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Property and Equipment (Tables)
6 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
Property and equipment
Property and equipment at June 30, 2021 and December 31, 2020 consisted of the following:
 
(Thousands of dollars)
  
June 30,
2021
    
December 31,
2020
 
Proved oil and gas properties, at cost
   $ 524,350      $ 520,488  
Less: Accumulated depletion and depreciation
     (347,857      (335,390
    
 
 
    
 
 
 
Oil and Gas Properties, Net
   $ 176,493      $ 185,098  
    
 
 
    
 
 
 
Field and office equipment
   $ 27,011      $ 26,797  
Less: Accumulated depreciation
     (21,110      (20,842
    
 
 
    
 
 
 
Field and Office Equipment, Net
   $ 5,901      $ 5,955  
    
 
 
    
 
 
 
Total Property and Equipment, Net
   $ 182,394      $ 191,053