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Exploratory Well Costs (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2014, 2013 and 2012 are presented below (in thousands):
 
2014
 
2013
 
2012
 
 
 
 
 
 
 
 
Balance at January 1
$
9,211

 
$
49,116

 
$
61,111

 
Additions Pending the Determination of Proved Reserves
32,080

 
52,099

 
73,332

 
Reclassifications to Proved Properties
(15,946
)
 
(54,505
)
 
(69,462
)
 
Costs Charged to Expense (1)
(8,092
)
 
(35,859
)
 
(17,115
)
 
Foreign Currency Translations
—

 
(1,640
)
 
1,250

 
Balance at December 31
$
17,253

 
$
9,211

 
$
49,116

(2) 
 
(1)
Includes capitalized exploratory well costs charged to either dry hole costs or impairments.
(2)
At December 31, 2012, exploratory well costs totaling $21 million related to an outside operated offshore Central North Sea project in the United Kingdom that had been capitalized for more than one year.