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OIL AND NATURAL GAS PROPERTIES (Details) $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2019 | Dec. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) $ / MMBTU $ / bbl | Jun. 30, 2019 USD ($) $ / MMBTU $ / bbl | Mar. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) $ / MMBTU $ / bbl | Jun. 30, 2019 USD ($) $ / MMBTU $ / bbl | Dec. 31, 2019 USD ($) | Mar. 31, 2020 $ / bbl | Oct. 02, 2019 USD ($) | Oct. 01, 2019 USD ($)
Oil and Natural Gas Properties |  |  |  |  |  |  |  |  |  |  |
Subject to depletion |  | $ 420,609 | $ 496,489 |  |  | $ 496,489 |  | $ 420,609 |  | $ 380,364 |
Not subject to depletion: |  |  |  |  |  |  |  |  |  |  |
Total not subject to depletion |  | 105,009 | 104,408 |  |  | 104,408 |  | 105,009 |  | 108,954 |
Gross oil and natural gas properties |  | 525,618 | 600,897 |  |  | 600,897 |  | 525,618 |  | 489,318 |
Less accumulated depletion |  | (19,474) | (111,188) |  |  | (111,188) |  | (19,474) |  |  |
Net oil and natural gas properties |  | $ 506,144 | $ 489,709 |  |  | $ 489,709 |  | $ 506,144 |  | $ 489,318 |
Ceiling Limitation Disclosures |  |  |  |  |  |  |  |  |  |  |
Oil And Natural Gas, Evaluated Properties, Fair Value Disclosure |  |  |  |  |  |  |  |  |  |  | $ 380,400
Oil And Natural Gas, Unevaluated Properties, Fair Value Disclosure |  |  |  |  |  |  |  |  |  |  | 109,000
First-day-of-month 12-month average price for natural gas (in $/MMBtu) | $ / MMBTU |  |  | 2.070 | 3.02 |  | 2.070 | 3.02 |  |  |  |
Amount of unevaluated property costs transferred to the full cost pool |  |  |  |  | $ 51,000 |  | $ 481,700 |  |  |  |
Full cost ceiling impairment |  |  | $ 60,107 | $ 664,383 | $ 275,200 | $ 60,107 | $ 939,622 |  |  |  |
First-day-of-month 12-month average price for crude oil used in ceiling test impairment (in dollars per barrel) | $ / bbl |  |  | 47.37 | 61.45 |  | 47.37 | 61.45 |  | 55.96 |  |
Financial Designation, Predecessor and Successor [Fixed List] | Successor | Successor | Successor | Predecessor |  | Successor | Predecessor | Successor |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |
Oil and Natural Gas Properties |  |  |  |  |  |  |  |  |  |  |
Subject to depletion |  |  |  |  |  |  |  |  |  |  | 2,155,288
Not subject to depletion: |  |  |  |  |  |  |  |  |  |  |
Total not subject to depletion |  |  |  |  |  |  |  |  |  |  | 438,365
Gross oil and natural gas properties |  |  |  |  |  |  |  |  |  |  | 2,593,653
Less accumulated depletion |  |  |  |  |  |  |  |  |  |  | (1,709,719)
Net oil and natural gas properties |  |  |  |  |  |  |  |  |  |  | $ 883,934

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