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Employee benefit plans - Summary of amounts recognised in the income statement (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | $ 2,446 | $ 2,353
Interest cost | 1,186 | 2,116
Past service cost | 0 | 97
Loss on settlement | (5) | 32
Expected return on plan assets | (778) | (1,881)
Employee benefit plans expense (recovery) | 2,849 | 2,717
Employee benefit plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 2,446 | 2,181
Interest cost | 639 | 669
Past service cost | 0 | 0
Loss on settlement | (5) | 0
Expected return on plan assets | (44) | (72)
Employee benefit plans expense (recovery) | 3,036 | 2,778
SERP |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 0 | 172
Interest cost | 547 | 1,447
Past service cost | 0 | 97
Loss on settlement | 0 | 32
Expected return on plan assets | (734) | (1,809)
Employee benefit plans expense (recovery) | $ (187) | $ (61)

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- Definition Current Service Costs Recognised in Profit or Loss + References No definition available. + Details
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- Definition Expected return on plan assets net defined benefit liability asset recognised in profit or loss. + References No definition available. + Details
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- Definition Losses arising from settlements recognised in profit or loss + References No definition available. + Details
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- Definition Net interest expense (income) defined benefit liability asset recognized in profit or loss. + References No definition available. + Details
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- Definition Past Service Costs Recognised in Profit or Loss + References No definition available. + 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 2020-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_5&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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