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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2011
Notes To Financial Statements [Abstract]  
Computation of Net Income Per Share Available to Common Stockholders
The following table sets forth the computation of Net Income Per Share for the years ended December 31, 2011, 2010 and 2009 (in thousands, except per share data):

   
2011
  
2010
  
2009
 
           
Numerator for Basic and Diluted Earnings per Share -
         
Net Income
 $1,091,123  $160,654  $546,627 
Denominator for Basic Earnings per Share -
            
Weighted Average Shares
  262,735   250,876   248,996 
Potential Dilutive Common Shares -
            
Stock Options/SARs
  1,707   1,991   1,691 
Restricted Stock and Restricted Stock Units
  1,826   1,633   1,197 
Denominator for Diluted Earnings per Share -
            
Adjusted Diluted Weighted Average Shares
  266,268   254,500   251,884 
Net Income Per Share
            
Basic
 $4.15  $0.64  $2.20 
Diluted
 $4.10  $0.63  $2.17