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Net Earnings Per Common Share
 12 Months Ended
Dec. 31, 2020
Earnings per share [abstract]  
Net Earnings Per Common Share Net Earnings Per Common Share
 
 
2020

2019

2018
Weighted average common shares outstanding
– basic (thousands of shares)
1,181,768 

1,190,977 

1,218,798 
Effect of dilutive stock options (thousands of shares)
— 

2,129 

4,960 
Weighted average common shares outstanding
– diluted (thousands of shares)
1,181,768 1,193,106 1,223,758 
Net earnings (loss)
$(435)

$5,416 

$2,591 
Net earnings (loss) per common share
– basic
$(0.37)

$4.55 

$2.13 
 
– diluted
$(0.37)

$4.54 

$2.12 
In 2020, the Company excluded 44,117,000 potentially anti-dilutive stock options from the calculation of diluted earnings per common share (year ended December 31, 2019 – 36,834,000; 2018 – 23,458,000).