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Net Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings per share [abstract]  
Net earnings (loss) per common share
 
 
 
2019


2018


2017

Weighted average common shares outstanding
– basic (thousands of shares)
 
1,190,977


1,218,798


1,175,094

Effect of dilutive stock options (thousands of shares)
 
2,129


4,960


7,729

Weighted average common shares outstanding
– diluted (thousands of shares)
 
1,193,106

 
1,223,758

 
1,182,823

Net earnings
 
$
5,416


$
2,591


$
2,397

Net earnings per common share
– basic
 
$
4.55


$
2.13


$
2.04

 
– diluted
 
$
4.54


$
2.12


$
2.03