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Exploratory Well Costs (Notes)
 9 Months Ended
Sep. 30, 2019
Capitalized Exploratory Well Costs [Abstract]  
Exploratory Well Costs Exploratory Well Costs

EOG's net changes in capitalized exploratory well costs for the nine-month period ended September 30, 2019, are presented below (in thousands):
 
Nine Months Ended September 30, 2019
Balance at January 1
$
4,121

Additions Pending the Determination of Proved Reserves
48,917

Reclassifications to Proved Properties
(6,286
)
Costs Charged to Expense
(22,421
)
Balance at September 30
$
24,331



At September 30, 2019, all capitalized exploratory well costs had been capitalized for periods of less than one year.