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Other Long-Term Obligations and Commitments (Tables)
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Summary of Operating and Financing Lease Obligation
The payment schedule for the Company’s operating lease obligations as of September 30, 2023 is as follows:
 
(Thousands of dollars)
   
Operating
Leases
  
2023
    $ 187  
2024
      275  
2025
      45  
  
 
 
  
Total undiscounted lease payments
    $ 507  
Less: Amount associated with discounting
      (49 ) 
  
 
 
  
Total net operating lease liabilities
    $ 458  
Less: Current portion included in current portion of asset retirement and other long-term obligations
      381  
  
 
 
  
Non-current
portion included in other long-term obligations
    $ 77  
  
 
 
  
Reconciliation of Liability for Plugging and Abandonment Costs
A reconciliation of the liability for plugging and abandonment costs for the nine months ended September 30, 2023 is as follows:
 
(Thousands of dollars)
   
September 30,
2023
  
Asset retirement obligation at December 31, 2022
    $ 15,443  
Additions
      16  
Dispositions
      (1,161 ) 
Liabilities settled
      (2,727 ) 
Accretion of discount
      550  
  
 
 
  
Asset retirement obligation at September 30, 2023
    $ 12,121  
Less current portion of asset retirement obligations
      554  
  
 
 
  
Asset retirement obligations, long-term
      11,567