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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, 2019 | Dec. 31, 2018
Plan assets |  |
Disclosure of fair value of plan assets [line items] |  |
Beginning Balance | $ 48,059 | $ 56,304
Interest income on plan assets | 1,881 | 1,799
Actuarial gain (loss) | 1,517 | (2,500)
Benefit payments | (2,341) | (3,227)
Exchange gain (loss) | 1,882 | (4,317)
Ending Balance | 26,568 | 48,059
Present value of defined benefit obligation |  |
Disclosure of fair value of plan assets [line items] |  |
Beginning Balance | 53,314 | 59,984
Interest income on plan assets | 2,116 | 2,004
Actuarial gain (loss) | 7,878 | (1,303)
Assets distributed on settlement | (24,430) | 0
Benefit payments | (3,765) | (3,895)
Exchange gain (loss) | (985) | 6,826
Ending Balance | 38,548 | 53,314
Employee benefit plans | Plan assets |  |
Disclosure of fair value of plan assets [line items] |  |
Beginning Balance | 1,864 | 2,429
Interest income on plan assets | 72 | 73
Actuarial gain (loss) | 82 | (64)
Benefit payments | (152) | (399)
Exchange gain (loss) | 92 | (175)
Ending Balance | 1,958 | 1,864
Employee benefit plans | Present value of defined benefit obligation |  |
Disclosure of fair value of plan assets [line items] |  |
Beginning Balance | 16,239 | 16,028
Interest income on plan assets | 669 | 601
Actuarial gain (loss) | 3,097 | 1,209
Assets distributed on settlement | 0 | 0
Benefit payments | (1,576) | (1,066)
Exchange gain (loss) | 428 | 3,468
Ending Balance | 20,182 | 16,239
SERP | Plan assets |  |
Disclosure of fair value of plan assets [line items] |  |
Beginning Balance | 46,195 | 53,875
Interest income on plan assets | 1,809 | 1,726
Actuarial gain (loss) | 1,435 | (2,436)
Benefit payments | (2,189) | (2,828)
Exchange gain (loss) | 1,790 | (4,142)
Ending Balance | 24,610 | 46,195
SERP | Present value of defined benefit obligation |  |
Disclosure of fair value of plan assets [line items] |  |
Beginning Balance | 37,075 | 43,956
Interest income on plan assets | 1,447 | 1,403
Actuarial gain (loss) | 4,781 | (2,512)
Assets distributed on settlement | (24,430) | 0
Benefit payments | (2,189) | (2,829)
Exchange gain (loss) | (1,413) | 3,358
Ending Balance | $ 18,366 | $ 37,075

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- Definition Assets distributed on settlement, 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 2018-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_e&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_b&doctype=Standard -URIDate 2018-03-16 + 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 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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- 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 2018-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_g&doctype=Standard -URIDate 2018-03-16 + Details
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