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Net Income Per Share
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Net Income Per Share
Net Income Per Share
The calculation of net income per share for the three and six months ended June 30, 2018 and 2017 is reflected in the following table (in thousands, except per share amounts):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
Net income
$
109,315

 
$
80,316

 
$
205,482

 
$
158,837

Basic:
 
 
 
 
 
 
 
Weighted average shares
121,307

 
124,617

 
121,619

 
125,074

 
 
 
 
 
 
 
 
Diluted:
 
 
 
 
 
 
 
Weighted average shares
121,307

 
124,617

 
121,619

 
125,074

Dilutive effect of potential common shares
961

 
487

 
957

 
684

Diluted weighted average shares
122,268

 
125,104

 
122,576

 
125,758

 
 
 
 
 
 
 
 
Net income per share:
 
 
 
 
 
 
 
Basic
$
.90

 
$
.64

 
$
1.69

 
$
1.27

Diluted
$
.89

 
$
.64

 
$
1.68

 
$
1.26