v3.26.1
Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 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 six months ended June 30, 2026 and 2025 are shown in the following table.
(Thousands of dollars)June 30, 2026June 30, 2025
Balance at beginning of year$1,012,867 $1,008,884 
Accretion29,384 28,477 
Liabilities incurred12,256 5,428 
Revisions of previous estimates 3,999 
Liabilities settled(8,265)(6,359)
Changes due to translation of foreign currencies(5,656)9,784 
Balance at end of period1,040,586 1,050,213 
Current portion of liability
(59,231)(70,104)
Non-current portion of liability$981,355 $980,109