Annual report pursuant to Section 13 and 15(d)

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

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Supplemental Information on Oil and Natural Gas Properties (Unaudited) (Costs Incurred) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Acquisition costs:      
Evaluated properties $ 0 $ 49,572 $ 347,305
Unevaluated properties 30,696 107,347 466,816
Development costs 379,900 189,259 259,410
Exploration costs 122,865 309,013 323,458
Total costs incurred $ 533,461 $ 655,191 $ 1,396,989