Quarterly report pursuant to Section 13 or 15(d)

Asset Retirement Obligations (Details)

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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Asset Retirement Obligations        
Asset retirement obligations - beginning of period     $ 34,610  
Obligations incurred for wells drilled and producing properties acquired     4,241  
Accretion expense $ 700 $ 649 1,390 $ 1,286
Asset retirement obligations - end of period $ 40,241   $ 40,241