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INCOME TAXES - Operating loss carryforward (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Oct. 01, 2019 | Oct. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2019 | Oct. 01, 2019 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
INCOME TAXES |  |  |  |  |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Predecessor |  |  |  | Successor | Predecessor | Predecessor | Successor | Successor | Predecessor |
Expiration of net operating losses | $ 454,200 |  | $ 891,500 |  |  | $ 454,200 |  |  |  | $ 891,500 |
Deferred tax expense |  |  | 95,800 |  |  | (95,791) |  | $ 0 |  | 95,791 |
Net operating loss carryforwards |  |  |  |  |  |  |  | 905,200 |  |  |
Net operating loss carryforward subject expiration in 2037 |  |  |  |  |  |  |  | $ 105,600 |  |  |
Carryforward period of NOLs that will expire in 2037 |  |  |  |  |  |  |  | 20 years |  |  |
Net operating carryforward not subject to expiration |  |  |  |  |  |  |  | $ 345,400 |  |  |
Valuation allowance |  |  |  | $ 478,690 | $ 478,690 |  |  | 489,539 | $ 478,690 |  |
Decrease in valuation allowance |  |  |  |  |  |  |  | 10,800 |  |  |
Unrecognized tax benefits | 0 | $ 0 | $ 0 | 0 | $ 0 | $ 0 | $ 0 | $ 0 | 0 | 0 | $ 0
Open tax year (in years) |  |  |  |  |  |  |  | 3 years |  |  |
Interest and penalties | $ 0 | $ 0 |  | $ 0 |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0

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