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Other Long-Term Liabilities (Tables)
 9 Months Ended
Sep. 30, 2015
Other Long-Term Liabilities [Abstract]  
Schedule of other long-term liabilities
  December 31, 2014  September 30,  2015 
Loss on facilities not in use $21,280  $17,414 
Deferred revenue, net of current portion  9,654   10,721 
Deferred rent and other facility costs  8,646   8,713 
Deferred payments related to acquisition  5,198   5,832 
Lease incentives  1,056   2,678 
Deferred gain on sale of campus building  414   203 
  $46,248  $45,561