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Supplemental information on oil and gas activities (Schedule of Capitalized Costs Related to Oil and Gas Producing Activities) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |
Proved properties, Equipment, camps and other facilities | $ 201,177 | $ 197,829 | $ 172,507
Proved properties, Mineral interest and wells | 957,932 | 968,617 | 830,937
Proved properties, Other uncompleted projects | 27,204 | 15,477 | 32,712
Unproved properties | 94,690 | 77,820 | 48,036
Gross capitalised costs | 1,281,003 | 1,259,743 | 1,084,192
Accumulated depreciation | (679,774) | (658,432) | (562,853)
Total net capitalised costs | 601,229 | 601,311 | 521,339
Colombia [Member] |  |  |
Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |
Proved properties, Equipment, camps and other facilities | 125,078 | 115,577 | 79,999
Proved properties, Mineral interest and wells | 580,931 | 511,040 | 282,973
Proved properties, Other uncompleted projects | 26,136 | 13,048 | 19,754
Unproved properties | 94,419 | 77,388 | 567
Gross capitalised costs | 826,564 | 717,053 | 383,293
Accumulated depreciation | (282,616) | (228,929) | (172,207)
Total net capitalised costs | 543,948 | 488,124 | 211,086
Chile [Member] |  |  |
Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |
Proved properties, Equipment, camps and other facilities | 72,766 | 74,363 | 84,069
Proved properties, Mineral interest and wells | 334,993 | 348,366 | 402,392
Proved properties, Other uncompleted projects | 818 | 2,158 | 11,984
Unproved properties |  | 0 | 45,681
Gross capitalised costs | 408,577 | 424,887 | 544,126
Accumulated depreciation | (358,417) | (345,611) | (313,379)
Total net capitalised costs | 50,160 | 79,276 | 230,747
Brazil [Member] |  |  |
Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |
Proved properties, Equipment, camps and other facilities | 3,333 | 3,580 | 4,615
Proved properties, Mineral interest and wells | 42,008 | 47,729 | 64,179
Proved properties, Other uncompleted projects | 250 | 245 | 209
Unproved properties | 271 | 432 | 1,788
Gross capitalised costs | 45,862 | 51,986 | 70,791
Accumulated depreciation | (38,741) | (38,273) | (46,370)
Total net capitalised costs | 7,121 | 13,713 | 24,421
Argentina [Member] |  |  |
Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |
Proved properties, Equipment, camps and other facilities |  | 4,309 | 3,824
Proved properties, Mineral interest and wells |  | 61,482 | 81,393
Proved properties, Other uncompleted projects |  | 26 | 765
Unproved properties |  | 0 | 0
Gross capitalised costs | 0 | 65,817 | 85,982
Accumulated depreciation |  | (45,619) | (30,897)
Total net capitalised costs | $ 0 | $ 20,198 | $ 55,085

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