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Exploratory Well Costs (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017, 2016 and 2015 are presented below (in thousands):
 
2017
 
2016
 
2015
 
 
 
 
 
 
Balance at January 1
$
—

 
$
8,955

 
$
17,253

Additions Pending the Determination of Proved Reserves
27,487

 
6,688

 
24,640

Reclassifications to Proved Properties
(20,802
)
 
(5,274
)
 
(26,659
)
Costs Charged to Expense (1)
(4,518
)
 
(10,369
)
 
(6,279
)
Balance at December 31
$
2,167

 
$
—

 
$
8,955

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