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Employee future benefits - Future Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset), beginning balance | $ 4,914 |
Included in profit or loss |  |
Employee future benefit plan expense | (226) | $ (230)
Other |  |
Net defined benefit liability (asset), ending balance | 4,299 | 4,914
Defined benefit pension plan |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset), beginning balance | 4,794 | 4,971
Included in profit or loss |  |
Current service cost | 57 | 32
Interest cost (income) | 166 | 194
Benefits payable | 0 | 0
Employee future benefit plan expense | 223 | 226
Actuarial loss (gain) arising from: |  |
Demographic assumptions | (49) | (99)
Financial assumptions | (1,331) | 1,300
Experience adjustment | (2) | 111
Return on plan assets excluding interest income | 1,075 | (1,055)
Plan expenses | 0 | 0
Remeasurement (gains) losses | (307) | 257
Other |  |
Contributions paid by the employer | (495) | (660)
Payments in respect of settlements, net defined benefit liability (asset) | 0 | 0
Other total | (495) | (660)
Net defined benefit liability (asset), ending balance | 4,215 | 4,794
Defined benefit pension plan | Defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset), beginning balance | 17,603 | 16,253
Included in profit or loss |  |
Current service cost | 57 | 32
Interest cost (income) | 621 | 658
Benefits payable | 0 | 0
Employee future benefit plan expense | 678 | 690
Actuarial loss (gain) arising from: |  |
Demographic assumptions | (49) | (99)
Financial assumptions | (1,331) | 1,300
Experience adjustment | (2) | 111
Return on plan assets excluding interest income | 0 | 0
Plan expenses | (35) | (55)
Remeasurement (gains) losses | (1,417) | 1,257
Other |  |
Contributions paid by the employer | 0 | 0
Payments in respect of settlements, net defined benefit liability (asset) | (609) | (597)
Other total | (609) | (597)
Net defined benefit liability (asset), ending balance | 16,255 | 17,603
Defined benefit pension plan | Fair value of plan assets |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset), beginning balance | (12,809) | (11,282)
Included in profit or loss |  |
Current service cost | 0 | 0
Interest cost (income) | (455) | (464)
Benefits payable | 0 | 0
Employee future benefit plan expense | (455) | (464)
Actuarial loss (gain) arising from: |  |
Demographic assumptions | 0 | 0
Financial assumptions | 0 | 0
Experience adjustment | 0 | 0
Return on plan assets excluding interest income | 1,075 | (1,055)
Plan expenses | 35 | 55
Remeasurement (gains) losses | 1,110 | (1,000)
Other |  |
Contributions paid by the employer | (495) | (660)
Payments in respect of settlements, net defined benefit liability (asset) | 609 | 597
Other total | 114 | (63)
Net defined benefit liability (asset), ending balance | (12,040) | (12,809)
Other post-retirement benefit plan |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset), beginning balance | 120 | 196
Included in profit or loss |  |
Interest cost (income) | 3 | 4
Employee future benefit plan expense | 3 | 4
Actuarial loss (gain) arising from: |  |
Demographic assumptions | 0 | (1)
Financial assumptions | (5) | 3
Experience adjustment | 7 | (53)
Remeasurement (gains) losses | 2 | (51)
Other |  |
Contributions paid by the employer | (41) | (29)
Payments in respect of settlements, net defined benefit liability (asset) | 0 | 0
Other total | (41) | (29)
Net defined benefit liability (asset), ending balance | 84 | 120
Other post-retirement benefit plan | Defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset), beginning balance | 120 | 196
Included in profit or loss |  |
Interest cost (income) | 3 | 4
Employee future benefit plan expense | 3 | 4
Actuarial loss (gain) arising from: |  |
Demographic assumptions | 0 | (1)
Financial assumptions | (5) | 3
Experience adjustment | 7 | (53)
Remeasurement (gains) losses | 2 | (51)
Other |  |
Contributions paid by the employer | 0 | 0
Payments in respect of settlements, net defined benefit liability (asset) | (41) | (29)
Other total | (41) | (29)
Net defined benefit liability (asset), ending balance | 84 | 120
Other post-retirement benefit plan | Fair value of plan assets |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset), beginning balance | 0 | 0
Included in profit or loss |  |
Interest cost (income) | 0 | 0
Employee future benefit plan expense | 0 | 0
Actuarial loss (gain) arising from: |  |
Demographic assumptions | 0 | 0
Financial assumptions | 0 | 0
Experience adjustment | 0 | 0
Remeasurement (gains) losses | 0 | 0
Other |  |
Contributions paid by the employer | (41) | (29)
Payments in respect of settlements, net defined benefit liability (asset) | 41 | 29
Other total | 0 | 0
Net defined benefit liability (asset), ending balance | $ 0 | $ 0

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&doctype=Standard -URIDate 2017-03-09 + Details
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