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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Calculation of Net Income Per Share
The calculation of net income per share for the three years ended December 31, 2017 is reflected in the following table (in thousands, except per share amounts):
 
 
 
Years Ended December 31,
 
 
2017
 
2016
 
2015
 
 
 
 
 
 
 
Net income
 
$
290,584

 
$
343,389

 
$
357,796

Basic:
 
 
 
 
 
 
       Weighted average shares
 
124,152

 
127,991

 
131,749

        Diluted:
 
 
 
 
 
 
        Weighted average shares
 
124,152

 
127,991

 
131,749

        Dilutive effect of potential common shares
 
740

 
775

 
1,181

        Diluted weighted average shares
 
124,892

 
128,766

 
132,930

Net income per share:
 
 
 
 
 
 
        Basic
 
$
2.34

 
$
2.68

 
$
2.72

        Diluted
 
$
2.33

 
$
2.67

 
$
2.69