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Share Capital (Tables) | 12 Months Ended
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Dec. 31, 2018
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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 2018.
|  |  |  |  |  | Dividend per Share |  | Paid |
Date Declared |  | Record Date |  | Payment Date |  | $ |  | $ |
February 21, 2018 |  | March 29, 2018 |  | April 12, 2018 |  | 0.1375 |  |  | 15.7 |
May 9, 2018 |  | June 29, 2018 |  | July 12, 2018 |  | 0.1375 |  |  | 15.6 |
August 7, 2018 |  | September 28, 2018 |  | October 11, 2018 |  | 0.1375 |  |  | 15.7 |
November 7, 2018 |  | December 28, 2018 |  | January 10, 2019 |  | 0.1375 |  |  | - |
Summary of Granted Share Options | The Company has granted share options to officers and employees to purchase 4,987,542 shares at prices from $14.88 to $32.98 per share. These options expire on dates between February 28, 2019, and May 15, 2023.
|  | For the year ended |  |  | For the year ended |
|  | December 31 |  |  | December 31 |
|  | 2018 |  |  | 2017 |
|  |  |  |  | Weighted Average |  |  |  |  |  | Weighted Average |
|  |  |  |  | Exercise Price |  |  |  |  |  | Exercise Price |
|  | Shares |  |  | per Share |  |  | Shares |  |  | per Share |
|  | # |  |  | $ |  |  | # |  |  | $ |
Share options, beginning of the year |  |  | 4,426,237 |  |  |  | 29.84 |  |  |  | 3,655,020 |  |  |  | 28.33 |
Granted |  |  | 1,112,779 |  |  |  | 32.98 |  |  |  | 1,229,689 |  |  |  | 31.75 |
Exercised |  |  | (338,989 | ) |  |  | 20.40 |  |  |  | (376,160 | ) |  |  | 21.09 |
Forfeited |  |  | (212,485 | ) |  |  | 31.49 |  |  |  | (82,312 | ) |  |  | 31.57 |
Share options, end of the year |  |  | 4,987,542 |  |  |  | 31.11 |  |  |  | 4,426,237 |  |  |  | 29.84 |
Summary of Outstanding Share Options | The options held by officers and employees at December 31, 2018, 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 |  | $
14.88 |  | 142,540 |  | 0.16 |  | 14.88 |  |  |  | 142,540 |  | 0.16 |  | 14.88
20.88 |  | 364,526 |  | 1.16 |  | 20.88 |  |  |  | 364,526 |  | 1.16 |  | 20.88
31.75 – 32.98 |  | 4,480,476 |  | 3.21 |  | 32.46 |  |  |  | 2,401,323 |  | 2.75 |  | 32.40
14.88 – 32.98 |  | 4,987,542 |  | 2.98 |  | 31.11 |  |  |  | 2,908,389 |  | 2.43 |  | 30.10
Summary of Weighted Average Assumptions | The estimated fair value of options granted at the share market price on the grant date was $5.73 per share (2017 – $5.03) and was determined using the weighted average assumptions indicated below:
|  | 2018 |  |  | 2017 |
Volatility in the price of the Company’s shares (%) |  |  | 24.12 |  |  |  | 24.13 |
Risk-free interest rate (%) |  |  | 2.10 |  |  |  | 0.81 |
Expected hold period to exercise (years) |  |  | 3.50 |  |  |  | 3.50 |
Dividend yield (%) |  |  | 1.668 |  |  |  | 1.575 |
Exercise price ($) |  |  | 32.98 |  |  |  | 31.75 |
Summary of Non-Vested Options | A summary of the status of the Company’s non-vested options as at December 31, 2018, and of changes in the year are as follows:
|  | Number of Shares Subject to Option |  |  | Weighted Average Grant Date Fair Value per Share |
|  | # |  |  | $ |
Non-vested share options, beginning of the year |  |  | 2,139,320 |  |  |  | 5.28 |
Granted |  |  | 1,112,779 |  |  |  | 5.73 |
Vested |  |  | (1,000,441 | ) |  |  | 5.24 |
Forfeited |  |  | (172,505 | ) |  |  | 5.40 |
Non-vested share options, end of the year |  |  | 2,079,153 |  |  |  | 5.53 |

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