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Asset Retirement Obligations (Tables) | 6 Months Ended
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Jun. 30, 2024
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 six-month periods ended June 30, 2024 and 2023 are shown in the following table.
(Thousands of dollars) | June 30, 2024 |  | June 30, 2023
Balance at beginning of year | $ | 914,763 |  |  | $ | 911,653 |
Accretion | 25,827 |  |  | 22,521 |
Liabilities incurred | 14,199 |  |  | 4,805 |
Revisions of previous estimates | 1,995 |  |  | (822) |
Liabilities settled | (2,925) |  |  | (64,978) |
Changes due to translation of foreign currencies | (4,541) |  |  | 2,920 |
Balance at end of period | 949,318 |  |  | 876,099 |
Current portion of liability 1 | (25,622) |  |  | (32,771) |
Noncurrent portion of liability | $ | 923,696 |  |  | $ | 843,328 |
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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