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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Reconciliation Of Earnings Per Share Basic And Diluted
The following table sets forth the computation of basic and diluted earnings per share from continuing operations for the years ended December 31 (in thousands except per share amounts): 
 
 
2015
 
2014
 
2013
Numerator:
 
 
 
 
 
 
Income used in computing basic and diluted earnings per share
 
$
752,207

 
$
844,611

 
$
733,993

Denominator:
 
 
 
 
 
 
Denominator for basic earnings per share-weighted-average common shares
 
202,681

 
216,305

 
222,475

Effect of dilutive securities – employee stock compensation plan
 
1,005

 
1,401

 
1,596

Denominator for diluted earnings per share- adjusted weighted-average shares outstanding
 
203,686

 
217,706

 
224,071

Earnings per common share:
 
 
 
 
 
 
Basic
 
$
3.71

 
$
3.90

 
$
3.30

Diluted
 
$
3.69

 
$
3.88

 
$
3.28