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OIL AND GAS PRODUCING ACTIVITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Unevaluated properties:    
Unproved leasehold costs $ 5,664 $ 10,188
Exploratory wells in progress 2,357
Evaluated properties in full cost pool $ 97,912 147,486
Less accumulated depreciation, depletion and amortization (80,144) (71,762)
Net capitalized costs $ 23,432 $ 88,269