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Supplemental information on oil and gas activities (Schedule of Standardized Measure of Discounted Future Net Cash Flows Related to Proved Oil and Gas Reserves) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |  |
Future cash inflows | $ 4,716,229 | $ 2,844,129 | $ 6,146,610 |
Future production costs | (1,881,211) | (1,034,109) | (1,928,321) |
Future development costs | (288,955) | (253,474) | (642,373) |
Future income taxes | (760,601) | (409,603) | (1,011,370) |
Undiscounted future net cash flows | 1,785,462 | 1,146,943 | 2,564,546 |
10% annual discount | (492,729) | (345,319) | (970,811) |
Standardized measure of discounted future net cash flows | 1,292,733 | 801,624 | 1,593,735 | $ 1,783,842
Colombia [Member] |  |  |  |
Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |  |
Future cash inflows | 4,381,191 | 2,561,947 | 4,323,914 |
Future production costs | (1,715,554) | (850,029) | (1,159,621) |
Future development costs | (197,461) | (197,859) | (276,804) |
Future income taxes | (754,205) | (409,276) | (858,700) |
Undiscounted future net cash flows | 1,713,971 | 1,104,783 | 2,028,789 |
10% annual discount | (496,150) | (345,550) | (715,217) |
Standardized measure of discounted future net cash flows | 1,217,821 | 759,233 | 1,313,572 | 1,379,063
Chile [Member] |  |  |  |
Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |  |
Future cash inflows | 136,152 | 130,200 | 294,202 |
Future production costs | (69,067) | (82,290) | (104,688) |
Future development costs | (40,339) | (28,620) | (35,420) |
Future income taxes | 0 | 0 | (5,594) |
Undiscounted future net cash flows | 26,746 | 19,290 | 148,500 |
10% annual discount | 6,121 | (2,258) | (44,277) |
Standardized measure of discounted future net cash flows | 32,867 | 17,032 | 104,223 | 89,830
Brazil [Member] |  |  |  |
Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |  |
Future cash inflows | 89,208 | 68,857 | 86,191 |
Future production costs | (34,930) | (36,254) | (32,608) |
Future development costs | (1,955) | (2,355) | (2,166) |
Future income taxes | (3,449) | (327) | (1,409) |
Undiscounted future net cash flows | 48,874 | 29,921 | 50,008 |
10% annual discount | (7,171) | (4,543) | (6,626) |
Standardized measure of discounted future net cash flows | 41,703 | 25,378 | 43,382 | 41,549
Argentina [Member] |  |  |  |
Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |  |
Future cash inflows | 109,678 | 83,125 | 187,064 |
Future production costs | (61,660) | (65,536) | (118,797) |
Future development costs | (49,200) | (24,640) | (49,595) |
Future income taxes | (2,947) | 0 | (2,251) |
Undiscounted future net cash flows | (4,129) | (7,051) | 16,421 |
10% annual discount | 4,471 | 7,032 | (5,080) |
Standardized measure of discounted future net cash flows | 342 | (19) | 11,341 | 34,867
Peru [Member] |  |  |  |
Disclosure Of Supplemental information on oil and gas activities [Line Items] |  |  |  |
Future cash inflows | 0 | 0 | 1,255,239 |
Future production costs | 0 | 0 | (512,607) |
Future development costs | 0 | 0 | (278,388) |
Future income taxes | 0 | 0 | (143,416) |
Undiscounted future net cash flows | 0 | 0 | 320,828 |
10% annual discount | 0 | 0 | (199,611) |
Standardized measure of discounted future net cash flows | $ 0 | $ 0 | $ 121,217 | $ 238,533

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