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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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- 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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