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Acquisitions and divestiture (Tables)
 9 Months Ended
Sep. 30, 2020
Business Combinations [Abstract]  
Schedule of final estimate of the fair values of the assets acquired and liabilities assumed
The following table reflects an aggregate of the final estimate of the fair values of the assets acquired and liabilities assumed in this business combination on December 6, 2019:
(in thousands)Fair values of acquisition
Fair values of net assets:
Evaluated oil and natural gas properties$29,921 
Unevaluated oil and natural gas properties34,700 
Asset retirement cost2,728 
     Total assets acquired67,349 
Asset retirement obligations(2,728)
        Net assets acquired$64,621 
Fair values of consideration paid for net assets:
Cash consideration$64,621