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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
The Company’s property, plant and equipment assets for the respective periods are presented as follows.

December 31, 2022December 31, 2021
(Thousands of dollars)CostNetCostNet
Exploration and production ¹$20,567,489 $8,204,463 
2
$20,440,568 $8,098,396 
2
Corporate and other150,498 23,553 145,135 29,456 
Property, plant and equipment$20,717,987 $8,228,016 $20,585,703 $8,127,852 
¹  Includes unproved mineral rights as follows:$476,981 $344,507 $615,724 $131,107 
2  Includes $18,319 in 2022 and $22,543 in 2021 related to administrative assets and support equipment.
Schedule of Recognized Impairments
The following table reflects the recognized before tax impairments for the three years ended December 31, 2022.
December 31,
(Thousands of dollars)202220212020
Canada$— $171,296 $— 
Other Foreign— 18,000 39,709 
Corporate— 7,000 14,060 
U.S.— — 1,152,515 
$— $196,296 $1,206,284 
Net Changes in Capitalized Exploratory Well Costs The following table reflects the net changes in capitalized exploratory well costs during the three-year period ended December 31, 2022.
(Thousands of dollars)
202220212020
Beginning balance at January 1$179,481 $181,616 $217,326 
Additions pending the determination of proved reserves33,440 16,725 3,999 
Divestment
(7,915)— — 
Capitalized exploration well costs charged to expense(33,146)(18,860)(39,709)
Ending balance at December 31$171,860 $179,481 $181,616 
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 has been capitalized. The projects are aged based on the last well drilled in the project.
202220212020
(Thousands of dollars)
AmountNo. of
Wells		No. of
Projects		AmountNo. of
Wells		No. of
Projects		AmountNo. of
Wells		No. of
Projects
Aging of capitalized well costs:
Zero to one year$15,527 22$13,273 33$— ——
One to two years13,307 22— ——54,220 55
Two to three years— ——53,070 55— ——
Three years or more143,026 54113,138 6—127,396 6—
$171,860 98$179,481 148$181,616 115