Annual report pursuant to Section 13 and 15(d)

Acquisitions and Divestitures - Purchase Price Allocation (Details)

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Acquisitions and Divestitures - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Aug. 31, 2019
Mobile Bay Properties [Member]    
Oil and natural gas properties and other, net - at cost:   $ 192,373
Other assets   4,838
Current liabilities   1,559
Asset retirement obligations   21,684
Other liabilities   $ 4,132
Magnolia Field Acquisition [Member]    
Oil and natural gas properties and other, net - at cost: $ 23,791  
Asset retirement obligations $ 7,842