v3.26.3
Property, Plant and Equipment (Tables)
 9 Months Ended
Sep. 30, 2026
Property, Plant, and Equipment [Abstract]  
Schedule of Net Changes in Capitalized Exploratory Well Costs The following table reflects the net changes in capitalized exploratory well costs during the nine months ended September 30, 2026 and 2025.
(Thousands of dollars)20262025
Beginning balance at January 1$191,821 $72,055 
  Additions pending the determination of proved reserves317,581 43,091 
  Reclassifications to proved properties based on the
  determination of proved reserves		(4,646)— 
  Capitalized exploratory well costs charged to expense(10,627)— 
Balance at September 30$494,129 $115,146 
Schedule of Aging of Capitalized Exploratory Well Costs
The following table provides an aging of capitalized exploration costs based on the date the drilling operations were initiated for each individual project.
September 30,
20262025
(Thousands of dollars)AmountNo. of ProjectsAmountNo. of Projects
Aging of capitalized well costs:
Zero to one year$10,571 1 $17,562 5 
One to two years344,780 3 75,171 3 
Two to three years120,946 3 — — 
Three years or more17,832 2 22,413 3 
$494,129 9 $115,146 11