2010      2011  

Deferred rent

    $ 7,902       $ 10,302   

Lease incentives

      3,205         4,088   

Deferred gain on sale of campus building

      1,537         1,256   

Fair value of interest rate swap (see Note 7)

      –         1,010   

Deferred payments (see Note 6)

      –         5,000   
  

 

 

     

 

 

  
   $ 12,644       $ 21,656