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Asset Retirement Obligations
9 Months Ended
Sep. 30, 2021
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations ASSET RETIREMENT OBLIGATIONS
We are required to record the estimated fair value of the liabilities relating to the future retirement of our long-lived assets. Our oil and natural gas wells are plugged and abandoned when the oil and natural gas reserves in those wells are depleted or the wells are no longer able to produce. The plugging and abandonment liability for a well is recorded in the period in which the obligation is incurred (at the time the well is drilled or acquired). None of our assets are restricted for purposes of settling these AROs. All our AROs relate to the plugging costs associated with our oil and gas wells.

The following table shows certain information about our estimated AROs for the periods indicated (in thousands):

ARO liability, December 31, 2020 (Successor):$23,356 
Accretion of discount1,381 
Liability incurred
Liability settled(852)
Liability sold(1,925)
Revision of estimates (1)
4,408 
ARO liability, September 30, 2021 (Successor):26,372 
Less: current portion2,455 
Total long-term ARO$23,917 
_______________________ 
1.Plugging liability estimates were revised in 2021 for updates in the cost of services used to plug wells over the preceding year as well as estimated inflation and discount rates. We had various upward and downward adjustments.
ARO liability, December 31, 2019 (Predecessor)$66,627 
Accretion of discount1,545 
Liability incurred465 
Liability settled(838)
Liability sold(487)
Revision of estimates (1)
(28,328)
ARO liability, August 31, 2020 (Predecessor)38,984 
Fresh start adjustments(14,393)
ARO liability, August 31, 2020 (Successor)24,591 
Accretion of discount116 
Liability incurred141 
Liability settled(51)
Liability sold— 
Revision of estimates125 
ARO liability, September 30, 2020 (Successor)24,922 
Less current portion2,186 
Total long-term ARO$22,736 
_______________________ 
1.Plugging liability estimates were revised in 2020 for updates in the cost of services used to plug wells over the preceding year. We had various upward and downward adjustments.