Quarterly report pursuant to Section 13 or 15(d)

CRUDE OIL AND NATURAL GAS PROPERTIES - Narrative (Details)

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CRUDE OIL AND NATURAL GAS PROPERTIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Asset Acquisition [Line Items]    
Impairment of its proved oil and gas properties $ 0.0 $ 0.0
Anticipated future period over which excluded costs will become subject to depletion 5 years  
Leases expired $ 0.2 1.7
Independent Transactions    
Asset Acquisition [Line Items]    
Consideration transferred 4.4 25.5
Development costs incurred prior to closing $ 1.8 $ 18.4