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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Inventory
Inventory consists of the following:
 
 
December 31,
 
2015
 
2014
 
(In thousands)
Equipment and materials
$
4,920

 
$
14,225

Crude oil inventory
6,152

 
7,129

Total inventory
$
11,072

 
$
21,354
Net Changes in Capitalized Exploratory Well Costs
Net changes in capitalized exploratory well costs are reflected in the following table for the periods presented:
 
 
December 31,
 
2015
 
2014
 
2013
 
(In thousands)
Beginning of period
$
34,522

 
$
123,215

 
$
40,424

Exploratory well cost additions (pending determination of proved reserves)
51,995

 
336,344

 
346,814

Exploratory well cost reclassifications (successful determination of proved reserves)
(84,228
)
 
(425,037
)
 
(264,023
)
Exploratory well dry hole costs (unsuccessful in adding proved reserves)
—

 
—

 
—

End of period
$
2,289

 
$
34,522

 
$
123,215