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Other Long-Term Liabilities (Tables)
 12 Months Ended
Dec. 31, 2013
Other Long-Term Liabilities [Abstract]  
Schedule of noncurrent liabilities
 
   
2012
    
2013
  
Loss on facilities not in use
   $ –     $ 34,339  
Deferred rent and other facility costs
     11,650       8,258  
Deferred payments (see Note 6)
     4,919       4,915  
Unearned tuition
     –       1,897  
Lease incentives
     3,150       1,353  
Deferred gain on sale of campus building
     975       694  
Fair value of interest rate swap (see Note 7)
     1,211       –  
    $ 21,905     $ 51,456