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Property, Plant and Equipment (Tables)
 9 Months Ended
Sep. 30, 2025
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-month periods ended September 30, 2025 and 2024.
(Thousands of dollars)20252024
Beginning balance at January 1$72,055 $49,118 
  Additions pending the determination of proved reserves43,091 28,452 
  Capitalized exploratory well costs charged to expense— (26,471)
Balance at September 30$115,146 $51,099 
Schedule of Aging of Capitalized Exploratory Well Costs
The following table provides an aging of capitalized exploration well costs based on the date the drilling was completed for each individual well.
September 30,
20252024
(Thousands of dollars)AmountNo. of WellsAmountNo. of Wells
Aging of capitalized well costs:
Zero to one year$17,562 5 $28,552 3 
One to two years75,171 3 — — 
Two to three years— — — — 
Three years or more22,413 3 22,547 3 
$115,146 11 $51,099 6