Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 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 nine-month periods ended September 30, 2022 and 2021.

(Thousands of dollars)	2022		2021
Beginning balance at January 1	$	179,481	181,616
Additions pending the determination of proved reserves	22,275		5,007
Capitalized exploratory well costs charged to expense	(20,295)		—
Balance at September 30	$	181,461	186,623

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.

	September 30,
	2022				2021
(Thousands of dollars)	Amount		No. of Wells	No. of Projects	Amount	No. of Wells	No. of Projects
Aging of capitalized well costs:
Zero to one year	$	8,851	2	2	3,297	2	2
One to two years	8,489		2	2	—	—	—
Two to three years	—		—	—	53,078	5	5
Three years or more	164,121		6	3	130,248	6	—
	$	181,461	10	7	186,623	13	7