Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2025

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 three-month periods ended March 31, 2025 and 2024 are shown in the following table.

(Thousands of dollars)	March 31, 2025		March 31, 2024
Balance at beginning of year	$	1,008,884	$	914,763
Accretion	14,045		12,774
Liabilities incurred	4,996		8,960
Revisions of previous estimates	3,999		1,995
Liabilities settled	(157)		(737)
Changes due to translation of foreign currencies	394		(3,143)
Balance at end of period	1,032,161		934,612
Current portion of liability	(77,452)		(17,797)
Non-current portion of liability	$	954,709	$	916,815