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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2020
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 three and six months ended June 30, 2020 and June 30, 2019:
For the Three Months Ended June 30,For the Six Months
Ended June 30,
2020201920202019
Weighted average common shares outstanding for basic calculation267,249,580  290,565,408  268,233,233  290,562,234  
Add: Effect of stock options, deferred share units and restricted stock units10,815  8,745  10,764  8,898  
Weighted average common shares outstanding for diluted calculation267,260,395  290,574,153  268,243,997  290,571,132