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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Accounting Policies [Abstract]  
Inventory
Inventory consists of the following:
 
 
December 31,
 
2013
 
2012
 
(In thousands)
Equipment and materials
$
11,669

 
$
16,438

Crude oil inventory
8,983

 
4,269

 
$
20,652

 
$
20,707
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,
 
2013
 
2012
 
2011
 
(In thousands)
Beginning of period
$
40,424

 
$
20,207

 
$
5,176

Exploratory well cost additions (pending determination of proved reserves)
346,814

 
160,813

 
73,947

Exploratory well cost reclassifications (successful determination of proved reserves)
(264,023
)
 
(140,091
)
 
(57,646
)
Exploratory well dry hole costs (unsuccessful in adding proved reserves)
—

 
(505
)
 
(1,270
)
End of period
$
123,215

 
$
40,424

 
$
20,207