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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Asset retirement obligations, beginning of period $ 13,524 $ 8,630
Additional liabilities incurred 434 4,480
Dispositions (194) 0
Accretion expense 800 638
Liabilities settled upon plugging and abandoning wells (7) (441)
Revision of estimates (126) 217
Asset retirement obligations, end of period $ 14,431 $ 13,524