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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
 
December 31, 2019
 
December 31, 2018
 
(Thousands of dollars)
Cost
 
Net
 
Cost
 
Net
 
Exploration and production ¹
$
19,096,323

 
9,875,727

2 
16,309,149

 
8,329,514

2 
Corporate and other
207,066

 
94,016

 
193,471

 
102,619

 
Property, plant and equipment
$
19,303,389

 
9,969,743

 
16,502,620

 
8,432,133

 
¹  Includes unproved mineral rights as follows:
$
508,526

 
121,163

 
512,025

 
144,912

 
2  Includes $24,698 in 2019 and $27,915 in 2018 related to administrative assets and support equipment.
Schedule of Recognized Impairments
The following table reflects the recognized impairments for the three years ended December 31, 2019.
 
December 31,
(Thousands of dollars)
2019
 
2018
 
2017
U.S. Onshore (Midland)
$
—

 
20,000

 
—

 
$
—

 
20,000

 
—
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, 2019.
(Thousands of dollars)
2019
 
2018
 
2017
Beginning balance at January 1
$
207,855

 
155,103

 
101,546

Additions pending the determination of proved reserves
83,712

 
59,487

 
53,557

Reclassifications to proved properties based on the determination of proved reserves
(61,096
)
 
(2,214
)
 
—

Capitalized exploration well costs charged to expense
(13,145
)
 
(4,521
)
 
—

Ending balance at December 31
$
217,326

 
207,855

 
155,103
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.

2019
 
2018
 
2017
(Thousands of dollars)
Amount
 
No. of
Wells
 
No. of
Projects
 
Amount
 
No. of
Wells
 
No. of
Projects
 
Amount
 
No. of
Wells
 
No. of
Projects
Aging of capitalized well costs:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Zero to one year
$
63,409

 
5

 
5

 
$
61,096

 
1
 
1
 
$
41,480

 
3
 
2
One to two years
—

 
—

 
—

 
40,523

 
3
 
2
 
5,812

 
1
 
1
Two to three years
27,396

 
1

 
—

 
5,208

 
1
 
1
 
43,200

 
2
 
2
Three years or more
126,521

 
5

 
—

 
101,028

 
4
 
1
 
64,611

 
6
 
1

$
217,326

 
11

 
5

 
$
207,855

 
9
 
5
 
$
155,103

 
12
 
6