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Asset Retirement Obligations (Tables) | 9 Months Ended
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Sep. 30, 2023
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, 2023 and 2022 is shown in the following table.
(Thousands of dollars) | September 30, 2023 |  | September 30, 2022
Balance at beginning of year | $ | 911,653 |  |  | $ | 971,893 |
Accretion | 34,196 |  |  | 34,725 |
Liabilities incurred | 16,441 |  |  | (18,555) |
Revisions of previous estimates | (822) |  |  | – |
Liabilities settled | (89,340) |  |  | (28,927) |
Changes due to translation of foreign currencies | (340) |  |  | (13,592) |
Balance at end of period | 871,788 |  |  | 945,544 |
Current portion of liability 1 | (12,665) |  |  | (96,937) |
Noncurrent portion of liability | $ | 859,123 |  |  | $ | 848,607 |
1 Included in “Other accrued liabilities” on the Consolidated Balance Sheets.

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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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