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Property, plant and equipment - Additional information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Capitalized interest |  |  | $ 0 | $ 3,848,000
Increase (decrease) in proven and probable reserves (as a percent) | (23.00%) |  |  |
Write-down of assets |  |  | 38,660,000 | 6,298,000
Cost |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Write-down of assets |  |  | $ 40,030,000 | 1,995,000
Reversal (impairment) of property, plant and equipment |  |  |  | $ (3,578,000)
Individual assets or cash-generating units | Turkey |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Reversal (impairment) of property, plant and equipment |  | $ 100,492,000 |  |
Reversal (impairment) of property, plant and equipment, net of deferred tax |  | 80,143,000 |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  | 15,269,000 |  |
Impairment loss recognised in profit or loss, property, plant and equipment, net of deferred tax |  | $ 11,910,000 |  |

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- Definition Impairment Loss Recognised In Profit Or Loss, Net Of Taxes, Property, Plant And Equipment + References No definition available. + Details
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- Definition Increase (Decrease) in Proven and Probable Reserves, Percent + References No definition available. + Details
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- Definition Reversal (Impairment) of Property, Plant and Equipment, Net of Deferred Tax + References No definition available. + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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