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Other Long-Term Liabilities (Tables)
3 Months Ended
Mar. 31, 2015
Other Long-Term Liabilities [Abstract]  
Schedule of other long-term liabilities

  December 31, 2014  March 31, 2015 
Loss on facilities not in use $21,280  $19,911 
Deferred revenue, net of current portion  9,654   11,257 
Deferred rent and other facility costs  8,646   8,586 
Deferred payments related to acquisition  5,198   5,488 
Lease incentives  1,056   1,142 
Deferred gain on sale of campus building  414   343 
Fair value of interest swap (see Note 5)     192 
  $46,248  $46,919