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Property, Plant and Equipment (Tables)
 6 Months Ended
Jun. 30, 2023
Property, Plant and Equipment [Abstract]  
Net Changes in Capitalized Exploratory Well Costs The following table reflects the net changes in capitalized exploratory well costs during the six-month periods ended June 30, 2023 and 2022.
(Thousands of dollars)20232022
Beginning balance at January 1$171,860 $179,481 
  Additions pending the determination of proved reserves47,733 9,412 
  Capitalized exploratory well costs charged to expense(26,188)(10,472)
Balance at June 30$193,405 $178,421 
Aging of Capitalized Exploratory Well Costs
The following table provides an aging of capitalized exploratory well costs based on the date the drilling was completed for each individual well and the number of projects for which exploratory well costs have been capitalized. The projects are aged based on the last well drilled in the project.
June 30,
20232022
(Thousands of dollars)AmountNo. of WellsNo. of ProjectsAmountNo. of WellsNo. of Projects
Aging of capitalized well costs:
Zero to one year$8,494 1 1 $4,268 2 2 
One to two years38,497 1 1 2,813 2 2 
Two to three years2,698 1 1 26,848 3 2 
Three years or more143,716 4 3 144,492 8 2 
$193,405 7 6 $178,421 15 8