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Employee benefit plans - Summary of Amounts Recognised in the Balance Sheet for All Pension Plans (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of defined benefit plans [line items] |  |
Present value of obligations | $ (38,548) | $ (53,314)
Fair value of plan assets | 26,568 | 48,059
Asset (liability) on statement of financial position | (11,980) | (5,255)
Employee benefit plans |  |
Disclosure of defined benefit plans [line items] |  |
Present value of obligations | (20,182) | (16,239)
Fair value of plan assets | 1,958 | 1,864
Asset (liability) on statement of financial position | (18,224) | (14,375)
Supplemental Pension Plan |  |
Disclosure of defined benefit plans [line items] |  |
Present value of obligations | (18,366) | (37,075)
Fair value of plan assets | 24,610 | 46,195
Asset (liability) on statement of financial position | $ 6,244 | $ 9,120

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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_a&doctype=Standard -URIDate 2018-03-16 + Details
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Balance Type: | credit
Period Type: | instant

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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 fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |