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Capital Stock (Tables) | 6 Months Ended
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Jun. 30, 2020
Equity [Abstract] |
Schedule of Changes in Number of Common Shares Outstanding | The following is a schedule of changes in the number of common shares outstanding since the beginning of 2019:
|  | Six Months Ended June 30, 2020 |  |  | Year Ended December 31, 2019 |
Beginning balance |  |  | 249,630,803 |  |  |  | 249,510,022 |
Restricted stock grants |  |  | 3,390,358 |  |  |  | 1,186,290 |
Restricted stock units vested |  |  | 952,719 |  |  |  | 720,212 |
Performance stock units issued |  |  | 279,420 |  |  |  | 12,747 |
Performance stock dividends |  |  | 18,700 |  |  |  | — |
Treasury shares acquired |  |  | (8,199,194 | ) |  |  | (1,798,468 | )
Ending balance |  |  | 246,072,806 |  |  |  | 249,630,803 |
Schedule of Change in Treasury Shares | The following is a schedule of the change in treasury shares for the three and six months ended June 30, 2020:
|  | Three Months Ended June 30, 2020 |  |  | Six Months Ended June 30, 2020 |
Beginning balance |  |  | 9,807,327 |  |  |  | 1,808,133 |
Rabbi trust shares distributed/sold |  |  | — |  |  |  | (806 | )
Shares repurchased |  |  | 200,000 |  |  |  | 8,200,000 |
Ending balance |  |  | 10,007,327 |  |  |  | 10,007,327 |

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