Exploratory Well Costs (Tables)

12 Months Ended

Dec. 31, 2020

Capitalized Exploratory Well Costs [Abstract]

Net Changes in Capitalized Exploratory Well Costs

EOG's net changes in capitalized exploratory well costs for the years ended December 31, 2020, 2019 and 2018 are presented below (in thousands):

	2020		2019		2018
Balance at January 1	$	25,897	$	4,121	$	2,167
Additions Pending the Determination of Proved Reserves	107,852		83,175		10,304
Reclassifications to Proved Properties	(81,071)		(39,325)		(7,917)
Costs Charged to Expense (1)	(23,822)		(22,074)		(433)
Balance at December 31	$	28,856	$	25,897	$	4,121

(1)    Includes capitalized exploratory well costs charged to either dry hole costs or impairments.

Schedule of Aging of Capitalized Exploratory Well Costs

	2020		2019		2018
Capitalized exploratory well costs that have been capitalized for a period of one year or less	$	26,408	$	25,897	$	4,121
Capitalized exploratory well costs that have been capitalized for a period greater than one year (1)	2,448		—		—
Balance at December 31	$	28,856	$	25,897	$	4,121
Number of exploratory wells that have been capitalized for a period greater than one year	1		—		—

(1)    Consists of costs related to a project in the United States at December 31, 2020.