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Other Long-Term Liabilities (Tables)
 3 Months Ended
Mar. 31, 2014
Other Long-Term Liabilities [Abstract]  
Schedule of other long-term liabilities

  
2013
  
2014
 
Loss on facilities not in use
 
$
34,339
  
$
30,670
 
Deferred rent and other facility costs
  
8,258
   
8,925
 
Deferred payments related to acquisition
  
4,915
   
4,916
 
Deferred revenue, net of current portion
  
1,897
   
4,305
 
Lease incentives
  
1,353
   
1,245
 
Deferred gain on sale of campus building
  
694
   
624
 
  
$ 
51,456
  
$
 50,685