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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2019
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 2017:
| Year Ended December 31, |
| 2019 |  |  | 2018 |  |  | 2017 |
Beginning balance |  | 249,510,022 |  |  |  | 248,129,430 |  |  |  | 247,144,356 |
Restricted stock grants |  | 1,186,290 |  |  |  | 865,095 |  |  |  | 539,096 |
Restricted stock units vested |  | 720,212 |  |  |  | 434,046 |  |  |  | 344,937 |
Performance stock units issued |  | 12,747 |  |  |  | 76,149 |  |  |  | 85,461 |
Treasury shares |  | (1,798,468 | ) |  |  | 5,302 |  |  |  | 15,580 |
Ending balance |  | 249,630,803 |  |  |  | 249,510,022 |  |  |  | 248,129,430 |
Schedule of Change in Treasury Shares | The following is a schedule of change in treasury shares since the beginning of 2017:
| Year Ended December 31, |
| 2019 |  |  | 2018 |  |  | 2017 |
Beginning balance |  | 9,665 |  |  |  | 14,967 |  |  |  | 30,547 |
Rabbi trust shares distributed and/or sold |  | (1,532 | ) |  |  | (5,302 | ) |  |  | (15,580 | )
Shares repurchased |  | 1,800,000 |  |  |  | — |  |  |  | — |
Ending balance |  | 1,808,133 |  |  |  | 9,665 |  |  |  | 14,967 |

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