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Share Capital (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Dividends Declared and Recorded in the Consolidated Financial Statements | The table below describes the dividends declared and recorded in the consolidated financial statements in 2017.
|  |  |  |  |  | Dividend per Share |  |  | Paid |
Date Declared |  | Record Date |  | Payment Date |  | $ |  |  | $ |
February 22, 2017 |  | March 31, 2017 |  | April 13, 2017 |  |  | 0.1250 |  |  |  | 14.3 |
May 10, 2017 |  | June 30, 2017 |  | July 13, 2017 |  |  | 0.1250 |  |  |  | 14.2 |
August 8, 2017 |  | September 29, 2017 |  | October 12, 2017 |  |  | 0.1250 |  |  |  | 14.2 |
November 8, 2017 |  | December 31, 2017 |  | January 11, 2018 |  |  | 0.1250 |  |  |  | - |
Summary of Granted Share Options | The Company has granted share options to officers and employees to purchase 4,426,237 shares at prices from $14.33 to $32.90 per share. These options expire on dates between January 28, 2018, and May 16, 2022.
|  | For the year ended |  |  | For the year ended |
|  | December 31 |  |  | December 31 |
|  | 2017 |  |  | 2016 |
|  |  |  |  | Weighted Average |  |  |  |  |  | Weighted Average |
|  |  |  |  | Exercise Price |  |  |  |  |  | Exercise Price |
|  | Shares |  |  | per share |  |  | Shares |  |  | per share |
|  | # |  |  | $ |  |  | # |  |  | $ |
Share options, beginning of the year |  |  | 3,655,020 |  |  |  | 28.33 |  |  |  | 2,980,601 |  |  |  | 26.17 |
Granted |  |  | 1,229,689 |  |  |  | 31.75 |  |  |  | 995,904 |  |  |  | 32.83 |
Exercised |  |  | (376,160 | ) |  |  | 21.09 |  |  |  | (254,156 | ) |  |  | 19.76 |
Forfeited |  |  | (82,312 | ) |  |  | 31.57 |  |  |  | (67,329 | ) |  |  | 31.45 |
Share options, end of the year |  |  | 4,426,237 |  |  |  | 29.84 |  |  |  | 3,655,020 |  |  |  | 28.33 |
Summary of Outstanding Share Options | The options held by officers and employees at December 31, 2017, were as follows:
Options Outstanding |  |  |  |  | Options Exercisable |
|  |  |  |  |  |  |  | Weighted |  |  |  |  |  |  |  |  |  |  | Weighted |
|  |  |  |  | Weighted |  |  | Average |  |  |  |  |  |  |  | Weighted |  |  | Average |
|  |  |  |  | Average |  |  | Exercise |  |  |  |  |  |  |  | Average |  |  | Exercise |
Range of Exercise |  |  |  |  | Remaining |  |  | Price per |  |  |  |  | Shares |  |  | Remaining |  |  | Price per |
Prices per share |  | Outstanding |  |  | Contractual |  |  | share |  |  |  |  | Exercisable |  |  | Contractual |  |  | share |
$ |  | # |  |  | Life in Years |  |  | $ |  |  |  |  | # |  |  | Life in Years |  |  | $ |
14.33 – 14.88 |  |  | 337,714 |  |  |  | 0.87 |  |  |  | 14.73 |  |  |  |  |  | 337,714 |  |  |  | 0.87 |  |  |  | 14.73 |
20.88 |  |  | 432,367 |  |  |  | 2.16 |  |  |  | 20.88 |  |  |  |  |  | 432,367 |  |  |  | 2.16 |  |  |  | 20.88 |
31.75 – 32.90 |  |  | 3,656,156 |  |  |  | 3.86 |  |  |  | 32.29 |  |  |  |  |  | 1,516,836 |  |  |  | 3.58 |  |  |  | 32.56 |
14.33 – 32.90 |  |  | 4,426,237 |  |  |  | 3.46 |  |  |  | 29.84 |  |  |  |  |  | 2,286,917 |  |  |  | 2.91 |  |  |  | 27.72 |
Summary of Weighted Average Assumptions | The estimated fair value of options granted at the share market price on the grant date was $5.03 per share (2016 – $5.22) and was determined using the weighted average assumptions indicated below:
|  | 2017 |  |  | 2016 |
Volatility in the price of the Company’s shares (%) |  |  | 24.13 |  |  |  | 23.73 |
Risk-free interest rate (%) |  |  | 0.81 |  |  |  | 0.76 |
Expected hold period to exercise (years) |  |  | 3.50 |  |  |  | 3.50 |
Dividend yield (%) |  |  | 1.575 |  |  |  | 1.370 |
Exercise price ($) |  |  | 31.75 |  |  |  | 32.83 |
Summary of Non-Vested Options | A summary of the status of the Company’s non-vested options as at December 31, 2017, and of changes in the period are as follows:
|  |  |  |  | Weighted Average |
|  |  |  |  | Grant Date |
|  | Number of Shares |  |  | Fair Value |
|  | Subject to Option |  |  | per share |
|  | # |  |  | $ |
Non-vested share options, beginning of the year |  |  | 1,826,629 |  |  |  | 5.78 |
Granted |  |  | 1,229,689 |  |  |  | 5.03 |
Vested |  |  | (852,874 | ) |  |  | 5.98 |
Forfeited |  |  | (64,124 | ) |  |  | 5.46 |
Non-vested share options, end of the year |  |  | 2,139,320 |  |  |  | 5.28 |

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