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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Reconciliation Of Earnings Per Share Basic And Diluted
 
 
2012
 
2011
 
2010
Numerator:
 
 
 
 
 
 
Income from continuing operations used in computing basic and diluted earnings per share
 
$
623,925

 
$
548,078

 
$
259,669

Denominator:
 
 
 
 
 
 
Denominator for basic earnings per share-weighted-average common shares
 
227,119

 
232,889

 
233,312

Effect of dilutive securities – employee stock compensation plan
 
2,110

 
2,029

 
1,475

Denominator for diluted earnings per share- adjusted weighted-average shares outstanding
 
229,229

 
234,918

 
234,787

Earnings per common share from continuing operations:
 
 
 
 
 
 
Basic
 
$
2.75

 
$
2.35

 
$
1.11

Diluted
 
$
2.72

 
$
2.33

 
$
1.11