| **COMMITMENTS AND CONTINGENCIES Commitments and Contigencies (Details) $ in Thousands** | 12 Months Ended |
|-----------------------------------------------------------------------------------------|-----------------|
||
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 340,679         |
| Dollar Commitment ($ in thousands) | $                                                  | $ 429,741       |
| LT transportation volumes, net to interest | $                                          | $ 27,300        |
| 2019                                                                                    |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 79,198          |
| Dollar Commitment ($ in thousands) | $                                                  | $ 106,844       |
| 2020                                                                                    |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 75,676          |
| Dollar Commitment ($ in thousands) | $                                                  | $ 78,209        |
| 2021                                                                                    |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 59,388          |
| Dollar Commitment ($ in thousands) | $                                                  | $ 74,409        |
| 2022                                                                                    |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 35,520          |
| Dollar Commitment ($ in thousands) | $                                                  | $ 67,354        |
| commitments 5 years and beyond [Member]                                                 |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 90,897          |
| Dollar Commitment ($ in thousands) | $                                                  | $ 102,925       |
| Appalachiain Basin                                                                      |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 25,804          |
| Appalachiain Basin | 2019                                                               |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 7,117           |
| Appalachiain Basin | 2020                                                               |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 7,136           |
| Appalachiain Basin | 2021                                                               |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 7,056           |
| Appalachiain Basin | 2022                                                               |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 4,495           |
| Appalachiain Basin | commitments 5 years and beyond [Member]                            |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 0               |
| Appalachiain Basin | Supply Contract Expiration Date [Member]                           |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Supply Commitments Contract Expiration Date                                             | Aug. 31,  2022  |
| Wattenberg Field                                                                        |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 207,991         |
| Wattenberg Field | 2019                                                                 |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 23,934          |
| Wattenberg Field | 2020                                                                 |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 31,110          |
| Wattenberg Field | 2021                                                                 |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 31,025          |
| Wattenberg Field | 2022                                                                 |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 31,025          |
| Wattenberg Field | commitments 5 years and beyond [Member]                              |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 90,897          |
| Wattenberg Field | Supply Contract Expiration Date [Member]                             |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Supply Commitments Contract Expiration Date                                             | Apr. 30,  2026  |
| Delaware Basin [Member]                                                                 |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 106,884         |
| Delaware Basin [Member] | 2019                                                          |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 48,147          |
| Delaware Basin [Member] | 2020                                                          |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 37,430          |
| Delaware Basin [Member] | 2021                                                          |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 21,307          |
| Delaware Basin [Member] | 2022                                                          |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 0               |
| Delaware Basin [Member] | commitments 5 years and beyond [Member]                       |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 0               |
| Delaware Basin [Member] | Supply Contract Expiration Date [Member]                      |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Supply Commitments Contract Expiration Date                                             | Dec. 31,  2021  |
| Water [Member] | Wattenberg Field                                                       |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 34,137          |
| Water [Member] | Wattenberg Field | 2019                                                |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 3,103           |
| Water [Member] | Wattenberg Field | 2020                                                |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 6,207           |
| Water [Member] | Wattenberg Field | 2021                                                |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 6,207           |
| Water [Member] | Wattenberg Field | 2022                                                |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 6,207           |
| Water [Member] | Wattenberg Field | commitments 5 years and beyond [Member]             |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 12,413          |
| Water [Member] | Wattenberg Field | Supply Contract Expiration Date [Member]            |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Supply Commitments Contract Expiration Date                                             | Dec. 31,  2024  |
| Water [Member] | Delaware Basin [Member]                                                |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 16,380          |
| Water [Member] | Delaware Basin [Member] | 2019                                         |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 3,650           |
| Water [Member] | Delaware Basin [Member] | 2020                                         |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 3,660           |
