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Asset Retirement Obligations (Tables) | 3 Months Ended
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Mar. 31, 2026
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 three-month periods ended March 31, 2026 and 2025 are shown in the following table.
(Thousands of dollars) | March 31, 2026 |  | March 31, 2025
Balance at beginning of year | $ | 1,012,867 |  |  | $ | 1,008,884 |
Accretion | 14,514 |  |  | 14,045 |
Liabilities incurred | 10,064 |  |  | 4,996 |
Revisions of previous estimates | — |  |  | 3,999 |
Liabilities settled | (8,941) |  |  | (157) |
Changes due to translation of foreign currencies | (2,371) |  |  | 394 |
Balance at end of period | 1,026,133 |  |  | 1,032,161 |
Current portion of liability | (53,630) |  |  | (77,452) |
Non-current portion of liability | $ | 972,503 |  |  | $ | 954,709 |

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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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