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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 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:
| Year Ended December 31, |  |
| 2020 |  |  | 2019 |  |
Beginning balance |  | 249,630,803 |  |  |  | 249,510,022 |  |
Restricted stock grants |  | 3,390,358 |  |  |  | 1,186,290 |  |
Restricted stock units vested |  | 1,226,473 |  |  |  | 720,212 |  |
Performance stock units issued |  | 279,420 |  |  |  | 12,283 |  |
Performance stock dividends |  | 18,700 |  |  |  | 464 |  |
Treasury shares |  | (8,197,662 | ) |  |  | (1,798,468 | ) |
Ending balance |  | 246,348,092 |  |  |  | 249,630,803 |  |
Schedule of Change in Treasury Shares | The following is a schedule of the change in treasury shares since the beginning of 2019:
| Year Ended December 31, |  |  |
| 2020 |  |  | 2019 |  |  |
Beginning balance |  | 1,808,133 |  |  |  | 9,665 |  |  |
Rabbi trust shares distributed and/or sold |  | (2,338 | ) |  |  | (1,532 | ) |  |
Shares repurchased |  | 8,200,000 |  |  |  | 1,800,000 |  |  |
Ending balance |  | 10,005,795 |  |  |  | 1,808,133 |  |  |

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