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Net Income (Loss) Per Share
 12 Months Ended
Dec. 31, 2015
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, 2015, 2014 and 2013 (in thousands, except per share data):
 
2015
 
2014
 
2013
Numerator for Basic and Diluted Earnings per Share -
 
 
 
 
 
Net Income (Loss)
$
(4,524,515
)
 
$
2,915,487

 
$
2,197,109

Denominator for Basic Earnings per Share -
 

 
 

 
 

Weighted Average Shares
545,697

 
543,443

 
540,341

Potential Dilutive Common Shares -
 

 
 

 
 

Stock Options/SARs
—

 
2,526

 
2,316

Restricted Stock/Units and Performance Units/Stock
—

 
2,570

 
3,570

Denominator for Diluted Earnings per Share -
 

 
 

 
 

Adjusted Diluted Weighted Average Shares
545,697

 
548,539

 
546,227

Net Income (Loss) Per Share
 

 
 

 
 

Basic
$
(8.29
)
 
$
5.36

 
$
4.07

Diluted
$
(8.29
)
 
$
5.32

 
$
4.02



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 10.2 million, 0.7 million and 0.3 million for the years ended December 31, 2015, 2014 and 2013, respectively. For the year ended December 31, 2015, 5.3 million shares of restricted stock and restricted stock units and performance units and performance stock were excluded.