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Earnings Per Share
 12 Months Ended
Dec. 31, 2012
Earnings Per Share Disclosure [Abstract]  
Earnings Per Share

Note 17 EARNINGS PER SHARE

The following table sets forth the computation of basic and diluted earnings per share on net income (in thousands, except per share information):

 2012 2011 2010
Earnings:        
 Net income (numerator for basic and diluted calculations)$ 631,893 $ 546,045 $ 535,742
Shares:        
 Weighted average outstanding shares (denominator for basic calculations)        
    73,737   73,586   73,157
Equivalent shares from outstanding stock options and warrants  416   522   1,537
  Diluted shares (denominator for diluted calculations)  74,153   74,108   74,694
Earnings per share:        
 Basic$8.57 $7.42 $7.32
 Diluted$8.52 $7.37 $7.17

The calculation of common equivalent shares does not include the impact of options having a strike or conversion price that exceeds the average stock price for the earnings period, as the result would be antidilutive. The calculation of common equivalent shares also excludes the impact of outstanding performance contingent shares, as the conditions necessary for their issuance have not been satisfied as of the end of the reporting period. Approximately 1.8 million, 1.1 million and 0.7 million outstanding stock options were not included in the calculation of common equivalent shares during 2012, 2011 and 2010, respectively. Approximately 0.7 million, 0.8 million and 0.7 million performance contingent shares were excluded from the calculation of common equivalent shares during 2012, 2011 and 2010, respectively.