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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2019
Capital Stock [Abstract] |
Summary of Common Share Activity | A summary of common share activity for the years ended December 31 follows (in shares):
|  | 2019 |  | 2018 |  | 2017
Common shares outstanding at January 1 |  | 135,173,948 |  |  | 134,275,609 |  |  | 139,840,228 |
Shares repurchased |  | (106,388 | ) |  | (92,167 | ) |  | (6,157,010 | )
Shares issued upon exercise of employee stock options |  | 70,000 |  |  | — |  |  | 299,050 |
Restricted stock issued to employees, net of forfeitures |  | 416,695 |  |  | 958,672 |  |  | 269,025 |
Shares issued to non-employee directors |  | 23,623 |  |  | 31,834 |  |  | 24,316 |
Common shares outstanding at December 31 |  | 135,577,878 |  |  | 135,173,948 |  |  | 134,275,609 |

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