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Supplemental information on oil and gas activities (Schedule of Changes in the Standardized Measure of Discounted Future Net Cash Flows from Proved Reserves) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |
Balance Beginning | $ 801,624 | $ 1,593,735 | $ 1,783,842
Sales of hydrocarbon, net of production costs | (560,896) | (236,797) | (456,381)
Net changes in sales price and production costs | 1,005,171 | (1,108,304) | (349,437)
Changes in estimated future development costs | 99,168 | 512,994 | (464,050)
Extensions and discoveries less related costs | 79,913 | 73,812 | 200,157
Development costs incurred | 91,988 | 81,276 | 78,487
Revisions of previous quantity estimates | (88,204) | (36,683) | 439,973
Purchase or (Disposals) of Minerals in place |  | (30,902) |
Net changes in income taxes | (257,154) | (281,554) | 77,779
Accretion of discount | 121,123 | 234,047 | 283,365
Balance Ending | 1,292,733 | 801,624 | 1,593,735
Colombia [Member] |  |  |
Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |
Balance Beginning | 759,233 | 1,313,572 | 1,379,063
Sales of hydrocarbon, net of production costs | (516,844) | (221,620) | (411,528)
Net changes in sales price and production costs | 924,875 | (975,716) | (299,642)
Changes in estimated future development costs | 96,364 | 514,317 | (268,377)
Extensions and discoveries less related costs | 80,933 | 59,898 | 182,857
Development costs incurred | 87,877 | 69,694 | 69,694
Revisions of previous quantity estimates | (76,850) | (27,190) | 415,349
Purchase or (Disposals) of Minerals in place |  | 90,315 |
Net changes in income taxes | (254,618) | (281,264) | 23,398
Accretion of discount | 116,851 | 217,227 | 222,758
Balance Ending | 1,217,821 | 759,233 | 1,313,572
Chile [Member] |  |  |
Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |
Balance Beginning | 17,032 | 104,223 | 89,830
Sales of hydrocarbon, net of production costs | (11,520) | (12,803) | (14,284)
Net changes in sales price and production costs | 64,048 | (117,895) | 12,799
Changes in estimated future development costs | (18,731) | 20,870 | (22,163)
Extensions and discoveries less related costs | 0 | 13,914 | 17,300
Development costs incurred | 4,111 | 10,743 | 4,023
Revisions of previous quantity estimates | (23,776) | (13,002) | 9,508
Purchase or (Disposals) of Minerals in place |  | 0 |
Net changes in income taxes | 0 | 0 | (2,025)
Accretion of discount | 1,703 | 10,982 | 9,235
Balance Ending | 32,867 | 17,032 | 104,223
Brazil [Member] |  |  |
Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |
Balance Beginning | 25,378 | 43,382 | 41,549
Sales of hydrocarbon, net of production costs | (15,677) | 8,080 | (17,289)
Net changes in sales price and production costs | 19,393 | (14,580) | 6,923
Changes in estimated future development costs | 861 | (19,606) | 1,165
Extensions and discoveries less related costs | 0 | 0 | 0
Development costs incurred | 0 | 394 | 445
Revisions of previous quantity estimates | 11,957 | 3,519 | 5,482
Purchase or (Disposals) of Minerals in place |  | 0 |
Net changes in income taxes | (2,780) | (290) | 729
Accretion of discount | 2,571 | 4,479 | 4,378
Balance Ending | 41,703 | 25,378 | 43,382
Argentina [Member] |  |  |
Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |
Balance Beginning | (19) | 11,341 | 34,867
Sales of hydrocarbon, net of production costs | (16,855) | (10,454) | (13,280)
Net changes in sales price and production costs | (3,145) | (113) | (20,694)
Changes in estimated future development costs | 20,674 | (2,587) | 573
Extensions and discoveries less related costs | (1,020) | 0 | 0
Development costs incurred | 0 | 445 | 4,325
Revisions of previous quantity estimates | 465 | (10) | (2,358)
Purchase or (Disposals) of Minerals in place |  | 0 |
Net changes in income taxes | 244 | 0 | 3,760
Accretion of discount | (2) | 1,359 | 4,148
Balance Ending | 342 | (19) | 11,341
Peru [Member] |  |  |
Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |
Balance Beginning | 0 | 121,217 | 238,533
Sales of hydrocarbon, net of production costs | 0 | 0 | 0
Net changes in sales price and production costs | 0 | 0 | (48,823)
Changes in estimated future development costs | 0 | 0 | (175,248)
Extensions and discoveries less related costs | 0 | 0 | 0
Development costs incurred | 0 | 0 | 0
Revisions of previous quantity estimates | 0 | 0 | 11,992
Purchase or (Disposals) of Minerals in place |  | (121,217) |
Net changes in income taxes | 0 | 0 | 51,917
Accretion of discount | 0 | 0 | 42,846
Balance Ending | $ 0 | $ 0 | $ 121,217

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