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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2016
Capital Stock [Abstract] |
Summary of Common Share Activity | A summary of common share activity for the years ended December 31 follows (in shares):
|  | 2016 |  | 2015 |  | 2014
Common shares outstanding at January 1 |  | 139,441,298 |  |  | 139,000,471 |  |  | 138,207,889 |
Shares repurchased |  | (162,563 | ) |  | (165,138 | ) |  | (36,702 | )
Shares issued upon exercise of employee stock options |  | 348,640 |  |  | 207,890 |  |  | 744,431 |
Restricted stock issued to employees, net of forfeitures |  | 187,209 |  |  | 375,575 |  |  | 60,933 |
Shares issued to non-employee directors |  | 25,644 |  |  | 22,500 |  |  | 23,920 |
Common shares outstanding at December 31 |  | 139,840,228 |  |  | 139,441,298 |  |  | 139,000,471 |

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