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Asset Retirement Obligations - Schedule of ARO (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Asset Retirement Obligation  
Balance at beginning of period $ 51,622
Liabilities incurred 4,776
Liabilities settled (1,232)
Liabilities divested (187)
Accretion expense 2,489
Balance at end of period $ 57,468