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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 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 respective periods presented is shown in the following table.
(Thousands of dollars)20252024
Balance at beginning of year$1,008,884 $914,763 
Accretion57,730 52,511 
Liabilities incurred20,744 25,619 
Revisions of previous estimates(12,094)29,279 
Liabilities settled(70,829)(1,898)
Changes due to translation of foreign currencies8,432 (11,390)
Balance at end of period1,012,867 1,008,884 
Current portion of liability(41,959)(48,080)
Non-current portion of liability$970,908 $960,804