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Exploratory Well Costs (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015, 2014 and 2013 are presented below (in thousands):
 
2015
 
2014
 
2013
 
 
 
 
 
 
Balance at January 1
$
17,253

 
$
9,211

 
$
49,116

Additions Pending the Determination of Proved Reserves
24,640

 
32,080

 
52,099

Reclassifications to Proved Properties
(26,659
)
 
(15,946
)
 
(54,505
)
Costs Charged to Expense (1)
(6,279
)
 
(8,092
)
 
(35,859
)
Foreign Currency Translations
—

 
—

 
(1,640
)
Balance at December 31
$
8,955

 
$
17,253

 
$
9,211

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