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Exploratory Well Costs
 12 Months Ended
Dec. 31, 2016
Capitalized Exploratory Well Costs [Abstract]  
Exploratory Well Costs
Exploratory Well Costs

EOG's net changes in capitalized exploratory well costs for the years ended December 31, 2016, 2015 and 2014 are presented below (in thousands):
 
2016
 
2015
 
2014
 
 
 
 
 
 
Balance at January 1
$
8,955

 
$
17,253

 
$
9,211

Additions Pending the Determination of Proved Reserves
6,688

 
24,640

 
32,080

Reclassifications to Proved Properties
(5,274
)
 
(26,659
)
 
(15,946
)
Costs Charged to Expense (1)
(10,369
)
 
(6,279
)
 
(8,092
)
Balance at December 31
$
—

 
$
8,955

 
$
17,253

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

At December 31, 2016, 2015 and 2014, all exploratory well costs had been capitalized for periods of less than one year.