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Other Long-Term Liabilities (Tables)
 9 Months Ended
Sep. 30, 2013
Other Long-Term Liabilities [Abstract]  
Schedule of other long-term liabilities
 
2012
   
2013
 
Deferred rent and other facility costs
 
$
11,650
   
$
12,261
 
Deferred payments related to acquisition
   
4,919
     
4,916
 
Lease incentives
   
3,150
     
2,755
 
Fair value of interest rate swap (see Note 3)
   
1,211
     
31
 
Deferred gain on sale of campus building
   
975
     
765
 
Unearned tuition, net of current portion
   
—
     
678
 
   
$
21,905
   
$
21,406