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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Calculation of Net Income Per Share
The calculation of net income per share for the three years ended December 31, 2016 is reflected in the following table (in thousands, except per share amounts):
 
 
 
Years Ended December 31,
 
 
2016
 
2015
 
2014
 
 
 
 
 
 
 
Net income
 
$
343,389

 
$
357,796

 
$
305,928

Basic:
 
 
 
 
 
 
       Weighted average shares
 
127,991

 
131,749

 
134,358

        Diluted:
 
 
 
 
 
 
        Weighted average shares
 
127,991

 
131,749

 
134,358

        Dilutive effect of potential common shares
 
775

 
1,181

 
1,183

        Diluted weighted average shares
 
128,766

 
132,930

 
135,541

Net income per share:
 
 
 
 
 
 
        Basic
 
$
2.68

 
$
2.72

 
$
2.28

        Diluted
 
$
2.67

 
$
2.69

 
$
2.26