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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Schedule Of Asset Retirement Obligations [Table Text Block]
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 discount467 
Liability incurred151 
Liability settled(95)
Liability sold— 
Revision of estimates (1)
(1,758)
ARO liability, December 31, 2020 (Successor)23,356 
Less current portion (Successor)2,121 
Total long-term ARO (Successor)$21,235 
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1.Plugging liability estimates were revised in 2019 and 2020 for updates in the cost of services used to plug wells over the preceding year and estimated dates to be plugged.