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Other Long-Term Liabilities (Tables)
 3 Months Ended
Mar. 31, 2016
Other Long-Term Liabilities [Abstract]  
Schedule of other long-term liabilities

  December 31, 2015  March 31, 2016 
Deferred payments related to acquisitions $6,078  $20,773 
Deferred revenue, net of current portion  14,429   12,221 
Loss on facilities not in use  15,229   11,888 
Deferred rent and other facility costs  8,993   9,112 
Lease incentives  3,125   3,035 
Deferred gain on sale of campus building  133   62 
  $47,987  $57,091