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Employee benefit plans - Summary of movement in the fair value of plan assets of the year (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Plan assets |  |
Disclosure of fair value of plan assets [line items] |  |
Beginning Balance | $ 26,568 | $ 48,059
Interest income on plan assets | 778 | 1,881
Actuarial gain (loss) | (1,324) | 1,517
Contributions by employer | 1,281 | 0
Benefit payments | (318) | (2,341)
Exchange gain (loss) | (429) | 1,882
Ending Balance | 8,470 | 26,568
Present value of defined benefit obligation |  |
Disclosure of fair value of plan assets [line items] |  |
Beginning Balance | 38,548 | 53,314
Interest income on plan assets | 1,186 | 2,116
Actuarial gain (loss) | 2,116 | 7,878
Assets distributed on settlement | (18,086) | (24,430)
Benefit payments | 1,352 | 3,765
Exchange gain (loss) | 158 | (985)
Ending Balance | 24,695 | 38,548
Employee benefit plans | Plan assets |  |
Disclosure of fair value of plan assets [line items] |  |
Beginning Balance | 1,958 | 1,864
Interest income on plan assets | 42 | 72
Actuarial gain (loss) | 59 | 82
Contributions by employer | 1,281 | 0
Benefit payments | (138) | (152)
Exchange gain (loss) | (61) | 92
Ending Balance | 0 | 1,958
Employee benefit plans | Present value of defined benefit obligation |  |
Disclosure of fair value of plan assets [line items] |  |
Beginning Balance | 20,182 | 16,239
Interest income on plan assets | 639 | 669
Actuarial gain (loss) | 2,664 | 3,097
Assets distributed on settlement | (3,141) | 0
Benefit payments | 1,172 | 1,576
Exchange gain (loss) | (361) | 428
Ending Balance | 21,974 | 20,182
SERP | Plan assets |  |
Disclosure of fair value of plan assets [line items] |  |
Beginning Balance | 24,610 | 46,195
Interest income on plan assets | 736 | 1,809
Actuarial gain (loss) | (1,383) | 1,435
Contributions by employer | 0 | 0
Benefit payments | (180) | (2,189)
Exchange gain (loss) | (368) | 1,790
Ending Balance | 8,470 | 24,610
SERP | Present value of defined benefit obligation |  |
Disclosure of fair value of plan assets [line items] |  |
Beginning Balance | 18,366 | 37,075
Interest income on plan assets | 547 | 1,447
Actuarial gain (loss) | (548) | 4,781
Assets distributed on settlement | (14,945) | (24,430)
Benefit payments | 180 | 2,189
Exchange gain (loss) | 519 | (1,413)
Ending Balance | $ 2,721 | $ 18,366

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- Definition Assets To Be Distributed on Settlement for Employee Benefit Plans + References No definition available. + Details
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- Definition Yearly Contributions to Plan by Employer, Net Defined Benefit Liability (Asset) + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that 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 2020-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_b&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_140_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan in respect of settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_g&doctype=Standard -URIDate 2020-01-01 + Details
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