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Net Income (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Computation of Net Income (Loss) Per Share
The following table sets forth the computation of Net Income (Loss) Per Share for the years ended December 31, 2017, 2016 and 2015 (in thousands, except per share data):
 
2017
 
2016
 
2015
Numerator for Basic and Diluted Earnings per Share -
 
 
 
 
 
Net Income (Loss)
$
2,582,579

 
$
(1,096,686
)
 
$
(4,524,515
)
Denominator for Basic Earnings per Share -
 

 
 

 
 

Weighted Average Shares
574,620

 
553,384

 
545,697

Potential Dilutive Common Shares -
 

 
 

 
 

Stock Options/SARs
1,466

 
—

 
—

Restricted Stock/Units and Performance Units/Stock
2,607

 
—

 
—

Denominator for Diluted Earnings per Share -
 

 
 

 
 

Adjusted Diluted Weighted Average Shares
578,693

 
553,384

 
545,697

Net Income (Loss) Per Share
 

 
 

 
 

Basic
$
4.49

 
$
(1.98
)
 
$
(8.29
)
Diluted
$
4.46

 
$
(1.98
)
 
$
(8.29
)