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Asset Retirement Obligations Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]      
Asset Retirement Obligation $ 6,050 $ 4,974 $ 4,447
Accretion expense 306 354  
Liabilities incurred for new wells and facilities construction 1,120 281  
Asset Retirement Obligation, Liabilities Plugged (192) (103)  
Revisions in estimates (158) (5)  
Asset retirement obligation - current portion $ 524 $ 441