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Exploratory Well Costs (Notes)
 12 Months Ended
Dec. 31, 2019
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, 2019, 2018 and 2017 are presented below (in thousands):
 
2019
 
2018
 
2017
 
 
 
 
 
 
Balance at January 1
$
4,121

 
$
2,167

 
$
—

Additions Pending the Determination of Proved Reserves
83,175

 
10,304

 
27,487

Reclassifications to Proved Properties
(39,325
)
 
(7,917
)
 
(20,802
)
Costs Charged to Expense (1)
(22,074
)
 
(433
)
 
(4,518
)
Balance at December 31
$
25,897

 
$
4,121

 
$
2,167

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

At December 31, 2019, 2018 and 2017, all exploratory well costs had been capitalized for periods of less than one year.