Quarterly report pursuant to Section 13 or 15(d)

Asset Retirement Obligations - Summary (Details)

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Asset Retirement Obligations - Summary (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Asset retirement obligations, beginning of period $ 8,630  
Additional liabilities incurred 4,367  
Dispositions 0  
Accretion expense 442  
Liabilities settled upon plugging and abandoning wells (551)  
Revision of estimates 207  
Asset retirement obligations, end of period 13,095  
Less: current portion of asset retirement obligations (58)  
Long-term asset retirement obligations $ 13,037 $ 8,522