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Asset Retirement Obligations (Tables)
9 Months Ended
Sep. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Asset Retirement Obligations The following table shows certain information about our estimated AROs for the periods indicated (in thousands):
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 and estimated dates to be plugged.

The following table shows certain information about our estimated AROs for the periods indicated (in thousands):
ARO liability, December 31, 2018 (Predecessor)$64,208 
Accretion of discount1,770 
Liability incurred4,325 
Liability settled(2,805)
Liability sold(1,721)
Revision of estimates (1)
(1,705)
ARO liability, September 30, 2019 (Predecessor)64,072 
Less current portion3,033 
Total long-term ARO$61,039 
_______________________ 
1.Plugging liability estimates were revised in 2019 for updates in the cost of services used to plug wells over the preceding year. We had various upward and downward adjustments.