v3.26.3
Asset Retirement Obligations (Tables)
9 Months Ended
Sep. 30, 2026
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 months ended September 30, 2026 and 2025 are shown in the following table.
(Thousands of dollars)September 30, 2026September 30, 2025
Balance at beginning of year$1,012,867 $1,008,884 
Accretion44,440 43,153 
Liabilities incurred46,829 14,267 
Revisions of previous estimates— 7,489 
Liabilities settled(32,562)(32,145)
Changes due to translation of foreign currencies(6,180)6,147 
Balance at end of period1,065,394 1,047,795 
Current portion of liability
(46,866)(45,876)
Non-current portion of liability$1,018,528 $1,001,919