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Asset Retirement Obligations (Tables) | 6 Months Ended
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Jun. 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 six-month periods ended June 30, 2023 and 2022 is shown in the following table.
(Thousands of dollars) | June 30, 2023 |  | June 30, 2022
Balance at beginning of year | $ | 911,653 |  |  | 971,893 |
Accretion | 22,521 |  |  | 23,439 |
Liabilities incurred | 4,805 |  |  | 9,007 |
Revisions of previous estimates | (822) |  |  | — |
Liabilities settled | (64,978) |  |  | (26,144) |
Changes due to translation of foreign currencies | 2,920 |  |  | (3,650) |
Balance at end of year | 876,099 |  |  | 974,545 |
Current portion of liability at June 30 ¹ | (32,771) |  |  | (110,653) |
Noncurrent portion of liability at June 30 | $ | 843,328 |  |  | 863,892 |
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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