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OIL AND NATURAL GAS PROPERTIES (Details) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 01, 2019 USD ($) | Jul. 10, 2017 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Oct. 01, 2019 USD ($) | Sep. 30, 2019 | Dec. 31, 2020 USD ($) $ / MMBTU $ / bbl | Dec. 31, 2019 USD ($) $ / MMBTU $ / bbl | Dec. 31, 2018 USD ($) $ / MMBTU $ / bbl | Dec. 31, 2017 USD ($) | Oct. 02, 2019 USD ($)
Oil and Natural Gas Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subject to depletion | $ 2,155,288 |  | $ 509,274 |  |  | $ 420,609 |  |  |  | $ 2,155,288 |  | $ 509,274 | $ 420,609 |  |  | $ 380,364
Other capital costs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incurred in 2020 |  |  | 983 |  |  |  |  |  |  |  |  | 983 |  |  |  |
Incurred in 2019 |  |  | 74,511 |  |  | 105,009 |  |  |  |  |  | 74,511 | 105,009 |  |  |
Total not subject to depletion | 438,365 |  | 75,494 |  |  | 105,009 |  |  |  | 438,365 |  | 75,494 | 105,009 |  |  | 108,954
Gross oil and natural gas properties | 2,593,653 |  | 584,768 |  |  | 525,618 |  |  |  | 2,593,653 |  | 584,768 | 525,618 |  |  | 489,318
Less accumulated depletion | (1,709,719) |  | (295,163) |  |  | (19,474) |  |  |  | (1,709,719) |  | (295,163) | (19,474) |  |  |
Net oil and natural gas properties | 883,934 |  | 289,605 |  |  | 506,144 |  |  |  | 883,934 |  | 289,605 | 506,144 |  |  | $ 489,318
Ceiling Limitation Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depletion expense | 84,600 |  | 60,500 |  |  | $ 19,500 |  |  |  | 84,600 |  | $ 60,500 | $ 19,500 |  |  |
Oil And Natural Gas, Evaluated Properties, Fair Value Disclosure | 380,400 |  |  |  |  |  |  |  |  | 380,400 |  |  |  |  |  |
Oil And Natural Gas, Unevaluated Properties, Fair Value Disclosure | $ 109,000 |  |  |  |  |  |  |  |  | 109,000 |  |  |  |  |  |
First day average of the (WTI) crude oil spot price (in dollars per barrel) | $ / bbl |  |  |  |  |  |  |  |  |  |  |  | 39.54 | 55.85 | 65.56 |  |
First day average of the Henry Hub natural gas price (in dollars per Mmbtu) | $ / MMBTU |  |  |  |  |  |  |  |  |  |  |  | 1.990 | 2.580 | 3.100 |  |
Gain (loss) from sale of other operating property and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (7,235) |  |
Full cost ceiling impairment |  |  | $ 26,700 | $ 128,300 | $ 60,100 |  | $ 45,600 | $ 664,400 | $ 275,200 | $ 985,190 |  | $ 215,145 |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Predecessor |  |  |  |  | Successor |  |  |  | Predecessor | Predecessor | Successor | Successor | Predecessor |  |
Williston Basin Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ceiling Limitation Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from sale of other operating property and equipment |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  | $ (7,200) | $ 485,900 |
Unevaluated Oil and Gas Leaseholds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ceiling Limitation Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unevaluated property cost of area transferred to full cost pool |  |  |  | $ 23,600 |  |  |  |  |  |  |  |  |  |  |  |
Hackberry Draw Area [Member] | Unevaluated Oil and Gas Leaseholds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ceiling Limitation Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unevaluated property cost of area transferred to full cost pool |  |  |  |  |  |  |  | $ 481,700 | $ 51,000 |  |  |  |  |  |  |

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