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Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Computation of 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