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Employee benefit plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of defined benefit plans [abstract] |
Summary of Defined Benefit Plans |
| December 31, 2019 |  |  | December 31, 2018 |
Employee benefit plan expense: |  |  |
Employee Benefit Plan | $ | 2,778 |  |  | $ | 3,463 |
Supplemental Pension Plan | (61 | ) |  | 92 |
| $ | 2,717 |  |  | $ | 3,555 |
Actuarial losses recognized in the statement of other comprehensive income (loss) in the period, before tax | $ | (6,361 | ) |  | $ | (1,197 | )
Cumulative actuarial losses recognized in the statement of other comprehensive income (loss), before tax | $ | (26,199 | ) |  | $ | (19,838 | )
Summary of Amounts Recognised in the Statement of Financial Position for All Pension Plans | The amounts recognized in the consolidated statement of financial position for all pension plans are determined as follows:
| December 31, 2019 |  | December 31, 2018
| Employee benefit plans |  | SERP |  | Total |  |  | Employee benefit plans |  | SERP |  | Total |
Present value of obligations | $ | (20,182 | ) | $ | (18,366 | ) | $ | (38,548 | ) |  | $ | (16,239 | ) | $ | (37,075 | ) | $ | (53,314 | )
Fair value of plan assets | 1,958 |  | 24,610 |  | 26,568 |  |  | 1,864 |  | 46,195 |  | 48,059 |
Asset (liability) on statement of financial position | $ | (18,224 | ) | $ | 6,244 |  | $ | (11,980 | ) |  | $ | (14,375 | ) | $ | 9,120 |  | $ | (5,255 | )
Summary of Movement in the Defined Benefit Obligation Over the Year | The movement in the present value of the employee benefit obligations over the years is as follows:
| 2019 |  | 2018
| Employee benefit plans |  | SERP |  | Total |  |  | Employee benefit plans |  | SERP |  | Total |
Balance at January 1, | $ | (16,239 | ) | $ | (37,075 | ) | $ | (53,314 | ) |  | $ | (16,028 | ) | $ | (43,956 | ) | $ | (59,984 | )
Current service cost | (2,181 | ) | (172 | ) | (2,353 | ) |  | (2,935 | ) | (269 | ) | (3,204 | )
Past service cost | — |  | (97 | ) | (97 | ) |  | — |  | (146 | ) | (146 | )
Interest cost | (669 | ) | (1,447 | ) | (2,116 | ) |  | (601 | ) | (1,403 | ) | (2,004 | )
Actuarial gain (loss) | (3,097 | ) | (4,781 | ) | (7,878 | ) |  | (1,209 | ) | 2,512 |  | 1,303 |
Assets distributed on settlement | — |  | 24,430 |  | 24,430 |  |  | — |  | — |  | — |
Benefit payments | 1,576 |  | 2,189 |  | 3,765 |  |  | 1,066 |  | 2,829 |  | 3,895 |
Exchange gain (loss) | 428 |  | (1,413 | ) | (985 | ) |  | 3,468 |  | 3,358 |  | 6,826 |
Balance at December 31, | $ | (20,182 | ) | $ | (18,366 | ) | $ | (38,548 | ) |  | $ | (16,239 | ) | $ | (37,075 | ) | $ | (53,314 | )
Summary of Movement in the Fair Value of Plan Assets of the Year | The movement in the fair value of plan assets over the years is as follows:
| 2019 |  | 2018
| Employee benefit plans |  | SERP |  | Total |  |  | Employee benefit plans |  | SERP |  | Total |
At January 1, | $ | 1,864 |  | $ | 46,195 |  | $ | 48,059 |  |  | $ | 2,429 |  | $ | 53,875 |  | $ | 56,304 |
Interest income on plan assets | 72 |  | 1,809 |  | 1,881 |  |  | 73 |  | 1,726 |  | 1,799 |
Actuarial gain (loss) | 82 |  | 1,435 |  | 1,517 |  |  | (64 | ) | (2,436 | ) | (2,500 | )
Assets distributed on settlement | — |  | (24,430 | ) | (24,430 | ) |  | — |  | — |  | — |
