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OIL AND NATURAL GAS PROPERTIES (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) $ / bbl $ / MMBTU	Jun. 30, 2020 USD ($) $ / bbl	Sep. 30, 2020 USD ($) $ / bbl $ / MMBTU	Sep. 30, 2021 USD ($) $ / MMBTU $ / bbl	Dec. 31, 2020 USD ($)	Mar. 31, 2020 $ / bbl
OIL AND NATURAL GAS PROPERTIES
Subject to depletion				$ 550,522	$ 509,274
Not subject to depletion:
Total not subject to depletion				76,136	75,494
Gross oil and natural gas properties				626,658	584,768
Less accumulated depletion				(327,233)	(295,163)
Net oil and natural gas properties				$ 299,425	$ 289,605
Ceiling Limitation Disclosures
First-day-of-month 12-month average price for natural gas (in $/MMBtu) | $ / MMBTU	1.97		1.97	2.94
Amount of unevaluated property costs transferred to the full cost pool			$ 23,600
Full cost ceiling impairment	$ 128,336	$ 60,100	$ 188,443
First-day-of-month 12-month average price for crude oil used in ceiling test impairment (in dollars per barrel) | $ / bbl	43.63	47.37	43.63	57.64		55.96

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The natural gas price per million MMBtu.

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Amount of accumulated depletion, and impairment of oil and gas property carried under the full cost method.

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Represents the amount of unevaluated property costs transferred to the full cost pool.

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The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs.

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Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

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The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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Oil and gas properties, gross, carried under the full cost method.

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