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Employee benefit plans - Summary of Defined Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of defined benefit plans [line items] |  |
Defined benefit pension plan expense | $ 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)
Employee Benefit Plan |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit pension plan expense | 2,778 | 3,463
Supplemental Pension Plan |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit pension plan expense | $ (61) | $ 92

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- Definition Cumulative amount of actuarial losses (gains) recognized in comprehensive income. + 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 amount of other comprehensive income, before tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income, before tax; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_91_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_5&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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