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Property, plant and equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | $ 614,665 | $ 567,788 |
Depreciation | (81,139) | (108,971) | $ (102,884)
Reclassification |  |  | 2,813
Property, plant and equipment at year-end | 614,047 | 614,665 | 567,788
Oil and gas properties [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | 420,172 | 363,131 |
Depreciation | (66,011) | (89,344) | (83,276)
Reclassification |  |  | 26,302
Property, plant and equipment at year-end | 394,775 | 420,172 | 363,131
Furniture, equipment and vehicles [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | 3,722 | 4,400 |
Reclassification |  |  | 0
Property, plant and equipment at year-end | 2,044 | 3,722 | 4,400
Production facilities and machinery [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | 87,842 | 77,460 |
Reclassification |  |  | (23,489)
Property, plant and equipment at year-end | 84,560 | 87,842 | 77,460
Buildings and improvements |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | 5,467 | 5,174 |
Depreciation | (700) | (490) | (804)
Reclassification |  |  | 0
Property, plant and equipment at year-end | 4,994 | 5,467 | 5,174
Construction in Progress [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | 18,848 | 69,587 |
Reclassification |  |  | 0
Property, plant and equipment at year-end | 27,204 | 18,848 | 69,587
Exploration and evaluation assets [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | 78,614 | 48,036 |
Reclassification |  |  | 0
Property, plant and equipment at year-end | 100,470 | 78,614 | 48,036
Gross carrying amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | 1,297,057 | 1,152,386 | 1,039,495
Additions | 128,164 | 72,435 | 140,749
Currency translation differences | (3,637) | (16,136) | (4,560)
Disposals | 7,350 | 815 | 262
Write-off / Impairment loss | (16,596) | (186,516) | (25,849)
Transfers | 0 | 0 | 0
Acquisitions |  | 276,988 |
Assets held for sale | (80,481) | (1,285) |
Property, plant and equipment at year-end | 1,317,157 | 1,297,057 | 1,152,386
Gross carrying amount [member] | Oil and gas properties [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | 968,617 | 830,937 | 717,510
Additions |  |  | 14,696
Retirements, property, plant and equipment | 1,094 | 2,863 |
Currency translation differences | (3,284) | (14,399) | (3,022)
Disposals | 0 | 0 | 0
Write-off / Impairment loss | (1,575) | (77,667) | (7,559)
Transfers | 68,315 | 48,361 | 83,010
Acquisitions |  | 185,533 |
Assets held for sale | (73,047) | (1,285) |
Property, plant and equipment at year-end | 957,932 | 968,617 | 830,937
Gross carrying amount [member] | Furniture, equipment and vehicles [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | 20,707 | 19,549 | 17,748
Additions | 930 | 1,180 | 2,052
Currency translation differences | (43) | (194) | (414)
Disposals | 1,762 | 555 | 102
Write-off / Impairment loss | 0 | 0 | 0
Transfers | 58 | 174 | 265
Acquisitions |  | 553 |
Assets held for sale | (1,178) | 0 |
Property, plant and equipment at year-end | 18,712 | 20,707 | 19,549
Gross carrying amount [member] | Production facilities and machinery [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | 197,829 | 172,507 | 172,094
Additions | 0 | 0 | 381
Currency translation differences | (246) | (1,036) | (561)
Disposals | 900 | 0 | 101
Write-off / Impairment loss | (2,759) | (11,357) | 0
Transfers | 13,305 | 21,534 | 24,183
Acquisitions |  | 16,181 |
Assets held for sale | (6,052) | 0 |
Property, plant and equipment at year-end | 201,177 | 197,829 | 172,507
Gross carrying amount [member] | Buildings and improvements |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | 12,442 | 11,770 | 11,554
Additions | 0 | 422 | 159
Currency translation differences | (16) | (59) | (8)
Disposals | 978 | 227 | 0
Write-off / Impairment loss | 0 | 0 | 0
Transfers | 391 | 324 | 65
Acquisitions |  | 212 |
Assets held for sale | (177) | 0 |
Property, plant and equipment at year-end | 11,662 | 12,442 | 11,770
Gross carrying amount [member] | Construction in Progress [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | 18,848 | 69,587 | 60,597
