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Asset Retirement Obligations (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Asset Retirement Obligations [Abstract]    
Additions $ 14,564 $ 359
Revisions 7,169 $ 238
Costs associated with retirement obligation, included in accrued liabilities $ 6,700