| **BUSINESS COMBINATIONS BUSINESS COMBINATIONS (Details) shares in Thousands, $ in Thousands**                   | 3 Months Ended | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Business Acquisition [Line Items]**                                                                           |           |            |   |   |
| Oil and gas producing wells, gross | Wells                                                                      |           | 2,800           |   |   |
| Issuance of common stock for acquisition of crude oil and natural gas properties                                |           | $ 0             | $ 690,702 | $ 0 |
| Goodwill                                                                                                        | $ 62,041       | $ 0             | 62,041 |   |
| Delaware Basin Acquisition [Member]                                                                             |           |            |   |   |
| **Business Acquisition [Line Items]**                                                                           |           |            |   |   |
| Payments to Acquire Businesses, Gross                                                                           | $ 946,000      |            | 945,962 |   |
| Payments for Deposits Applied to Debt Retirements                                                               |           |            | $ 40,000 |   |
| Oil and gas producing wells, gross | Wells                                                                      | 30             |            | 30 |   |
| Gas and Oil Area, Developed, Gross | a                                                                          | 57,900         |            | 57,900 |   |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net                      | $ 1,637,090    |            | $ 1,637,090 |   |
| Stock Issued During Period, Shares, Acquisitions | shares                                                       | 9,400          |            |   |   |
| Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual                 |           |            | 5,600 |   |
| Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual        |           |            | (1,700) |   |
| Issuance of common stock for acquisition of crude oil and natural gas properties                                |           |            | 690,702 |   |
| Non-Cash Basis                                                                                                  | $ 375,000      |            | 375,000 |   |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities | 374,707        |            | 374,707 |   |
| Delaware Basin [Member]                                                                                         |           |            |   |   |
| **Business Acquisition [Line Items]**                                                                           |           |            |   |   |
| Goodwill                                                                                                        | 75,121         |            | 75,121 |   |
| Goodwill, Other Increase (Decrease)                                                                             |           |            | 13,080 |   |
| Scenario, Previously Reported [Member] | Delaware Basin [Member]                                                |           |            |   |   |
| **Business Acquisition [Line Items]**                                                                           |           |            |   |   |
| Goodwill                                                                                                        | $ 62,041       |            | $ 62,041 |   |
| September 2016 Common Stock Issuance [Member]                                                                   |           |            |   |   |
| **Business Acquisition [Line Items]**                                                                           |           |            |   |   |
| Shares issued pursuant to sale of equity | shares                                                               |           |            | 9,085 |   |

| X                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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Non-Cash Basis allocated to acquired asset.
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The total number of producing oil and natural gas wells in which the entity owns an working interest.
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| - Definition
Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.
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| - Definition
This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.
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| - Definition
This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.
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| - Definition
Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date.
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| - Definition
Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.
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| - Definition
Area spaced or assigned to productive wells in which a working interest is owned.
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| - Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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| - Definition
Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.
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Cash outflow during the period as a deposit on account for application (deposits to retire or pay down) against an amount of debt owed by the entity.
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| - Definition
The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.
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| - Definition
Number of shares of stock issued during the period pursuant to acquisitions.
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| - Definition
Number of new stock issued during the period.
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