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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 ($) | Jul. 10, 2017 USD ($) | Jan. 24, 2017 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, 2019 USD ($) $ / MMBTU $ / bbl | Dec. 31, 2018 USD ($) $ / MMBTU $ / bbl | Dec. 31, 2017 USD ($) $ / MMBTU $ / bbl | Oct. 02, 2019 USD ($)
Oil and Natural Gas Properties |  |  |  |  |  |  |  |  |  |  |  |  |
Subject to depletion | $ 2,155,288 |  |  | $ 420,609 |  |  |  | $ 2,155,288 |  | $ 420,609 | $ 1,470,509 |  | $ 380,364
Not subject to depletion: |  |  |  |  |  |  |  |  |  |  |  |  |
Exploration and extension wells in progress |  |  |  |  |  |  |  |  |  |  | 23,536 |  |
Other capital costs: |  |  |  |  |  |  |  |  |  |  |  |  |
Incurred in 2019 |  |  |  | 105,009 |  |  |  |  |  | 105,009 |  |  |
Incurred in 2018 |  |  |  |  |  |  |  |  |  |  | 310,113 |  |
Incurred in 2017 |  |  |  |  |  |  |  |  |  |  | 638,269 |  |
Total not subject to depletion | 438,365 |  |  | 105,009 |  |  |  | 438,365 |  | 105,009 | 971,918 |  | 108,954
Gross oil and natural gas properties | 2,593,653 |  |  | 525,618 |  |  |  | 2,593,653 |  | 525,618 | 2,442,427 |  | 489,318
Less accumulated depletion | (1,709,719) |  |  | (19,474) |  |  |  | (1,709,719) |  | (19,474) | (639,951) |  |
Net oil and natural gas properties | 883,934 |  |  | $ 506,144 |  |  |  | 883,934 |  | $ 506,144 | $ 1,802,476 |  | $ 489,318
Ceiling Limitation Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | 55.85 | 65.56 | 51.34 |
First day average of the Henry Hub natural gas price (in dollars per Mmbtu) | $ / MMBTU |  |  |  |  |  |  |  |  |  | 2.578 | 3.100 | 2.976 |
Amount of unevaluated property costs transferred to the full cost pool |  |  |  |  |  |  | $ 51,000 |  |  |  |  |  |
Gain (loss) from sale of other operating property and equipment |  |  |  |  |  |  |  |  |  |  | $ (7,235) | $ 721,573 |
Impairment of Oil and Gas Properties |  |  |  |  | $ 45,600 | $ 664,400 | $ 275,200 | $ 985,190 |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Predecessor |  |  | Successor |  |  |  | Predecessor | Predecessor |  | Predecessor | Predecessor |
Williston Basin Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Ceiling Limitation Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from sale of other operating property and equipment |  | $ 0 |  |  |  |  |  |  |  |  | $ (7,200) | $ 485,900 |
El Halcon Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Ceiling Limitation Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from sale of other operating property and equipment |  |  | $ 0 |  |  |  |  |  |  |  |  | $ 235,700 |
Utica areas | Unevaluated Oil and Gas Leaseholds |  |  |  |  |  |  |  |  |  |  |  |  |
Ceiling Limitation Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of unevaluated property costs transferred to the full cost pool |  |  |  |  |  | $ 481,700 |  |  |  |  |  |  |

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