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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2014
Income Taxes [Abstract]  
Schedule of income tax provision
  2012  2013  2014 
Current:         
Federal $36,028  $26,390  $25,285 
State  8,333   4,582   4,490 
Total current  44,361   30,972   29,775 
Deferred:            
Federal  (608   (18,387)  141 
State  (708)  (1,726)  344 
Total deferred  (1,316)  (20,113)  485 
Total provision for income taxes $43,045  $10,859  $30,260
Schedule of tax effects of principal temporary differences that give rise to deferred tax assets
 
  2013  2014 
Tuition receivable $4,021  $3,439 
Other facility-related costs  3,684   2,824 
Employee-related liabilities  144   (96)
Current net deferred tax asset  7,849   6,167 
Stock-based compensation  13,871   12,994 
Property and equipment  (13,091)  (11,622)
Other facility-related costs  13,696   8,903 
Deferred revenue  -   3,758 
Deferred leasing costs  3,082   2,797 
Interest rate swap  (18)  (56)
Other  (411)  (533)
Long-term net deferred tax asset  17,129   16,241 
Net deferred tax asset $24,978  $22,408 
 
Summary of changes in unrecognized tax benefits

 
    Year Ended December 31,   
     2013   2014
Beginning unrecognized tax benefits
           $        $1,745  
Additions based on tax positions taken in the current year
             1,745         2,085  
Gross reductions for tax positions taken in prior years
                       (565)  
Settlements with taxing authorities
                       (329)  
Ending unrecognized tax benefits
           $1,745       $2,936
Schedule of reconciliation between statutory tax rate and effective tax rate
  2012  2013  2014 
Statutory federal rate  35.0%  35.0%  35.0%
State income taxes, net of federal benefits  4.3   4.6   4.2 
Other  0.2   0.2   0.3 
Effective tax rate  39.5%  39.8%  39.5%