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Oil and Gas Properties and Equipment, net (Tables)
 12 Months Ended
Dec. 31, 2015
Oil and Gas Properties [Abstract]  
Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure [Table Text Block]
Net capitalized costs, utilizing the successful efforts method of accounting, related to our oil and gas producing activities are as follows:
 
At Year-End
 
2015
 
2014
 
(In thousands)
Unproved leasehold interests
$
19,441

 
$
90,446

Proved oil and gas properties
119,414

 
221,299

Total costs
138,855

 
311,745

Less accumulated depreciation, depletion and amortization
(58,242
)
 
(48,252
)
 
$
80,613

 
$
263,493