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Exploratory Well Costs (Notes)
 12 Months Ended
Dec. 31, 2020
Capitalized Exploratory Well Costs [Abstract]  
Exploratory Well Costs 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):
 202020192018
Balance at January 1$25,897 $4,121 $2,167 
Additions Pending the Determination of Proved Reserves107,852 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.

 202020192018
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 year1 — — 
(1)    Consists of costs related to a project in the United States at December 31, 2020.