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Commitments (Tables)
 12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Summary of Operating and Financing Lease Obligation
The payment schedule for the Company’s operating and financing lease obligations as of December 31, 2019 is as follows:
 
(Thousands
 of
  dollars)
  
Operating
Leases
   
Financing
Leases
 
2020
  
$
616   
$
8 
2021
   106    2 
  
 
 
   
 
 
 
Total undiscounted lease payments
  $722   $10 
Less: Amount associated with discounting
   (53)    (1) 
  
 
 
   
 
 
 
Net operating lease liabilities
  $669   $9 
  
 
 
   
 
 
 
Reconciliation of Liability for Plugging and Abandonment Costs
A reconciliation of the liability for plugging and abandonment costs for the years ended December 31, 2019 and 2018 is as follows:
 
   
Year Ended December 31,
 
(Thousands
 of
  dollars)
  
    2019    
   
    2018    
 
Asset retirement obligation at beginning of period
  $21,334   $23,578 
Liabilities incurred
   4    49 
Liabilities settled
   (1,442)    (2,656) 
Accretion expense
   1,120    1,120 
Revisions in estimated liabilities
   102    (757) 
  
 
 
   
 
 
 
Asset retirement obligation at end of period
  $21,118   $21,334