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Asset Retirement Obligations (AROs) - Change in Asset Retirement Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning Balance $ 23,821 $ 12,656
New Obligations Recognized 0 8,062
Adjustments Due to Revisions in Cash Flow Estimates (568) 3,110
Accrued Accretion 938 570
Settlements 0 (577)
Ending Balance $ 24,191 $ 23,821