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Defined benefit plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of defined benefit plans [abstract] |
Summary of Defined Benefit Plans |
| December 31, 2018 |  |  | December 31, 2017 |
Income statement charge for: |  |  |
Pension plan | $ | 3,463 |  |  | $ | 2,841 |
Supplemental Pension Plan | 92 |  |  | 610 |
| $ | 3,555 |  |  | $ | 3,451 |
Actuarial losses recognised in the statement of other |  |  |
comprehensive income in the period (before tax) | $ | (1,197 | ) |  | $ | (3,121 | )
Cumulative actuarial losses recognised in the statement of |  |  |
other comprehensive income (before tax) | $ | (19,838 | ) |  | $ | (18,641 | )
Summary of Amounts Recognised in the Balance Sheet for All Pension Plans | The amounts recognised in the consolidated statement of financial position for all pension plans are determined as follows:
| December 31, 2018 |  | December 31, 2017
| Pension Plan |  | SERP |  | Total |  |  | Pension Plan |  | SERP |  | Total |
Present value of obligations | $ | (16,239 | ) | $ | (37,075 | ) | $ | (53,314 | ) |  | $ | (16,028 | ) | $ | (43,956 | ) | $ | (59,984 | )
Fair value of plan assets | 1,864 |  | 46,195 |  | 48,059 |  |  | 2,429 |  | 53,875 |  | 56,304 |
Asset (liability) on balance sheet | $ | (14,375 | ) | $ | 9,120 |  | $ | (5,255 | ) |  | $ | (13,599 | ) | $ | 9,919 |  | $ | (3,680 | )
Summary of Movement in the Defined Benefit Obligation Over the Year | The movement in the present value of the defined benefit obligation over the years is as follows:
| 2018 |  | 2017
| Pension Plan |  | SERP |  | Total |  |  | Pension Plan |  | SERP |  | Total |
Balance at January 1, | $ | (16,028 | ) | $ | (43,956 | ) | $ | (59,984 | ) |  | $ | (12,936 | ) | $ | (37,686 | ) | $ | (50,622 | )
Current service cost | (2,935 | ) | (269 | ) | (3,204 | ) |  | (2,102 | ) | (877 | ) | (2,979 | )
Past service cost | — |  | (146 | ) | (146 | ) |  | (206 | ) | (208 | ) | (414 | )
Interest cost | (601 | ) | (1,403 | ) | (2,004 | ) |  | (620 | ) | (1,508 | ) | (2,128 | )
Actuarial gain (loss) | (1,209 | ) | 2,512 |  | 1,303 |  |  | (292 | ) | (2,390 | ) | (2,682 | )
Benefit payments | 1,066 |  | 2,829 |  | 3,895 |  |  | 1,060 |  | 1,485 |  | 2,545 |
Exchange gain (loss) | 3,468 |  | 3,358 |  | 6,826 |  |  | (932 | ) | (2,772 | ) | (3,704 | )
Balance at December 31, | $ | (16,239 | ) | $ | (37,075 | ) | $ | (53,314 | ) |  | $ | (16,028 | ) | $ | (43,956 | ) | $ | (59,984 | )
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:
| 2018 |  | 2017
| Pension Plan |  | SERP |  | Total |  |  | Pension Plan |  | SERP |  | Total |
At January 1, | $ | 2,429 |  | $ | 53,875 |  | $ | 56,304 |  |  | $ | 2,054 |  | $ | 49,306 |  | $ | 51,360 |
Interest income on plan assets | 73 |  | 1,726 |  | 1,799 |  |  | 86 |  | 1,983 |  | 2,069 |
Actuarial gain (loss) | (64 | ) | (2,436 | ) | (2,500 | ) |  | (55 | ) | (384 | ) | (439 | )
Contributions by employer | — |  | — |  | — |  |  | 219 |  | 1,196 |  | 1,415 |
Benefit payments | (399 | ) | (2,828 | ) | (3,227 | ) |  | (57 | ) | (1,485 | ) | (1,542 | )
Exchange gain (loss) | (175 | ) | (4,142 | ) | (4,317 | ) |  | 182 |  | 3,259 |  | 3,441 |
At December 31, | $ | 1,864 |  | $ | 46,195 |  | $ | 48,059 |  |  | $ | 2,429 |  | $ | 53,875 |  | $ | 56,304 |
Summary of Amounts Recognised in the Income Statement | The amounts recognised in the consolidated statement of operations are as follows:
| 2018 |  | 2017
| Pension Plan |  | SERP |  | Total |  |  | Pension Plan |  | SERP |  | Total |
Current service cost | $ | 2,935 |  | $ | 269 |  | $ | 3,204 |  |  | $ | 2,102 |  | $ | 877 |  | $ | 2,979 |
Interest cost | 601 |  | 1,404 |  | 2,005 |  |  | 620 |  | 1,508 |  | 2,128 |
Past Service Cost | — |  | 146 |  | 146 |  |  | 206 |  | 208 |  | 414 |
Expected return on plan assets | (73 | ) | (1,727 | ) | (1,800 | ) |  | (87 | ) | (1,983 | ) | (2,070 | )
Defined benefit plans expense | $ | 3,463 |  | $ | 92 |  | $ | 3,555 |  |  | $ | 2,841 |  | $ | 610 |  | $ | 3,451 |
Summary of Principal Actuarial Assumptions | The principal actuarial assumptions used were as follows:
| 2018 |  | 2017
| Pension Plan |  | SERP |  | Pension Plan |  | SERP
| Greece |  | Turkey |  | Canada |  | Canada |  | Greece |  | Turkey |  | Canada |  | Canada
| % |  | % |  | % |  | % |  | % |  | % |  | % |  | %
Expected return on plan assets | — |  | — |  | 3.4 |  | 3.4 |  | — |  | — |  | 3.9 |  | 3.9
Discount rate - beginning of year | 1.7 |  | 11.0 |  | 3.4 |  | 3.4 |  | 1.6 |  | 10.5 |  | 3.9 |  | 3.9
Discount rate - end of year | 1.7 |  | 15.0 |  | 3.9 |  | 3.9 |  | 1.7 |  | 11.0 |  | 3.4 |  | 3.4
Rate of salary escalation | 2.8 |  | 9.0 |  | 2.0 |  | 2.0 |  | 2.8 |  | 6.5 |  | 2.0 |  | 2.0
Average remaining service period of active employees expected to receive benefits | — |  | — |  | 1.6 years |  | 1.6 years |  | — |  | — |  | 8.2 years |  | 8.2 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, 2018 |  | December 31, 2017
| Pension Plan | SERP |  | Pension Plan | SERP
Investment funds |  |  |  |  |
Money market | 2 | % | 1 | % |  | — |  | 6 | %
Canadian fixed income | 98 | % | 6 | % |  | 100 | % | 2 | %
Canadian equities | — |  | 22 | % |  | — |  | 20 | %
US equities | — |  | 10 | % |  | — |  | 19 | %
International equities | — |  | 12 | % |  | — |  | 7 | %
Other (1) | — |  | 49 | % |  | — |  | 46 | %
Total | 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 $2,189
| Decrease by 0.5% | Increase by $2,401
Salary escalation rate | Increase by 0.5% | Increase by $nil
| Decrease by 0.5% | Decrease by $nil

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- Definition The disclosure of defined benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 138 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_138&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The disclosure of the fair value of defined benefit plan assets. [Refer: Plan assets [member]; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 142 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_142&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The disclosure of a net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_140_a&doctype=Standard -URIDate 2018-03-16 + Details
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