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Net Income Per Share (Notes)
 6 Months Ended
Jun. 30, 2018
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, 2018 and 2017 (in thousands, except per share data):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2018
 
2017
 
2018
 
2017
Numerator for Basic and Diluted Earnings Per Share -
 
 
 
 
 
 
 
Net Income
$
696,731

 
$
23,053

 
$
1,335,320

 
$
51,570

Denominator for Basic Earnings Per Share -
 

 
 

 
 

 
 

Weighted Average Shares
576,135

 
574,439

 
575,953

 
574,162

Potential Dilutive Common Shares -
 

 
 

 
 

 
 

Stock Options/SARs
1,365

 
1,452

 
1,237

 
1,669

Restricted Stock/Units and Performance Units/Stock
2,875

 
2,592

 
2,817

 
2,742

Denominator for Diluted Earnings Per Share -
 

 
 

 
 

 
 

Adjusted Diluted Weighted Average Shares
580,375

 
578,483

 
580,007

 
578,573

Net Income Per Share
 

 
 

 
 

 
 

Basic
$
1.21

 
$
0.04

 
$
2.32

 
$
0.09

Diluted
$
1.20

 
$
0.04

 
$
2.30

 
$
0.09



The diluted earnings per share calculation excludes stock options, SARs, restricted stock and units and performance units that were anti-dilutive. Shares underlying the excluded stock options and SARs were zero and 3.4 million shares for the three months ended June 30, 2018 and 2017, respectively, and were zero and 2.0 million shares, respectively, for the six months ended June 30, 2018 and 2017, respectively.