Annual report pursuant to Section 13 and 15(d)

Supplemental Information on Oil and Natural Gas Properties (Unaudited) (Capitalized Costs) (Details)

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Supplemental Information on Oil and Natural Gas Properties (Unaudited) (Capitalized Costs) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Oil and Gas Exploration and Production Industries Disclosures [Abstract]    
Evaluated properties $ 7,894,513 $ 7,203,482
Unevaluated properties 1,733,250 1,986,124
Total oil and natural gas properties 9,627,763 9,189,606
Less accumulated depreciation, depletion, amortization and impairment (5,538,803) (2,520,488)
Total oil and natural gas properties, net $ 4,088,960 $ 6,669,118