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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2018
Schedule of Total Stock-Based Compensation Expense Included in Company's Consolidated Statements of Income and Comprehensive Income

The total stock-based compensation expense included in the Company’s consolidated statements of income and comprehensive income was as follows:

 

     Three Months Ended
March 31, 2018
     Three Months Ended
March 31, 2017
 

Cost of revenue

   $ 1,005      $ 930  

Research and development expense

     722        745  

Selling, general and administrative expense

     8,699        7,107  
  

 

 

    

 

 

 

Total pre-tax stock-based compensation expense

   $ 10,426      $ 8,782  
  

 

 

    

 

 

 
Summary of Activity for RSUs

The following table presents the activity for RSUs under the Plan:

 

     Three Months Ended March 31, 2018  
     Outstanding RSUs      Weighted Average
Grant Date
Fair Value
 

RSUs — beginning of period

     943,379      $ 47.57  

Accrued dividend shares

     18        124.85  

Granted

     122,831        109.62  

Vested

     (204,290      40.96  

Forfeited

     (23,740      61.63  
  

 

 

    

RSUs — end of period

     838,198      $ 57.88  
  

 

 

    
Stock Appreciation Rights (SARs) [Member]  
Summary of Activity for Outstanding and Exercisable Stock Appreciation Rights

The following table presents the activity for SARs under the Plan:

 

     Three Months Ended March 31, 2018  
     Outstanding SARs      Weighted Average
Grant Date
Fair Value
 

SARs — beginning of period

     282,907      $ 28.62  

Exercised

     (17,775      27.90  

Forfeited or expired

     (773      31.13  
  

 

 

    

SARs Outstanding — end of period

     264,359      $ 28.66