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OIL AND NATURAL GAS PROPERTIES - Acquisitions (Details) - Mineral And Royalty Acreage In Northern Midland Basin - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Business Acquisition [Line Items]    
Total consideration $ 20.8  
Purchase price, cash 10.0  
Common unit consideration for acquisition 10.8  
Proved oil and natural gas properties 4.9  
Unproved oil and natural gas properties 15.6  
Net working capital 0.3  
Acquisition-related costs $ 0.3 $ 0.3