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Provisions and other long-term liabilities (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Feb. 29, 2020 GBP (£)
Disclosure of other provisions [line items] |  |  |
Other provisions at beginning of period | $ 82,370,000 | $ 62,062,000 |
Addition to provision / changes in estimates | (638,000) | (166,000) |
Acquisitions |  | 16,519,000 |
Exchange difference | (1,975,000) | 2,255,000 |
Foreign currency translation | (653,000) | (2,057,000) |
Amortization | (223,000) | (387,000) |
Unwinding of discount | 3,626,000 | 4,647,000 |
Amounts used during the year | (461,000) | (451,000) |
Liabilities associated with assets held for sale | (19,198,000) | (52,000) |
Other provisions at end of period | 62,848,000 | 82,370,000 |
Amount of Assets Under Freeze | 6,022,000 |  | £ 4,465,600
Provision for decommissioning, restoration and rehabilitation costs [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Other provisions at beginning of period | 64,040,000 | 56,113,000 |
Addition to provision / changes in estimates | (651,000) | (1,812,000) |
Acquisitions |  | 5,629,000 |
Exchange difference | (668,000) | 2,215,000 |
Foreign currency translation | (651,000) | (2,057,000) |
Amortization |  | 0 |
Unwinding of discount | 3,140,000 | 4,276,000 |
Amounts used during the year | (170,000) | (272,000) |
Liabilities associated with assets held for sale | (19,198,000) | (52,000) |
Other provisions at end of period | 45,842,000 | 64,040,000 |
Provision For Deferred Income [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Other provisions at beginning of period | 3,828,000 | 2,267,000 |
Addition to provision / changes in estimates | (46,000) | (258,000) |
Acquisitions |  | 2,339,000 |
Exchange difference | (228,000) | (93,000) |
Amortization | (223,000) | (387,000) |
Unwinding of discount | 0 |  |
Amounts used during the year |  | (40,000) |
Other provisions at end of period | 3,331,000 | 3,828,000 |
Miscellaneous other provisions [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Other provisions at beginning of period | 14,502,000 | 3,682,000 |
Addition to provision / changes in estimates | 59,000 | 1,904,000 |
Acquisitions |  | 8,551,000 |
Exchange difference | (1,079,000) | 133,000 |
Foreign currency translation | (2,000) |  |
Amortization |  | 0 |
Unwinding of discount | 486,000 | 371,000 |
Amounts used during the year | (291,000) | (139,000) |
Other provisions at end of period | $ 13,675,000 | $ 14,502,000 |

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- Definition The decrease in other provisions through adjustments arising from the passage of time. + References No definition available. + Details
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- Definition The increase in other provisions resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2021-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2021-en-r&anchor=para_84&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The decrease in other provisions resulting from the transfer of those provisions to liabilities included in disposal groups classified as held for sale. [Refer: Other provisions; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2021-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2021-en-r&anchor=para_84&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in other provisions resulting from a change in discount rate. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2021-01-01 -Paragraph 84 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2021-en-r&anchor=para_84_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2021-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2021-en-r&anchor=para_84&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of provisions other than provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2021-01-01 -Paragraph 84 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2021-en-r&anchor=para_84_a&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78_d&doctype=Standard -URIDate 2021-03-24 + Details
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