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Earnings Per Share
6 Months Ended
Jun. 30, 2011
Earnings Per Share [Abstract]  
Earnings Per Share
3. Earnings Per Share
     A reconciliation of the numerators and the denominators of our basic and diluted per-share computations follows:
                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
    (In thousands, except per share data)  
Net income — basic (numerator):
  $ 266,586     $ 224,393     $ 517,198     $ 515,246  
Effect of dilutive potential shares
                               
Convertible debentures
          32             56  
     
Net income including conversions — diluted (numerator)
  $ 266,586     $ 224,425     $ 517,198     $ 515,302  
     
 
                               
Weighted average shares — basic (denominator):
    139,027       139,026       139,027       139,026  
Effect of dilutive potential shares
                               
Convertible debentures
          32             42  
Stock options and stock appreciation rights
    25       21       25       36  
     
Weighted average shares including conversions — diluted (denominator)
    139,052       139,079       139,052       139,104  
     
Earnings per share:
                               
Basic
  $ 1.92     $ 1.61     $ 3.72     $ 3.71  
     
Diluted
  $ 1.92     $ 1.61     $ 3.72     $ 3.70  
     
     The following table sets forth the share effects of stock options and the number of stock appreciation rights excluded from our computations of diluted earnings per share, or EPS, as the inclusion of such potentially dilutive shares would have been antidilutive for the periods presented:
                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
            (In thousands)          
Employee and director:
                               
Stock options
    8       8       8       4  
Stock appreciation rights
    693       672       669       557