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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2022
Equity [Abstract] |
Summary of Common Share Activity | A summary of common share activity for the years ended December 31 follows (in shares):
|  | 2022 |  | 2021 |  | 2020
Common shares outstanding at January 1 |  | 126,131,799 |  |  | 134,801,030 |  |  | 135,577,878 |
Shares repurchased |  | (6,574,610) |  |  | (9,121,328) |  |  | (1,240,328) |
Restricted stock issued to employees, net of forfeitures |  | 370,178 |  |  | 435,129 |  |  | 439,700 |
Shares issued to non-employee directors |  | 17,935 |  |  | 16,968 |  |  | 23,780 |
Common shares outstanding at December 31 |  | 119,945,302 |  |  | 126,131,799 |  |  | 134,801,030 |

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