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Net Income Per Share (Tables)
12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Reconciliation of Basic and Diluted Net Income Per Share

The following is a reconciliation of basic to diluted net income per share:

 

    Years Ended December 31,  
    2018     2017     2016  

Numerator:

     

Net income

  $ 392,896     $ 339,132     $ 104,809  
 

 

 

   

 

 

   

 

 

 

Denominator:

     

Shares used in net income per common share — basic

  $ 54,406,000       54,137,000       53,472,000  

Effect of dilutive securities

    586,000       937,000       579,000  
 

 

 

   

 

 

   

 

 

 

Shares used in net income per common share — diluted

    54,992,000       55,074,000       54,051,000  
 

 

 

   

 

 

   

 

 

 

Net income per common share:

     

Basic

  $ 7.22     $ 6.26     $ 1.96  

Diluted

  $ 7.14     $ 6.16     $ 1.94