| **SUPPLEMENTAL INFORMATION - NATURAL GAS AND CRUDE OIL PROPERTIES Schedule of Developed and Undeveloped Reserves (Unaudited) (Details)** | 12 Months Ended |              |
|------------------------------------------------------------------------------------------------------------------------------------------|-----------------|--------------|
||
| Crude Oil Equivalent (Boe)                                                                                                               |            |         |   |   |
| **Schedule of Developed and Undeveloped Reserves [Line Items]**                                                                          |            |         |   |   |
| Proved Developed and Undeveloped Reserves, Net                                                                                           | 341,407,000     | 272,825,000  | 250,129,000 | 265,774,000 |
| Revisions of Previous Estimates                                                                                                          | (42,631,000)    | (93,471,000) | (64,825,000) |   |
| Extensions, Discoveries, and Other Additions                                                                                             | 1,531,000       | 131,494,000  | 98,029,000 |   |
| Purchases of Reserves                                                                                                                    | 133,583,000     | 76,000       | 17,000 |   |
| Dispositions                                                                                                                             | (1,725,000)     | (34,000)     | (39,572,000) |   |
| Production                                                                                                                               | (22,176,000)    | (15,369,000) | (9,294,000) |   |
| Year-over-Year Activity [Domain]                                                                                                         |            |         |   |   |
| **Schedule of Developed and Undeveloped Reserves [Line Items]**                                                                          |            |         |   |   |
| Undeveloped Reserves Converted to Developed                                                                                              | 32,200,000.0    | 29,000,000   | 13,000,000 |   |
| Revisions of Previous Estimates                                                                                                          |            | 93,000,000   | (65,000,000) |   |
| Extensions, Discoveries, and Other Additions                                                                                             | 16,800,000.0    | 131,000,000  | 98,000,000 |   |
| Wells Per Section                                                                                                                        |            | 16           |   |   |
| Gross PUD horizontal locations                                                                                                           |            | 791          | 774 |   |
| Dispositions                                                                                                                             |            |         | (40,000,000) |   |
| Production                                                                                                                               | 500,000         |         |   |   |
| Increase (decrease) in proved reserves | Boe                                                                                             | 68,582,000      | 23,000,000   | (16,000,000) |   |
| Estimated PUD conversion rate | Rate                                                                                                     | 19.00%          | 16.00%       | 7.00% |   |
| Actual PUD conversion rate | Rate                                                                                                        | 16.00%          | 17.00%       | 7.00% |   |
| Change in drilling plans                                                                                                                 |            | (56,000,000) | (55,000,000) |   |
| Upward (Downward) Revision due to change in SEC pricing                                                                                  |            | (33,000,000) |   |   |
| Upward (Downward) Revision due to removal of re-fracs                                                                                    |            | (11,000,000) |   |   |
| Upward (downward) revision due to geological findings                                                                                    |            | (22,000,000) |   |   |
| Downward revisions due to adjustments in previous PUD well spacing plans                                                                 |            |         | (2,000,000) |   |
| Downward revisions Wattenberg Field related to PUDs that are no longer in our core drilling area                                         |            |         | (8,000,000) |   |
| Reserve discoveries from non-PUD drilling                                                                                                |            |         | 16,000,000 |   |
| Extension and discoveries due to adjustments in wells spacing in Wattenberg Field and Marcellus Shale                                    |            |         | 78,000,000 |   |
| Extension and discoveries in the Utica Shale                                                                                             |            |         | 2,000,000 |   |
| Reserve discoveries, refracs not added in prior year report                                                                              |            |         | 2,000,000 |   |

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Actual PUD conversion rate
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Change in drilling plans
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Estimated PUD conversion rate
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Extension and discoveries due to ue to adjustments in wells spacing in Wattenberg Field and Marcellus Shale
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No definition available.
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Extension and discoveries in the Utica Shale
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Gross PUD horizontal locations
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Reserve discoveries from non-PUD drilling
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Reserve discoveries, refracs not added in prior year report
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[Line Items] for Schedule of Developed and Undeveloped Reserves [Table]
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| X                                                                                                                                                                                                                                                                                               |
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Undeveloped Reserves Converted to Developed through the drilling process
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| - Definition
Upward (Downward) Revision due to change in SEC pricing
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Upward (Downward) Revision due to removal of re-fracs
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Upward (Downward) revisions Wattenberg Field related to PUDs that are no longer in our core drilling area
+ References
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Upward (Downward) revisions due to adjustments in previous PUD well spacing plans
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Upward (downward) revision due to geological findings
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| X                                                                                                                                                                                                                             |
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| - Definition
Number of Wells Per Section
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
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| - Definition
Energy measure of increase (decrease) of quantity of proved reserve of oil and gas, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable.
+ References
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| - Definition
Production of proved reserves.
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| - Definition
Purchase of minerals in place.
+ References
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| - Definition
Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.
+ References
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| - Definition
Sales of minerals in place.
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