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Share-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Activity Related to Restricted Stock Granted under 2008 Equity Incentive Plan

A summary of the activity related to restricted stock granted under the University’s 2008 Equity Incentive Plan (“Incentive Plan”) since December 31, 2015 is as follows:

 

     Total
Shares
     Weighted Average
Grant Date

Fair Value per Share
 

Outstanding as of December 31, 2015

     1,056       $ 34.30   

Granted

     274       $ 44.46   

Vested

     (324    $ 30.44   

Forfeited, canceled or expired

     (2    $ 38.34   
  

 

 

    

Outstanding as of June 30, 2016

     1,004       $ 38.32   
  

 

 

    
Summary of Activity Related to Stock Options Granted under Company's Incentive Plan

A summary of the activity related to stock options granted under the University’s Incentive Plan since December 31, 2015 is as follows:

 

     Summary of Stock Options Outstanding  
     Total
Shares
     Weighted
Average
Exercise
Price per
Share
     Weighted
Average
Remaining
Contractual
Term (Years)
     Aggregate
Intrinsic
Value ($)(1)
 

Outstanding as of December 31, 2015

     2,220       $ 14.71         

Granted

     —         $ —           

Exercised

     (493    $ 14.17         

Forfeited, canceled or expired

     —         $ —           
  

 

 

          

Outstanding as of June 30, 2016

     1,727       $ 14.87         3.36       $ 43,270   
  

 

 

    

 

 

    

 

 

    

 

 

 

Exercisable as of June 30, 2016

     1,721       $ 14.83         3.35       $ 43,182   
  

 

 

    

 

 

    

 

 

    

 

 

 

Available for issuance as of June 30, 2016

     1,794            
  

 

 

          

 

(1) Aggregate intrinsic value represents the value of the University’s closing stock price on June 30, 2016 ($39.92) in excess of the exercise price multiplied by the number of shares underlying options outstanding or exercisable, as applicable.
Share-Based Compensation Expense

The table below outlines share-based compensation expense for the six months ended June 30, 2016 and 2015 related to restricted stock and stock options granted:

 

     2016      2015  

Instructional costs and services

   $ 3,544       $ 3,304   

Admissions advisory and related expenses

     105         93   

Marketing and promotional

     60         93   

General and administrative

     2,122         2,022   
  

 

 

    

 

 

 

Share-based compensation expense included in operating expenses

     5,831         5,512   

Tax effect of share-based compensation

     (2,332      (2,205
  

 

 

    

 

 

 

Share-based compensation expense, net of tax

   $ 3,499       $ 3,307