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Property and Equipment (Tables)
6 Months Ended
Jun. 30, 2019
Property, Plant and Equipment [Abstract]  
Property and equipment
Property and equipment at June 30, 2019 and December 31, 2018 consisted of the following:
 
(Thousands of dollars)
 
June 30,
2019
  
December 31,
2018
 
Proved oil and gas properties, at cost
 $522,239  $514,821 
Less: Accumulated depletion and depreciation
  (306,116  (291,152
  
 
 
  
 
 
 
 Oil and Gas Properties, Net
 $216,123  $223,669 
  
 
 
  
 
 
 
Field and office equipment
 $28,188  $27,252 
Less: Accumulated depreciation
  (21,283  (20,496
  
 
 
  
 
 
 
 Field and Office Equipment, Net
 $6,905  $6,756 
  
 
 
  
 
 
 
Total Property and Equipment, Net
 $223,028  $230,425