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OIL AND NATURAL GAS PROPERTIES (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2021
USD ($)
$ / bbl
$ / MMBTU
Dec. 31, 2020
USD ($)
$ / bbl
$ / MMBTU
Oil and Natural Gas Properties          
Subject to depletion $ 509,274     $ 569,886 $ 509,274
Other capital costs:          
Incurred in 2021       1,427  
Incurred in 2020 983     983 983
Incurred in 2019 74,511     61,895 74,511
Total not subject to depletion 75,494     64,305 75,494
Gross oil and natural gas properties 584,768     634,191 584,768
Less accumulated depletion (295,163)     (339,776) (295,163)
Net oil and natural gas properties 289,605     294,415 289,605
Ceiling Limitation Disclosures          
Depletion expense 60,500     $ 44,600 $ 60,500
First day average of the (WTI) crude oil spot price (in dollars per barrel) | $ / bbl       66.55 39.54
First day average of the Henry Hub natural gas price (in dollars per Mmbtu) | $ / MMBTU       3.60 1.99
Full cost ceiling impairment $ 26,700 $ 128,300 $ 60,100   $ 215,145
Unevaluated Oil and Gas Leaseholds          
Ceiling Limitation Disclosures          
Unevaluated property cost of area transferred to full cost pool   $ 23,600