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Capital Stock (Tables) | 9 Months Ended
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Sep. 30, 2021
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 2020:
|  | Nine Months Ended September 30, 2021 |  |  | Year Ended December 31, 2020 |
Beginning balance |  |  | 246,348,092 |  |  |  | 249,630,803 |
Restricted stock grants |  |  | 1,293,126 |  |  |  | 3,390,358 |
Restricted stock units vested |  |  | 1,485,557 |  |  |  | 1,226,473 |
Performance stock units issued |  |  | 640,468 |  |  |  | 279,420 |
Performance stock dividends |  |  | 13,966 |  |  |  | 18,700 |
Treasury shares |  |  | 3,149 |  |  |  | (8,197,662 | )
Ending balance |  |  | 249,784,358 |  |  |  | 246,348,092 |
Schedule of Change in Treasury Shares | The following is a schedule of the change in treasury shares for the three and nine months ended September 30, 2021:
|  | Three Months Ended September 30, 2021 |  |  | Nine Months Ended September 30, 2021 |
Beginning balance |  |  | 10,005,504 |  |  |  | 10,005,795 |
Rabbi trust shares distributed/sold |  |  | (2,858 | ) |  |  | (3,149 | )
Shares repurchased |  |  | — |  |  |  | — |
Ending balance |  |  | 10,002,646 |  |  |  | 10,002,646 |

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