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Other Long-Term Obligations and Commitments (Tables)
 6 Months Ended
Jun. 30, 2023
Debt Disclosure [Abstract]  
Summary of Operating and Financing Lease Obligation
The payment schedule for the Company’s operating lease obligations as of June 30, 2023 is as follows:
 
(Thousands of dollars)
   
Operating
Leases
  
2023
    $ 374  
2024
      275  
2025
      45  
    
 
 
  
Total undiscounted lease payments
    $ 694  
Less: Amount associated with discounting
      (58 ) 
    
 
 
  
Total net operating lease liabilities
    $ 636  
Less: Current portion included in current portion of asset retirement and other long-term obligations
      520  
    
 
 
  
Non-current
portion included in other long-term obligations
    $ 116  
    
 
 
  
Reconciliation of Liability for Plugging and Abandonment Costs
A reconciliation of the liability for plugging and abandonment costs for the six months ended June 30, 2023 is as follows:
 
(Thousands of dollars)
   
June 30,
2023
  
Asset retirement obligation at December 31, 2022
    $ 15,443  
Additions
      16  
Liabilities settled
      (970 ) 
Accretion of discount
      367  
    
 
 
  
Asset retirement obligation at June 30, 2023
    $ 14,856  
Less current portion of asset retirement obligations
      1,101  
    
 
 
  
Asset retirement obligations, long-term
    $ 13,755