Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 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 nine-month periods ended September 30, 2024 and 2023 are shown in the following table.

(Thousands of dollars)	September 30, 2024		September 30, 2023
Balance at beginning of year	$	914,763	$	911,653
Accretion	39,068		34,196
Liabilities incurred	17,975		16,441
Revisions of previous estimates	2,452		(822)
Liabilities settled	(1,982)		(89,340)
Changes due to translation of foreign currencies	(2,618)		(340)
Balance at end of period	969,658		871,788
Current portion of liability 1	(39,693)		(12,665)
Noncurrent portion of liability	$	929,965	$	859,123

1 Included in “Other accrued liabilities” on the Consolidated Balance Sheets.