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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2017
Capital Stock [Abstract] |
Summary of Common Share Activity | A summary of common share activity for the years ended December 31 follows (in shares):
|  | 2017 |  | 2016 |  | 2015
Common shares outstanding at January 1 |  | 139,840,228 |  |  | 139,441,298 |  |  | 139,000,471 |
Shares repurchased |  | (6,157,010 | ) |  | (162,563 | ) |  | (165,138 | )
Shares issued upon exercise of employee stock options |  | 299,050 |  |  | 348,640 |  |  | 207,890 |
Restricted stock issued to employees, net of forfeitures |  | 269,025 |  |  | 187,209 |  |  | 375,575 |
Shares issued to non-employee directors |  | 24,316 |  |  | 25,644 |  |  | 22,500 |
Common shares outstanding at December 31 |  | 134,275,609 |  |  | 139,840,228 |  |  | 139,441,298 |

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