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Net Income Per Share
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Net Income Per Share
9.  Net Income Per Share

The following table sets forth the computation of Net Income Per Share for the years ended December 31, 2014, 2013 and 2012 (in thousands, except per share data):
 
2014
 
2013
 
2012
Numerator for Basic and Diluted Earnings per Share -
 
 
 
 
 
Net Income
$
2,915,487

 
$
2,197,109

 
$
570,279

Denominator for Basic Earnings per Share -
 

 
 

 
 

Weighted Average Shares
543,443

 
540,341

 
535,155

Potential Dilutive Common Shares -
 

 
 

 
 

Stock Options/SARs
2,526

 
2,316

 
2,911

Restricted Stock/Units and Performance Units/Stock
2,570

 
3,570

 
3,458

Denominator for Diluted Earnings per Share -
 

 
 

 
 

Adjusted Diluted Weighted Average Shares
548,539

 
546,227

 
541,524

Net Income Per Share
 

 
 

 
 

Basic
$
5.36

 
$
4.07

 
$
1.07

Diluted
$
5.32

 
$
4.02

 
$
1.05



The diluted earnings per share calculation excludes stock options and SARs that were anti-dilutive.  Shares underlying the excluded stock options and SARs totaled 0.7 million, 0.3 million and 0.5 million for the years ended December 31, 2014, 2013 and 2012, respectively.