Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 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 respective periods presented is shown in the following table.

(Thousands of dollars)	2023		2022
Balance at beginning of year	$	911,653	$	971,893
Accretion	46,059		46,243
Liabilities incurred	20,628		46,449
Revisions of previous estimates	29,056		(78,229)
Liabilities settled	(95,637)		(64,255)
Changes due to translation of foreign currencies	3,004		(10,448)
Balance at end of year	914,763		911,653
Current portion of liability ¹	(10,712)		(94,385)
Noncurrent portion of liability	$	904,051	$	817,268

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