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Other Long-Term Liabilities (Tables)
 12 Months Ended
Dec. 31, 2014
Other Long-Term Liabilities [Abstract]  
Schedule of other long-term liabilities
 
     2013   2014
Loss on facilities not in use
           $34,339       $21,280  
Deferred revenue, net of current portion
             1,897         9,654  
Deferred rent and other facility costs
             8,258         8,646  
Deferred payments related to acquisition
             4,915         5,198  
Lease incentives
             1,353         1,056  
Deferred gain on sale of campus building
             694          414   
 
           $51,456       $46,248