| **BUSINESS COMBINATIONS Pro Form Detail (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands** | 12 Months Ended |
|------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| September 2016 Common Stock Issuance [Member]                                                                          |            |   |
| **Business Acquisition [Line Items]**                                                                                  |            |   |
| Shares issued pursuant to sale of equity                                                                               | 9,085           |   |
| Delaware Basin [Member]                                                                                                |            |   |
| **Business Acquisition [Line Items]**                                                                                  |            |   |
| Business Acquisition, Pro Forma Net Income (Loss)                                                                      | $ (270,942)     | $ (138,904) |
| Business Acquisition, Pro Forma Earnings Per Share, Basic                                                              | $ (4.22)        | $ (2.41) |
| Business Acquisition, Pro Forma Revenue                                                                                | $ 412,746       | $ 598,932 |
| Delaware Basin Acquisition [Member]                                                                                    |            |   |
| **Business Acquisition [Line Items]**                                                                                  |            |   |
| 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)       |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
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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.
+ References
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| - Definition
Number of new stock issued during the period.
+ References
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| X                                                                                                                                                                     |
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