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Exploratory Well Costs (Tables)
 9 Months Ended
Sep. 30, 2018
Capitalized Exploratory Well Costs [Abstract]  
Net Changes In Capitalized Exploratory Well Costs
EOG's net changes in capitalized exploratory well costs for the nine-month period ended September 30, 2018, are presented below (in thousands):
 
Nine Months Ended 
 September 30, 2018
Balance at January 1
$
2,167

Additions Pending the Determination of Proved Reserves
6,497

Reclassifications to Proved Properties
(5,346
)
Costs Charged to Expense
(433
)
Balance at September 30
$
2,885