Benefit payments | (152 | ) | (2,189 | ) | (2,341 | ) |  | (399 | ) | (2,828 | ) | (3,227 | )
Exchange gain (loss) | 92 |  | 1,790 |  | 1,882 |  |  | (175 | ) | (4,142 | ) | (4,317 | )
At December 31, | $ | 1,958 |  | $ | 24,610 |  | $ | 26,568 |  |  | $ | 1,864 |  | $ | 46,195 |  | $ | 48,059 |
Summary of Amounts Recognised in the Statements of Operations | The amounts recognized in the consolidated statements of operations are as follows:
| 2019 |  | 2018
| Employee benefit plans |  | SERP |  | Total |  |  | Employee benefit plans |  | SERP |  | Total |
Current service cost | $ | 2,181 |  | $ | 172 |  | $ | 2,353 |  |  | $ | 2,935 |  | $ | 269 |  | $ | 3,204 |
Interest cost | 669 |  | 1,447 |  | 2,116 |  |  | 601 |  | 1,404 |  | 2,005 |
Past service cost | — |  | 97 |  | 97 |  |  | — |  | 146 |  | 146 |
Loss on settlement | — |  | 32 |  | 32 |  |  | — |  | — |  | — |
Expected return on plan assets | (72 | ) | (1,809 | ) | (1,881 | ) |  | (73 | ) | (1,727 | ) | (1,800 | )
Employee benefit plans expense (recovery) | $ | 2,778 |  | $ | (61 | ) | $ | 2,717 |  |  | $ | 3,463 |  | $ | 92 |  | $ | 3,555 |
Summary of Principal Actuarial Assumptions | The principal actuarial assumptions used were as follows:
| 2019 |  | 2018
| Employee benefit plans |  | SERP |  | Employee benefit plans |  | SERP
| Greece |  | Turkey |  | Canada |  | Canada |  | Greece |  | Turkey |  | Canada |  | Canada
| % |  | % |  | % |  | % |  | % |  | % |  | % |  | %
Expected return on plan assets | — |  | — |  | 3.9 |  | 3.9 |  | — |  | — |  | 3.4 |  | 3.4
Discount rate - beginning of year | 1.7 |  | 15.0 |  | 3.9 |  | 3.9 |  | 1.7 |  | 11.0 |  | 3.4 |  | 3.4
Discount rate - end of year | 0.9 |  | 13.0 |  | 3.1 |  | 3.1 |  | 1.7 |  | 15.0 |  | 3.9 |  | 3.9
Rate of salary escalation | 2.7 |  | 8.2 |  | 2.0 |  | 2.0 |  | 2.8 |  | 9.0 |  | 2.0 |  | 2.0
Average remaining service period of active employees expected to receive benefits | — |  | — |  | 0.6 years |  | 0.6 years |  | — |  | — |  | 1.6 years |  | 1.6 years
Summary of Defined Benefit Plans' Weighted Average Asset Allocation Percentages by Asset Category | The following table summarizes the defined benefit plans’ weighted average asset allocation percentages by asset category:
| December 31, 2019 |  | December 31, 2018
| Employee benefit plans |  | SERP |  |  | Employee benefit plans |  | SERP |
Investment funds |  |  |  |  |
Money market | 2 | % | 7 | % |  | 2 | % | 1 | %
Canadian fixed income | 98 | % | — | % |  | 98 | % | 6 | %
Canadian equities | — |  | — | % |  | — |  | 22 | %
US equities | — |  | — | % |  | — |  | 10 | %
International equities | — |  | — | % |  | — |  | 12 | %
Other (1) | — |  | 93 | % |  | — |  | 49 | %
| 100 | % | 100 | % |  | 100 | % | 100 | %
(1) | Assets held by the Canada Revenue Agency in the refundable tax account
Summary of Sensitivity of the Overall Pension Obligation to Changes in the Weighted Principal Assumptions | The sensitivity of the overall pension obligation to changes in the weighted principal assumptions is:
| Change in assumption | Impact on overall obligation
Discount rate | Increase by 0.5% | Decrease by $1,270
| Decrease by 0.5% | Increase by $1,422
Salary escalation rate | Increase by 0.5% | Increase by $1,199
| Decrease by 0.5% | Decrease by $1,080

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