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Oil and Natural Gas Producing Activities (Tables)
 12 Months Ended
Dec. 31, 2018
Oil and Gas Property [Abstract]  
Schedule of Costs Incurred in Purchase of Proved and Unproved Properties, and Exploration and Development Activities

The following table presents the Company’s capitalized costs associated with oil and natural gas producing activities as of December 31, 2018 and 2017:

 

   2018   2017 
   (in thousands) 
Oil and Natural Gas Properties:          
Unevaluated properties:          
Unproved leasehold costs  $3,728   $4,664 
Evaluated properties in full cost pool   88,764    86,313 
Less accumulated depreciation, depletion and amortization   (83,729)   (83,362)
           
Net capitalized costs  $8,763   $7,615 
Schedule of Operations from Oil and Gas Producing Activities

Presented below are the results of operations from oil and natural gas producing activities for the years ended December 31, 2018 and 2017:

 

   2018   2017 
   (in thousands) 
Oil and natural gas sales  $5,539   $6,545 
Lease operating expense   (1,898)   (2,903)
Production taxes   (392)   (499)
Depreciation, depletion accretion and amortization   (393)   (753)
Impairment of oil and natural gas properties   -    - 
           
Results of operations from oil and natural gas producing activities  $2,856   $2,390