Annual report pursuant to Section 13 and 15(d)

Asset Retirement Obligations (Details)

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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 at beginning of period $ 14,292 $ 6,020
Accretion expense 945 874
Liabilities incurred 615 973
Increase due to acquisition of oil and gas properties 26,107 570
Liabilities settled (3,394) (1,288)
Dispositions (1,776) (614)
Revisions to estimates 12,944 7,757
Asset retirement obligations, end of period 49,733 14,292
Less: Current asset retirement obligations (873) (3,887)
Long-term asset retirement obligations 48,860 10,405
Restricted Investments    
Restricted investments $ 3,500 $ 3,400