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Oil and Gas Properties (Tables)
 9 Months Ended
Sep. 30, 2015
Extractive Industries [Abstract]  
Net Capitalized Costs Related to Oil and Gas Producing Activities
Net capitalized costs, utilizing the successful efforts method of accounting, related to our oil and gas producing activities follows:
 
Third
Quarter-End
 
Year-End
 
2015
 
2014
 
(In thousands)
Unproved leasehold interests
$
44,387

 
$
90,446

Proved oil and gas properties
133,246

 
221,299

Total costs
177,633

 
311,745

Less: accumulated depreciation, depletion and amortization
(55,858
)
 
(48,252
)
 
$
121,775

 
$
263,493