| Water [Member] | Delaware Basin [Member] | 2021                                         |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 3,650           |
| Water [Member] | Delaware Basin [Member] | 2022                                         |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 3,650           |
| Water [Member] | Delaware Basin [Member] | commitments 5 years and beyond [Member]      |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 1,770           |
| Water [Member] | Delaware Basin [Member] | Supply Contract Expiration Date [Member]     |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Supply Commitments Contract Expiration Date                                             | Jun. 26,  2023  |
| Crude Oil [Member] | Wattenberg Field                                                   |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 29,761          |
| Crude Oil [Member] | Wattenberg Field | 2019                                            |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 9,713           |
| Crude Oil [Member] | Wattenberg Field | 2020                                            |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 5,918           |
| Crude Oil [Member] | Wattenberg Field | 2021                                            |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 5,475           |
| Crude Oil [Member] | Wattenberg Field | 2022                                            |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 5,475           |
| Crude Oil [Member] | Wattenberg Field | commitments 5 years and beyond [Member]         |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 3,180           |
| Crude Oil [Member] | Wattenberg Field | Supply Contract Expiration Date [Member]        |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Supply Commitments Contract Expiration Date                                             | Apr. 30,  2023  |
| Crude Oil [Member] | Delaware Basin [Member]                                            |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 40,233          |
| Crude Oil [Member] | Delaware Basin [Member] | 2019                                     |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 7,359           |
| Crude Oil [Member] | Delaware Basin [Member] | 2020                                     |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 8,784           |
| Crude Oil [Member] | Delaware Basin [Member] | 2021                                     |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 8,030           |
| Crude Oil [Member] | Delaware Basin [Member] | 2022                                     |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 8,030           |
| Crude Oil [Member] | Delaware Basin [Member] | commitments 5 years and beyond [Member]  |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 8,030           |
| Crude Oil [Member] | Delaware Basin [Member] | Supply Contract Expiration Date [Member] |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Supply Commitments Contract Expiration Date                                             | Dec. 31,  2023  |
| First facilities agreement with midstream provider [Member]                             |            |
| **Supply Commitment [Line Items]**                                                      |            |
| incremental volume commitment                                                           | 51.5            |
| Second facilities agreement with midstream provider [Member]                            |            |
| **Supply Commitment [Line Items]**                                                      |            |
| incremental volume commitment                                                           | 33.5            |
| Water [Member]                                                                          |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 50,517          |
| Water [Member] | 2019                                                                   |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 6,753           |
| Water [Member] | 2020                                                                   |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 9,867           |
| Water [Member] | 2021                                                                   |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 9,857           |
| Water [Member] | 2022                                                                   |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 9,857           |
| Water [Member] | commitments 5 years and beyond [Member]                                |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 14,183          |
| Crude Oil [Member]                                                                      |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 69,994          |
| Crude Oil [Member] | 2019                                                               |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 17,072          |
| Crude Oil [Member] | 2020                                                               |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 14,702          |
| Crude Oil [Member] | 2021                                                               |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 13,505          |
| Crude Oil [Member] | 2022                                                               |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 13,505          |
| Crude Oil [Member] | commitments 5 years and beyond [Member]                            |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 11,210          |
| Minimum [Member] | Delaware Basin [Member]                                              |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Committed Barrels of Crude Oil per day | bbl                                            | 14,600          |
| Maximum [Member] | Delaware Basin [Member]                                              |            |
| **Supply Commitment [Line Items]**                                                      |            |
| Committed Barrels of Crude Oil per day | bbl                                            | 26,400          |

| X                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Committed Barrels of Crude Oil per day
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Incremental volume commitment per day, for seven years to our midstream provider.
+ References
No definition available.
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LT transportation volumes, net to interest
+ References
No definition available.
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| - Definition
Supply Commitments Contract Expiration Date
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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| - Definition
Total amount of product committed to be supplied under existing contracts or agreements.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1207 -Paragraph (a) -Subparagraph (2)
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity must commit resources to supply goods or services to one or more customers.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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