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OIL AND NATURAL GAS PROPERTIES (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
$ / MMBTU
$ / bbl
Dec. 31, 2020
USD ($)
Mar. 31, 2020
$ / MMBTU
$ / bbl
OIL AND NATURAL GAS PROPERTIES      
Subject to depletion $ 530,499 $ 509,274  
Not subject to depletion:      
Total not subject to depletion 75,880 75,494  
Gross oil and natural gas properties 606,379 584,768  
Less accumulated depletion (305,505) (295,163)  
Net oil and natural gas properties $ 300,874 $ 289,605  
Ceiling Limitation Disclosures      
First-day-of-month 12-month average price for natural gas (in $/MMBtu) | $ / MMBTU 2.16   2.30
First-day-of-month 12-month average price for crude oil used in ceiling test impairment (in dollars per barrel) | $ / bbl 39.95   55.96