Additions | 82,094 | 55,267 | 96,012
Currency translation differences | (18) | (47) | (106)
Disposals | 3,372 | 33 | 0
Write-off / Impairment loss | 0 | (44,840) | 0
Transfers | (70,321) | (62,285) | (86,916)
Acquisitions |  | 1,199 |
Assets held for sale | (27) | 0 |
Property, plant and equipment at year-end | 27,204 | 18,848 | 69,587
Gross carrying amount [member] | Exploration and evaluation assets [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | 78,614 | 48,036 | 59,992
Additions | 46,234 | 18,429 | 27,449
Currency translation differences | (30) | (401) | (449)
Disposals | 338 | 0 | 59
Write-off / Impairment loss | (12,262) | (52,652) | (18,290)
Transfers | (11,748) | (8,108) | (20,607)
Acquisitions |  | 73,310 |
Assets held for sale | 0 | 0 |
Property, plant and equipment at year-end | 100,470 | 78,614 | 48,036
Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | (682,392) | (584,598) | (482,325)
Currency translation differences | 2,518 | 10,646 | 3,305
Depreciation | (81,139) | (108,971) | (102,884)
Disposals | (3,063) | (398) | (119)
Assets held for sale | 54,840 | 133 |
Reclassification |  |  | (2,813)
Property, plant and equipment at year-end | (703,110) | (682,392) | (584,598)
Accumulated depreciation, amortisation and impairment [member] | Oil and gas properties [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | (548,445) | (467,806) | (359,358)
Currency translation differences | 2,219 | 8,572 | 2,492
Depreciation | (66,011) | (89,344) | (83,276)
Disposals | 0 | 0 | 0
Assets held for sale | 49,080 | 133 |
Reclassification |  |  | (27,664)
Property, plant and equipment at year-end | (563,157) | (548,445) | (467,806)
Accumulated depreciation, amortisation and impairment [member] | Furniture, equipment and vehicles [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | (16,985) | (15,149) | (13,361)
Currency translation differences | 37 | 155 | 223
Depreciation | (1,960) | (2,317) | (2,096)
Disposals | (1,325) | (326) | (85)
Assets held for sale | 915 | 0 |
Reclassification |  |  | 0
Property, plant and equipment at year-end | (16,668) | (16,985) | (15,149)
Accumulated depreciation, amortisation and impairment [member] | Production facilities and machinery [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | (109,987) | (95,047) | (103,704)
Currency translation differences | 246 | 1,880 | 480
Depreciation | (12,468) | (16,820) | (16,708)
Disposals | (900) | 0 | (34)
Assets held for sale | 4,692 | 0 |
Reclassification |  |  | 24,851
Property, plant and equipment at year-end | (116,617) | (109,987) | (95,047)
Accumulated depreciation, amortisation and impairment [member] | Buildings and improvements |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | (6,975) | (6,596) | (5,902)
Currency translation differences | 16 | 39 | 110
Depreciation | (700) | (490) | (804)
Disposals | (838) | (72) | 0
Assets held for sale | 153 | 0 |
Reclassification |  |  | 0
Property, plant and equipment at year-end | (6,668) | (6,975) | (6,596)
Accumulated depreciation, amortisation and impairment [member] | Construction in Progress [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | 0 | 0 | 0
Currency translation differences | 0 | 0 | 0
Depreciation | 0 | 0 | 0
Disposals | 0 | 0 | 0
Assets held for sale | 0 | 0 |
Reclassification |  |  | 0
Property, plant and equipment at year-end | 0 | 0 | 0
Accumulated depreciation, amortisation and impairment [member] | Exploration and evaluation assets [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment at the beginning | 0 | 0 | 0
Currency translation differences | 0 | 0 | 0
Depreciation | 0 | 0 | 0
Disposals | 0 | 0 | 0
Assets held for sale | 0 | 0 |
Reclassification |  |  | 0
Property, plant and equipment at year-end | $ 0 | $ 0 | $ 0

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- Definition The decrease in property, plant and equipment resulting from the loss of control of a subsidiary. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_75_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_a&doctype=Standard -URIDate 2021-03-24 + Details
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