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Exploratory Well Costs
12 Months Ended
Dec. 31, 2013
Exploratory Well Costs [Abstract]  
Exploratory Well Costs
15.  Exploratory Well Costs

EOG's net changes in capitalized exploratory well costs for the years ended December 31, 2013, 2012 and 2011 are presented below (in thousands):

 
 
2013
  
2012
  
2011
 
 
 
  
  
 
Balance at January 1
 
$
49,116
  
$
61,111
  
$
99,801
 
Additions Pending the Determination of Proved Reserves
  
52,099
   
73,332
   
31,271
 
Reclassifications to Proved Properties
  
(54,505
)
  
(69,462
)
  
(29,227
)
Costs Charged to Expense (1)
  
(35,859
)
  
(17,115
)
  
(42,178
)
Foreign Currency Translations
  
(1,640
)
  
1,250
   
1,444
 
Balance at December 31
 
$
9,211
  
$
49,116
  
$
61,111
 

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

The following table provides an aging of capitalized exploratory well costs at December 31, 2013, 2012 and 2011 (in thousands, except well count):

 
 
2013
  
2012
  
2011
  
 
 
  
  
  
Capitalized exploratory well costs that have been capitalized for a period less than one year
 
$
9,211
  
$
28,319
  
$
17,009
  
Capitalized exploratory well costs that have been capitalized for a period greater than one year
  
-
   
20,797
 
(1) 
  
44,102
 (2) 
Total
 
$
9,211
  
$
49,116
  
$
61,111
  
Number of exploratory wells that have been capitalized for a period greater than one year
  
-
   
1
   
4
  

(1)Consists of costs related to an outside operated, offshore Central North Sea natural gas project in the United Kingdom (U.K.).
(2)Consists of costs related to an outside operated, offshore Central North Sea project in the U.K. ($20 million), an East Irish Sea project in the U.K. ($9 million), a project in the Sichuan Basin, Sichuan Province, China ($9 million), and a shale project in British Columbia, Canada ($6 million).