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Other Long-Term Liabilities (Tables)
9 Months Ended
Sep. 30, 2014
Other Long-Term Liabilities [Abstract]  
Schedule of other long-term liabilities
  December 31,  September 30, 
  2013  2014 
Loss on facilities not in use $34,339  $23,102 
Deferred rent and other facility costs  8,258   8,893 
Deferred payments related to acquisition  4,915   4,967 
Deferred revenue, net of current portion  1,897   6,403 
Lease incentives  1,353   1,093 
Deferred gain on sale of campus building  694   484 
  $51,456  $44,942