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Share capital (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of share capital, reserves and other equity interest [Abstract] |
Disclosure of number and weighted average exercise prices of share options | A summary of changes to stock options outstanding is as follows:
|  | Number of outstanding options |  |  | Weighted- average exercise price |
|  | (‘000’s) |  |  | (in Cdn.$) |
Outstanding at December 31, 2016 |  | 50,410 |  |  | 2.24 |
Granted |  | 22,968 |  |  | 3.65 |
Exercised |  | (13,708 | ) |  | 2.54 |
Forfeited or expired |  | (2,068 | ) |  | 3.27 |
Outstanding at December 31, 2017 |  | 57,602 |  |  | 2.70 |
Granted |  | 25,380 |  |  | 3.35 |
Exercised |  | (12,347 | ) |  | 2.40 |
Forfeited or expired |  | (3,003 | ) |  | 3.50 |
Outstanding at December 31, 2018 |  | 67,632 |  |  | 2.96 |
Disclosure of range of exercise prices of outstanding share options | Stock options outstanding and exercisable as at December 31, 2018 are as follows:
Range of exercise prices (in Cdn.$) | Number of outstanding options (‘000’s) |  | Weighted- average years to expiry |  | Weighted-average exercise price (in Cdn.$) |  | Number of exercisable options (‘000’s) |  | Weighted-average exercise price (in Cdn.$) |
1.12 – 1.99 | 8,513 |  | 2.09 |  | 1.12 |  | 7,558 |  | 1.12 |
2.00 – 2.99 | 10,610 |  | 1.35 |  | 2.08 |  | 10,174 |  | 2.05 |
3.00 – 3.99 | 48,434 |  | 3.91 |  | 3.47 |  | 19,590 |  | 3.50 |
4.00 – 4.99 | 75 |  | 3.10 |  | 4.05 |  | 50 |  | 4.05 |
| 67,632 |  | 3.28 |  | 2.96 |  | 37,372 |  | 2.63 |
Disclosure of number and weighted average remaining contractual life of outstanding share options | Stock options outstanding and exercisable as at December 31, 2018 are as follows:
Range of exercise prices (in Cdn.$) | Number of outstanding options (‘000’s) |  | Weighted- average years to expiry |  | Weighted-average exercise price (in Cdn.$) |  | Number of exercisable options (‘000’s) |  | Weighted-average exercise price (in Cdn.$) |
1.12 – 1.99 | 8,513 |  | 2.09 |  | 1.12 |  | 7,558 |  | 1.12 |
2.00 – 2.99 | 10,610 |  | 1.35 |  | 2.08 |  | 10,174 |  | 2.05 |
3.00 – 3.99 | 48,434 |  | 3.91 |  | 3.47 |  | 19,590 |  | 3.50 |
4.00 – 4.99 | 75 |  | 3.10 |  | 4.05 |  | 50 |  | 4.05 |
| 67,632 |  | 3.28 |  | 2.96 |  | 37,372 |  | 2.63 |
Disclosure of number and weighted average exercise prices of other equity instruments | Summary of changes to RSUs outstanding:
| Number of outstanding RSUs |
| (‘000’s) |
Outstanding at December 31, 2016 | 1,237 |
Granted | 1,793 |
Vested and converted to common shares | (1,760 | )
Outstanding at December 31, 2017 | 1,270 |
Granted | 1,455 |
Vested and converted to common shares | (671 | )
Outstanding at December 31, 2018 | 2,054 |
Earnings per share | The following is the calculation of diluted net income attributable to shareholders of the Company for the year:
|  | 2018 |  |  | 2017 |
|  | $ |  |  | $ |
Net income for the year (attributable to shareholders of the Company) |  | $ | 28,938 |  |  | $ | 56,852 |
Dilutive impact of gain on fair value of convertible notes |  | (10,651 | ) |  | — |
Diluted net income for the year (attributable to shareholders of the Company) |  | $ | 18,287 |  |  | $ | 56,852 |
The following is the calculation of diluted weighted average number of common shares outstanding for the year:
|  | 2018 |  |  | 2017 |
|  | $ |  |  | $ |
Basic weighted average number of common shares outstanding (in thousands) |  | 986,755 |  |  | 976,366 |
Effect of dilutive securities: |  |  |  |
Convertible notes |  | 49,393 |  |  | — |
Stock options |  | 10,762 |  |  | 14,627 |
Restricted share units |  | 458 |  |  | 420 |
Diluted weighted average number of common shares outstanding (in thousands) |  | 1,047,368 |  |  | 991,413 |
The following is the basic and diluted earnings per share:
|  | 2018 |  |  | 2017 |
|  | $ |  |  | $ |
Earnings per share (attributable to shareholders of the Company) |  |  |  |
Basic |  | $ | 0.03 |  |  | $ | 0.06 |
Diluted |  | $ | 0.02 |  |  | $ | 0.06 |

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