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Asset Retirement Obligations (Schedule Of Asset Retirement Obligations) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
ARO liability, Beginning Balance: $ 23,356 $ 66,627
Accretion of discount (931) (1,169)
Liability incurred 1 460
Liability settled (302) (435)
Liability sold (721) (463)
Revision of estimates [1] (93) (3,110)
ARO, Ending Balance: 23,172 64,248
Less: current portion 2,132 1,104
Total long-term ARO $ 21,040 $ 63,144
[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.