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Net Income Per Share (Tables)
 3 Months Ended
Mar. 31, 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 periods ended March 31, 2018 and 2017 (in thousands, except per share data):
 
Three Months Ended 
 March 31,
 
2018
 
2017
Numerator for Basic and Diluted Earnings Per Share -
 
 
 
Net Income
$
638,589

 
$
28,517

Denominator for Basic Earnings Per Share -
 

 
 

Weighted Average Shares
575,775

 
573,935

Potential Dilutive Common Shares -
 

 
 

Stock Options/SARs
1,217

 
1,871

Restricted Stock/Units and Performance Units/Stock
2,734

 
2,787

Denominator for Diluted Earnings Per Share -
 

 
 

Adjusted Diluted Weighted Average Shares
579,726

 
578,593

Net Income Per Share
 

 
 

Basic
$
1.11

 
$
0.05

Diluted
$
1.10

 
$
0.05