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Other Long-Term Obligations and Commitments (Tables)
3 Months Ended
Mar. 31, 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 March 31, 2020 is as follows:
 
(Thousands of dollars)
  
Operating
Leases
   
Financing
Leases
 
2020
  $464   $6 
2021
   106    2 
  
 
 
   
 
 
 
Total undiscounted lease payments
  $570   $8 
Less: Amount associated with discounting
   (45   (1
  
 
 
   
 
 
 
Net operating lease liabilities
  $525   $7 
  
 
 
   
 
 
 
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, 2020 is as follows:
 
(Thousands of dollars)
  
March 31,
2020
 
Asset retirement obligation at December 31, 201
9
  $21,118 
Liabilities settled
   (281
Accretion expense
   251 
  
 
 
 
Asset retirement obligation at March 31, 2020
  $21,088