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Share-based compensation plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract] |
Schedule of number of stock options and weighted avearge exercisable price |
(Number of options) | 2018 |  | 2017
Beginning of year | 8,324,666 |  | 8,020,311
Options granted | 1,473,430 |  | 1,373,040
Options forfeited | (315,340) |  | (564,423)
Options expired | (661,951) |  | (504,052)
Options exercised [note 16] | - |  | (210)
End of year | 8,820,805 |  | 8,324,666
Exercisable | 6,007,557 |  | 5,809,077
Weighted average exercise prices were as follows: |  |  |  |  |
|  | 2018 |  |  | 2017
Beginning of year |  | $22.19 |  |  | $23.61
Options granted |  | 11.32 |  |  | 14.70
Options forfeited |  | 25.43 |  |  | 26.49
Options expired |  | 28.90 |  |  | 19.50
Options exercised |  | - |  |  | 19.37
End of year |  | $19.75 |  |  | $22.19
Exercisable |  | $22.83 |  |  | $24.95
Total options outstanding and exercisable |
Total options outstanding and exercisable at December 31, 2018 were as follows:
|  |  |  |  | Options outstanding | Options exercisable
| Option price per share | Number |  | Weighted average remaining life | Weighted average exercisable price | Number | Weighted average exercisable price
| $11.32 - 17.84 | 4,119,810 |  |  | 5.8 |  | $14.01 | 1,306,562 |  | $15.79
| $17.85 - 39.53 | 4,700,995 |  |  | 2 |  | $24.79 | 4,700,995 |  | $24.79
|  | 8,820,805 |  |  |  |  |  | 6,007,557 |  |
The foregoing options have expiry dates ranging from February 28, 2019 to February 28, 2026.
Compensation expense under equity settled plans |
|  | 2018 |  |  | 2017
Stock option plan | $ | 4,744 |  | $ | 4,941
Performance share unit plan |  | 7,690 |  |  | 6,186
Restricted share unit plan |  | 2,542 |  |  | 2,833
Employee share ownership plan |  | 3,845 |  |  | 4,473
Total | $ | 18,821 |  | $ | 18,433
Expenses (recoveries) cash-settled plans |
|  | 2018 |  | 2017
Deferred share unit plan | $ | 2,922 | $ | (42)
Phantom stock option plan |  | 675 |  | 176
Total | $ | 3,597 | $ | 134
Equity-settled plan [Member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Inputs measurement fair value of sharebased plans |
| Stock option plan | PSU | RSU
Number of options granted |  |  | 1,473,430 |  | 602,530 |  | 377,021
Average strike price |  |  | $11.32 |  | - |  | $11.46
Expected dividend |  |  | $0.08 |  | - |  | -
Expected volatility |  |  | 35% |  | 37% |  | -
Risk-free interest rate |  |  | 2.0% |  | 1.9% |  | -
Expected life of option |  |  | 4.8 years |  | 3 years |  | -
Expected forfeitures |  |  | 7% |  | 9% |  | 13%
Weighted average grant date fair values |  |  | $3.48 |  | $11.43 |  | $11.46
Phantom Stock Option Plan [member] |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Inputs measurement fair value of sharebased plans |
| Grant date | Reporting date
| March 1, 2018 | December 31, 2018
Number of units |  | 101,895 |  | 353,580
Average strike price |  | $11.32 |  | $17.74
Expected dividend |  | $0.08 |  | $0.08
Expected volatility |  | 35% |  | 37%
Risk-free interest rate |  | 1.9% |  | 1.9%
Expected life of option |  | 4.5 years |  | 3.7 years
Expected forfeitures |  | 7% |  | 8%
Weighted average measurement date fair values |  | $3.68 |  | $4.21

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