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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Calculation of our Basic and Diluted Earnings per share Calculation
The following table shows the information used in the calculation of our basic and diluted earnings per share calculation for the six months ended June 30, 2021 and 2020:
For the Three Months Ended June 30,For the Six Months
Ended June 30,
2021202020212020
Weighted average common shares outstanding for basic calculation267,560,712 267,249,580 267,440,501 268,233,233 
Add: Effect of stock options, deferred share units and restricted stock units247,232 10,815 324,877 10,764 
Weighted average common shares outstanding for diluted calculation267,807,944 267,260,395 267,765,378 268,243,997