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Accounting for Suspended Exploratory Wells (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting for Suspended Exploratory Wells [Abstract]  
Changes in company's suspended exploratory well costs
The following table indicates the changes to the company’s suspended exploratory well costs for the three years ended December 31, 2016:
 
2016

2015

2014

Beginning balance at January 1
$
3,312

$
4,195

$
3,245

Additions to capitalized exploratory well costs pending the determination of proved reserves
465

869

1,591

Reclassifications to wells, facilities and equipment based on the determination of proved reserves
(119
)
(164
)
(298
)
Capitalized exploratory well costs charged to expense
(118
)
(1,397
)
(312
)
Other reductions*
—

(191
)
(31
)
Ending balance at December 31
$
3,540

$
3,312

$
4,195

*    Represents property sales.
Aging of capitalized well costs and number of project
The following table provides an aging of capitalized well costs and the number of projects for which exploratory well costs have been capitalized for a period greater than one year since the completion of drilling.
 
At December 31
 
 
2016

2015

2014

Exploratory well costs capitalized for a period of one year or less
$
445

$
489

$
1,522

Exploratory well costs capitalized for a period greater than one year
3,095

2,823

2,673

Balance at December 31
$
3,540

$
3,312

$
4,195

Number of projects with exploratory well costs that have been capitalized for a period greater than one year*
35

39

51

*    Certain projects have multiple wells or fields or both.
Aging of Costs on Well and Project Basis
(a) $190 (two projects) – undergoing front-end engineering and design with final inve