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OIL AND NATURAL GAS PROPERTIES (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($) $ / bbl $ / MMBTU	Jun. 30, 2020 USD ($) $ / bbl $ / MMBTU	Jun. 30, 2021 USD ($) $ / bbl $ / MMBTU	Dec. 31, 2020 USD ($)	Mar. 31, 2020 $ / bbl
OIL AND NATURAL GAS PROPERTIES
Subject to depletion			$ 544,418	$ 509,274
Not subject to depletion:
Total not subject to depletion			75,822	75,494
Gross oil and natural gas properties			620,240	584,768
Less accumulated depletion			(316,519)	(295,163)
Net oil and natural gas properties			$ 303,721	$ 289,605
Ceiling Limitation Disclosures
First-day-of-month 12-month average price for natural gas (in $/MMBtu) | $ / MMBTU	2.07	2.07	2.43
Full cost ceiling impairment	$ 60,107	$ 60,107
First-day-of-month 12-month average price for crude oil used in ceiling test impairment (in dollars per barrel) | $ / bbl	47.37	47.37	49.72		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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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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