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Oil and Gas Properties (Tables)
 3 Months Ended
Mar. 31, 2016
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:
 
First
Quarter-End
 
Year-End
 
2016
 
2015
 
(In thousands)
Unproved leasehold interests
$
11,453

 
$
19,441

Proved oil and gas properties
75,673

 
119,414

Total costs
87,126

 
138,855

Less: accumulated depreciation, depletion and amortization
(44,746
)
 
(58,242
)
 
$
42,380

 
$
80,613