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Commitments (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020 is as follows:
 
(Thousands of dollars)
  
Operating

Leases
   
Financing

Leases
 
2021
  
$

106   
$
2 
   
 
 
   
 
 
 
Total undiscounted lease payments
  $106   $2 
Less: Amount associated with discounting
   (10)    (0) 
   
 
 
   
 
 
 
Net operating lease liabilities
  $96   $2 
   
 
 
   
 
 
 
Reconciliation of Liability for Plugging and Abandonment Costs
A reconciliation of the liability for plugging and abandonment costs for the years ended December 31, 2020 and 2019 is as follows:
 
   
Year Ended December 31,
 
(Thousands of dollars)
  
2020
   
2019
 
Asset retirement obligation at beginning of period
  $21,118   $21,334 
Liabilities incurred
   4    4 
Liabilities settled
   (1,286)    (1,442) 
Liabilities divested
 
 
(5,731
)
 
 
—  
 
Accretion expense
   856    1,120 
Revisions in estimated liabilities
   (1,301)    102 
   
 
 
   
 
 
 
Asset retirement obligation at end of period
  $13,660   $21,118