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Other Long-Term Obligations and Commitments (Tables)
6 Months Ended
Jun. 30, 2020
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 June 30, 2020 is as follows:
 
(Thousands of dollars)
  
Operating
Leases
   
Financing
Leases
 
2021
  $106   $2 
2020
   309    4 
  
 
 
   
 
 
 
Total undiscounted lease payments
  $415   $6 
Less: Amount associated with discounting
   (35   (1
  
 
 
   
 
 
 
Net operating lease liabilities
  $380   $5 
  
 
 
   
 
 
 
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, 2020 is as follows:
 
(Thousands of dollars)
  
June 30,
2020
 
Asset retirement obligation at December 31, 2019
  $21,118 
Liabilities settled
   (1,053
Accretion expense
   502 
  
 
 
 
Asset retirement obligation at June 30, 2020
  $20,567