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Other Long-Term Obligations and Commitments (Tables)
3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Summary of Future Minimum Lease Payments for Non-Cancelable Operating Leases
The payment schedule for the Company’s operating and financing lease obligations as of March 31, 2021 is as follows:
 
(Thousands of dollars)
  
Operating
Leases
   
Financing
Leases
 
202
1
  $449   $1 
202
2
   157    
 
 
 
2023
   17    —   
   
 
 
   
 
 
 
Total undiscounted lease payments
  $623   $1 
Less: Amount associated with discounting
   (23   
 
 
 
   
 
 
   
 
 
 
Net operating lease liabilities
  $600   $1 
   
 
 
   
 
 
 
Reconciliation of Liability for Plugging and Abandonment Costs
A reconciliation of the liability for plugging and abandonment costs for the three months ended March 31, 2021 is as follows:
 
(Thousands of dollars)
  
March 31,
2021
 
Asset retirement obligation at December 31, 2020
  $13,660 
Liabilities incurred
 
 
12
 
Liabilities settled
   
(40
)
 
Accretion expense
   153 
   
 
 
 
Asset retirement obligation at March 31, 2021
  $13,785