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OIL AND NATURAL GAS PROPERTIES - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2020
USD ($)
a
Aug. 16, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
a
Sep. 30, 2019
USD ($)
Extractive Industries [Abstract]            
Purchase and sale agreement, number of undeveloped net acres sold (in acres) | a 1,185          
Proceeds from sale of land held-for-investment $ 24.1 $ 16.6        
Unproved oil and gas property transferred to prove undeveloped         $ 27.9 $ 15.3
Lessee, operating lease, area of real estate property, expired, previously impaired | a         1,285  
Depreciation, depletion, amortization and accretion     $ 4.2 $ 5.4 $ 9.7 22.8
Results of Operations, Impairment of Oil and Gas Properties     $ 62.2 $ 16.6 $ 94.9 $ 16.6