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Employee future benefits (Tables) | 12 Months Ended
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Dec. 31, 2018
Employee Benefits [Abstract] |
Disclosure of net defined benefit liability (asset) |
| Defined benefit obligation |  |  | Fair value of plan assets |  |  | Net defined benefit liability |
Defined benefit pension plan | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Balance at January 1 | $ | 17,603 |  |  | $ | 16,253 |  |  | $ | (12,809 | ) |  | $ | (11,282 | ) |  | $ | 4,794 |  |  | $ | 4,971 |
Included in profit or loss |  |  |  |  |  |  |  |  |  |  |
Current service cost | 57 |  |  | 32 |  |  | — |  |  | — |  |  | 57 |  |  | 32 |
Interest cost (income) | 621 |  |  | 658 |  |  | (455 | ) |  | (464 | ) |  | 166 |  |  | 194 |
Benefits payable | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
| 678 |  |  | 690 |  |  | (455 | ) |  | (464 | ) |  | 223 |  |  | 226 |
Included in other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Remeasurements loss (gain): |  |  |  |  |  |  |  |  |  |  |
Actuarial loss (gain) arising from: |  |  |  |  |  |  |  |  |  |  |
Demographic assumptions | (49 | ) |  | (99 | ) |  | — |  |  | — |  |  | (49 | ) |  | (99 | )
Financial assumptions | (1,331 | ) |  | 1,300 |  |  | — |  |  | — |  |  | (1,331 | ) |  | 1,300 |
Experience adjustment | (2 | ) |  | 111 |  |  | — |  |  | — |  |  | (2 | ) |  | 111 |
Return on plan assets excluding interest | — |  |  | — |  |  | 1,075 |  |  | (1,055 | ) |  | 1,075 |  |  | (1,055 | )
income |  |  |  |  |  |  |  |  |  |  |
Plan expenses | (35 | ) |  | (55 | ) |  | 35 |  |  | 55 |  |  | — |  |  | — |
| (1,417 | ) |  | 1,257 |  |  | 1,110 |  |  | (1,000 | ) |  | (307 | ) |  | 257 |
Other |  |  |  |  |  |  |  |  |  |  |
Contributions paid by the employer | — |  |  | — |  |  | (495 | ) |  | (660 | ) |  | (495 | ) |  | (660 | )
Benefits paid | (609 | ) |  | (597 | ) |  | 609 |  |  | 597 |  |  | — |  |  | — |
| (609 | ) |  | (597 | ) |  | 114 |  |  | (63 | ) |  | (495 | ) |  | (660 | )
Balance at December 31 | $ | 16,255 |  |  | $ | 17,603 |  |  | $ | (12,040 | ) |  | $ | (12,809 | ) |  | $ | 4,215 |  |  | $ | 4,794 |
19. | Employee future benefits (cont'd):
| Defined benefit obligation |  |  | Fair value of plan assets |  |  | Net defined benefit liability |
Other post-retirement benefit plan | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Balance at January 1 | $ | 120 |  |  | $ | 196 |  |  | $ | — |  |  | $ | — |  |  | $ | 120 |  |  | $ | 196 |
Included in profit or loss |  |  |  |  |  |  |  |  |  |  |
Interest cost (income) | 3 |  |  | 4 |  |  | — |  |  | — |  |  | 3 |  |  | 4 |
| 3 |  |  | 4 |  |  | — |  |  | — |  |  | 3 |  |  | 4 |
Included in other comprehensive income |  |  |  |  |  |  |  |  |  |  |
Remeasurements loss (gain): |  |  |  |  |  |  |  |  |  |  |
Actuarial loss (gain) arising from: |  |  |  |  |  |  |  |  |  |  |
Demographic assumptions | — |  |  | (1 | ) |  | — |  |  | — |  |  | — |  |  | (1 | )
Financial assumptions | (5 | ) |  | 3 |  |  | — |  |  | — |  |  | (5 | ) |  | 3 |
Experience adjustment | 7 |  |  | (53 | ) |  | — |  |  | — |  |  | 7 |  |  | (53 | )
| 2 |  |  | (51 | ) |  | — |  |  | — |  |  | $ | 2 |  |  | $ | (51 | )
Other |  |  |  |  |  |  |  |  |  |  |
Contributions paid by the employer | — |  |  | — |  |  | (41 | ) |  | (29 | ) |  | (41 | ) |  | (29 | )
Benefits paid | (41 | ) |  | (29 | ) |  | 41 |  |  | 29 |  |  | — |  |  | — |
| (41 | ) |  | (29 | ) |  | — |  |  | — |  |  | (41 | ) |  | (29 | )
Balance at December 31 | $ | 84 |  |  | $ | 120 |  |  | $ | — |  |  | $ | — |  |  | $ | 84 |  |  | $ | 120 |
| December 31, 2018 |  |  | December 31, 2017 |
Net defined benefit pension plan liability | $ | 4,215 |  |  | $ | 4,794 |
Net other post-retirement benefit plan liability | 84 |  |  | 120 |
Employee future benefits | $ | 4,299 |  |  | $ | 4,914 |
Disclosure of comprehensive income by plan type |
Included in other comprehensive income (loss) | December 31, 2018 |  |  | December 31, 2017 |
Defined benefit pension plan actuarial gain (loss) | $ | 307 |  |  | $ | (257 | )
Other post-retirement benefit plan actuarial gain (loss) | (2 | ) |  | 51 |
| $ | 305 |  |  | $ | (206 | )
Disclosure of fair value of plan assets | Pension plan assets comprise:
| 2018 |  |  | 2017 |
Cash and cash equivalents | 3 | % |  | 3 | %
Equity securities | 59 | % |  | 60 | %
Debt securities | 38 | % |  | 37 | %
Total | 100 | % |  | 100 | %
Disclosure of defined benefit plans | The significant actuarial assumptions adopted in measuring the fair value of benefit obligations at December 31 were as follows:
|  |  | 2018 |  |  |  |  | 2017 |
| Pension plan |  |  | Other benefit plan |  |  | Pension plan |  |  | Other benefit plan |
Discount rate | 4.16 | % |  | 3.96 | % |  | 3.60 | % |  | 3.27 | %
Rate of compensation increase | n/a |  |  | n/a |  |  | n/a |  |  | n/a |
The significant actuarial assumptions adopted in determining net expense for the years ended December 31 were as follows:
|  |  | 2018 |  |  |  |  | 2017 |
| Pension plan |  |  | Other benefit plan |  |  | Pension plan |  |  | Other benefit plan |
Discount rate | 3.60 | % |  | 3.96 | % |  | 4.13 | % |  | 3.27 | %
Rate of compensation increase | n/a |  |  | n/a |  |  | n/a |  |  | n/a |
Disclosure of sensitivity analysis for actuarial assumptions | The assumed health care cost trend rates applicable to the other post-retirement benefit plan at December 31 were as follows:
| 2018 |  | 2017 |
Initial medical/dental health care cost trend rate | n/a |  | 8.0 | %
Cost trend rate declines to medical and dental | n/a |  | 5.0 | %
Year that the medical rate reaches the rate it is assumed to remain at | 2023 |  | 2022 |
Year that the dental rate reaches the rate it is assumed to remain at | 2018 |  | 2017 |

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