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Property and Equipment (Tables)
9 Months Ended
Sep. 30, 2020
Property, Plant and Equipment [Abstract]  
Property and equipment
Property and equipment at September 30, 2020 and December 31, 2019 consisted of the following:
 
(Thousands of dollars)
  
September 30,

2020
   
December 31,

2019
 
Proved oil and gas properties, at cost
  $500,888   $527,729 
Less: Accumulated depletion and depreciation
   (309,396   (322,409
    
 
 
 
Oil and Gas Properties, Net
  $191,492   $205,320 
    
 
 
 
Field and office equipment
  $28,254   $27,542 
Less: Accumulated depreciation
   (21,827   (20,762
    
 
 
 
Field and Office Equipment, Net
  $6,427   $6,780 
    
 
 
 
Total Property and Equipment, Net
  $197,919   $212,100