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Exploratory Well Costs
 12 Months Ended
Dec. 31, 2014
Capitalized Exploratory Well Costs [Abstract]  
Exploratory Well Costs
16.  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.

At December 31, 2014 and 2013, all exploratory well costs had been capitalized for periods of less than one year.