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Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 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 three-month periods ended March 31, 2025 and 2024.
(Thousands of dollars)20252024
Beginning balance at January 1$72,055 $49,118 
  Additions pending the determination of proved reserves24,790 11,538 
  Capitalized exploratory well costs charged to expense— (26,471)
Balance at March 31$96,845 $34,185 
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.
March 31,
20252024
(Thousands of dollars)AmountNo. of WellsAmountNo. of Wells
Aging of capitalized well costs:
Zero to one year$9,421 2 $11,641 4 
One to two years65,160 3 — — 
Two to three years— — — — 
Three years or more22,264 3 22,544 3 
$96,845 8 $34,185 7