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Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 2022
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 three-month periods ended March 31, 2022 and 2021.
(Thousands of dollars)20222021
Beginning balance at January 1$179,481 181,616 
Additions pending the determination of proved reserves3,698 785 
Capitalized exploratory well costs charged to expense(10,473)— 
Balance at March 31$172,706 182,401 
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.
March 31,
20222021
(Thousands of dollars)AmountNo. of WellsNo. of ProjectsAmountNo. of WellsNo. of Projects
Aging of capitalized well costs:
Zero to one year$2,810 2 2 — — — 
One to two years— — — 23,514 3 3 
Two to three years23,667 3 3 30,562 2 2 
Three years or more146,229 8 2 128,325 6 — 
$172,706 13 7 182,401 11 5