Asset Retirement Obligations (Tables)

9 Months Ended

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.