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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2013
Net Income Per Share [Abstract]  
Computation of Net Income Per Share
The following table sets forth the computation of Net Income Per Share for the years ended December 31, 2013, 2012 and 2011 (in thousands, except per share data):

 
 
2013
  
2012
  
2011
 
 
 
  
  
 
Numerator for Basic and Diluted Earnings per Share -
 
  
  
 
Net Income
 
$
2,197,109
  
$
570,279
  
$
1,091,123
 
Denominator for Basic Earnings per Share -
            
Weighted Average Shares
  
270,170
   
267,577
   
262,735
 
Potential Dilutive Common Shares -
            
Stock Options/SARs
  
1,159
   
1,456
   
1,707
 
Restricted Stock/Units and Performance Units/Stock
  
1,785
   
1,729
   
1,826
 
Denominator for Diluted Earnings per Share -
            
Adjusted Diluted Weighted Average Shares
  
273,114
   
270,762
   
266,268
 
 
            
Net Income Per Share
            
Basic
 
$
8.13
  
$
2.13
  
$
4.15
 
Diluted
 
$
8.04
  
$
2.11
  
$
4.10