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Earnings Per Share | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
Earnings per Share | Earnings per Share During the six months ended June 30, 2020, we repurchased 3,328,574 shares of our common stock under the repurchase program that was approved on July 30, 2019. These shares were subsequently retired. There were no shares repurchased under this program during the three months ended June 30, 2020. 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, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Weighted average common shares outstanding for basic calculation | 267,249,580 |  |  | 290,565,408 |  |  | 268,233,233 |  |  | 290,562,234 |
Add: Effect of stock options, deferred share units and restricted stock units | 10,815 |  |  | 8,745 |  |  | 10,764 |  |  | 8,898 |
Weighted average common shares outstanding for diluted calculation | 267,260,395 |  |  | 290,574,153 |  |  | 268,243,997 |  |  | 290,571,132 |
Basic earnings per common share are calculated by dividing net income (loss) by the weighted average number of common shares outstanding, which includes 65,062 and 59,166 shares of participating securities in the three and six months ended June 30, 2020, respectively. Diluted earnings per share are calculated by dividing net income (loss) by the sum of the weighted average number of common shares outstanding plus the additional common shares that would have been outstanding if potentially dilutive securities had been issued. The weighted average common shares outstanding for the diluted earnings per share calculation excludes consideration of 1,734,610 and 1,603,198 equivalent shares and 1,288,003 and 1,127,885 equivalent shares in the three and six months ended June 30, 2020 and June 30, 2019, respectively, as these shares are anti-dilutive.

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