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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

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -URI http://asc.fasb.org/subtopic&trid=2145654 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 + Details
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