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Net Income Per Share (Notes)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Net Income Per Share   Net Income Per Share

The following table sets forth the computation of Net Income Per Share for the three-month and six-month periods ended June 30, 2019 and 2018 (in thousands, except per share data):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2019
 
2018
 
2019
 
2018
Numerator for Basic and Diluted Earnings Per Share -
 
 
 
 
 
 
 
Net Income
$
847,841

 
$
696,731

 
$
1,483,267

 
$
1,335,320

Denominator for Basic Earnings Per Share -
 

 
 

 
 

 
 

Weighted Average Shares
577,460

 
576,135

 
577,333

 
575,953

Potential Dilutive Common Shares -
 

 
 

 
 

 
 

Stock Options/SARs
434

 
1,365

 
452

 
1,237

Restricted Stock/Units and Performance Units
2,353

 
2,875

 
2,419

 
2,817

Denominator for Diluted Earnings Per Share -
 

 
 

 
 

 
 

Adjusted Diluted Weighted Average Shares
580,247

 
580,375

 
580,204

 
580,007

Net Income Per Share
 

 
 

 
 

 
 

Basic
$
1.47

 
$
1.21

 
$
2.57

 
$
2.32

Diluted
$
1.46

 
$
1.20

 
$
2.56

 
$
2.30



The diluted earnings per share calculation excludes stock options and SARs that were anti-dilutive. Shares underlying the excluded stock options and SARs were 6 million and zero shares for the three months ended June 30, 2019 and 2018, respectively, and were 6 million and zero shares for the six months June 30, 2019 and 2018, respectively.