Annual report pursuant to Section 13 and 15(d)

SUPPLEMENTAL OIL AND GAS INFORMATION (UNAUDITED) - Costs Incurred (Details)

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SUPPLEMENTAL OIL AND GAS INFORMATION (UNAUDITED) - Costs Incurred (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Extractive Industries [Abstract]      
Proved Property Acquisition and Other $ 50,345 $ 375,145 $ 582,697
Unproved Property Acquisition 770 9,540 4,903
Development 162,797 369,233 260,945
Total $ 213,912 $ 753,918 $ 848,545