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Asset Retirement Obligations (Tables) | 9 Months Ended
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Sep. 30, 2025
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Reconciliation of Beginning and Ending Aggregate Carrying Amount of Asset Retirement Obligations | A reconciliation of the beginning and ending aggregate carrying amount of the ARO for the nine-month periods ended September 30, 2025 and 2024 are shown in the following table.
(Thousands of dollars) | September 30, 2025 |  | September 30, 2024
Balance at beginning of year | $ | 1,008,884 |  |  | $ | 914,763 |
Accretion | 43,153 |  |  | 39,068 |
Liabilities incurred | 14,267 |  |  | 17,975 |
Revisions of previous estimates | 7,489 |  |  | 2,452 |
Liabilities settled | (32,145) |  |  | (1,982) |
Changes due to translation of foreign currencies | 6,147 |  |  | (2,618) |
Balance at end of period | 1,047,795 |  |  | 969,658 |
Current portion of liability | (45,876) |  |  | (39,693) |
Non-current portion of liability | $ | 1,001,919 |  |  | $ | 929,965 |

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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