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Property and Equipment (Tables)
9 Months Ended
Sep. 30, 2019
Property, Plant and Equipment [Abstract]  
Property and equipment
Property and equipment at September 30, 2019 and December 31, 2018 consisted of the following:
 
(Thousands
 of
 dollars)
 
September 30,
2019
  
December 31,
2018
 
Proved oil and gas properties, at cost
 $526,306  $514,821 
Less: Accumulated depletion and depreciation
  (314,717)  (291,152
  
 
 
  
 
 
 
Oil and Gas Properties, Net
 $211,589  $223,669 
  
 
 
  
 
 
 
Field and office equipment
 $27,533  $27,252 
Less: Accumulated depreciation
  (20,700)  (20,496
  
 
 
  
 
 
 
Field and Office Equipment, Net
 $6,833  $6,756 
  
 
 
  
 
 
 
Total Property and Equipment, Net
 $218,422  $230,425