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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2012
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, 2012, 2011 and 2010 (in thousands, except per share data):

 
 
2012
 
2011
 
2010
 
 
 
 
 
 
 
Numerator for Basic and Diluted Earnings per Share -
 
 
 
 
 
 
 
Net Income
$
570,279
$
1,091,123
$
160,654
Denominator for Basic Earnings per Share -
 
 
 
 
 
 
 
Weighted Average Shares
 
267,577
 
262,735
 
250,876
Potential Dilutive Common Shares -
 
 
 
 
 
 
 
Stock Options/SARs
 
1,456
 
1,707
 
1,991
 
Restricted Stock/Units and Performance Units/Stock
 
1,729
 
1,826
 
1,633
Denominator for Diluted Earnings per Share -
 
 
 
 
 
 
 
Adjusted Diluted Weighted Average Shares
 
270,762
 
266,268
 
254,500
 
 
 
Net Income Per Share
 
 
 
Basic
$
2.13
$
4.15
$
0.64
 
Diluted
$
2.11
$
4.10
$
0.63