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Share-based Compensation (Tables)
9 Months Ended
Sep. 30, 2015
Summary of Stock Option Activity

The following table summarizes the Company’s stock option activity (in thousands, except per share data and years) for the three months ended September 30, 2015:

 

     Stock Options Outstanding  
            Weighted Average      Aggregate      Weighted Average  
            Exercise Price      Intrinsic      Remaining Contractual  
     Shares      Per Share      Value      Term (Years)  

Balance as of July 1, 2015

     1,306       $ 120.62         

Granted

     130         201.25         

Exercised

     0         0.00       $ 0      

Forfeited/Expired

     0         0.00         
  

 

 

          

Balance as of September 30, 2015

     1,436       $ 127.91         
  

 

 

          

Exercisable as of September 30, 2015

     351       $ 103.09       $ 32,800         7.6   

Expected to vest as of September 30, 2015

     1,035       $ 138.03       $ 61,105         8.8   
  

 

 

          

Total

     1,386       $ 129.18       $ 93,904         8.5   
  

 

 

          
Range Of Exercise Prices

Stock options outstanding as of September 30, 2015 are comprised of the following range of exercise prices per share (in thousands, except per share data and years):

 

     Stock Options Outstanding at September 30, 2015  
            Weighted Average      Weighted Average  
            Exercise Price      Remaining Contractual  

Range of Exercise Prices per Share

   Shares      Per Share      Term (Years)  

$  92.84 - $120.00

     507       $ 94.49         6.9   

$120.01 - $150.00

     514       $ 121.43         8.6   

$150.01 - $180.00

     285       $ 165.66         9.3   

$180.01 - $201.25

     130       $ 201.25         9.9   
  

 

 

       

Total

     1,436       $ 127.91         8.2   
  

 

 

       
Assumptions Used in Black-Scholes Option-Pricing Model

The weighted average grant date fair value of stock option awards using the Black-Scholes pricing model was $82.89 for each share subject to a stock option granted during the three months ended September 30, 2015, based on the following assumptions:

 

     Three months ended  
     September 30,  
     2015  

Expected term of options in years

     6.3   

Expected volatility

     39.0

Risk-free interest rate

     1.9

Expected dividend yield

     0.0