| **INCOME TAXES Additional Information (Details) - USD ($) $ in Thousands** | 3 Months Ended | 12 Months Ended |
|----------------------------------------------------------------------------|----------------|-----------------|
||
| **Operating Loss Carryforwards:**                                          |           |            |   |   |
| Combined federal and state deferred tax rate                               |           |            | 23.90% |   |
| Deferred Tax Liabilities, Property, Plant and Equipment                    | $ 267,498      | $ 270,565       | $ 267,498 |   |
| Federal tax reform rate reduction                                          |           | 0.00%           | 33.70% | 0.00% |
| Effective Income Tax Rate Reconciliation, Percent                          |           | 72.80%          | 62.40% | 37.40% |
| Net deferred tax liability                                                 | 191,992        | $ 198,096       | $ 191,992 |   |
| Income Tax Expense (Benefit)                                               |           | 6,105           | (203,685) | $ (137,249) |
| Deferred Tax Assets, Operating Loss Carryforwards                          |           | 169,100         |   |   |
| Deferred tax asset, operating loss carryforward, annual limitation         |           | 15,100          |   |   |
| Operating Loss Carryforwards                                               | 31,500         |            | 31,500 |   |
| Alternative minimum tax - credit carryforward                              | 4,366          | 7,756           | $ 4,366 |   |
| Gas Well Credit [Member]                                                   |           |            |   |   |
| **Operating Loss Carryforwards:**                                          |           |            |   |   |
| Tax Credit Carryforward, Amount                                            |           | 5,100           |   |   |
| amt tax credit [Member]                                                    |           |            |   |   |
| **Operating Loss Carryforwards:**                                          |           |            |   |   |
| Alternative minimum tax - credit carryforward                              |           | 2,700           |   |   |
| State NOL Carryforwards                                                    |           |            |   |   |
| **Operating Loss Carryforwards:**                                          |           |            |   |   |
| State NOL carryforwards                                                    |           | $ 284,600       |   |   |
| Year Carryforwards Expire                                                  |           | Dec. 31,  2030  |   |   |
| State Credit Carryforwards                                                 |           |            |   |   |
| **Operating Loss Carryforwards:**                                          |           |            |   |   |
| State credit carryforwards                                                 |           | $ 3,300         |   |   |
| Year Carryforwards Expire                                                  |           | Dec. 31,  2022  |   |   |
| Delaware Basin Acquisition [Member]                                        |           |            |   |   |
| **Operating Loss Carryforwards:**                                          |           |            |   |   |
| Deferred Tax Assets, Operating Loss Carryforwards                          |           | $ 60,100        |   |   |
| 2017 Tax Act [Member]                                                      |           |            |   |   |
| **Operating Loss Carryforwards:**                                          |           |            |   |   |
| Income Tax Expense (Benefit)                                               | $ 114,400      |            |   |   |

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.
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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.
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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.
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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.
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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deductions. Including, but not limited to, extraterritorial income exclusion deduction, qualified production activity deduction, dividend deduction, deduction for dividend paid to employee stock ownership plan, Medicare prescription drug benefit subsidy deduction, and other deductions.
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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.
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Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format.
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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.
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