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Net Income (Loss) Per Share (Notes)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Net Income (Loss) Per Share
Net Income (Loss) Per Share

The following table sets forth the computation of Net Income (Loss) Per Share for the years ended December 31, 2018, 2017 and 2016 (in thousands, except per share data):
 
2018
 
2017
 
2016
Numerator for Basic and Diluted Earnings per Share -
 
 
 
 
 
Net Income (Loss)
$
3,419,040

 
$
2,582,579

 
$
(1,096,686
)
Denominator for Basic Earnings per Share -
 

 
 

 
 

Weighted Average Shares
576,578

 
574,620

 
553,384

Potential Dilutive Common Shares -
 

 
 

 
 

Stock Options/SARs
1,137

 
1,466

 
—

Restricted Stock/Units and Performance Units/Stock
2,726

 
2,607

 
—

Denominator for Diluted Earnings per Share -
 

 
 

 
 

Adjusted Diluted Weighted Average Shares
580,441

 
578,693

 
553,384

Net Income (Loss) Per Share
 

 
 

 
 

Basic
$
5.93

 
$
4.49

 
$
(1.98
)
Diluted
$
5.89

 
$
4.46

 
$
(1.98
)


The diluted earnings per share calculation excludes stock options, SARs, restricted stock and units and performance units and stock that were anti-dilutive.  Shares underlying the excluded stock options and SARs totaled 0.6 million, 2.6 million and 10.3 million for the years ended December 31, 2018, 2017 and 2016, respectively. For the year ended December 31, 2016, 4.5 million shares of restricted stock and restricted stock units and performance units and performance stock were excluded.