| **SUPPLEMENTAL INFORMATION - NATURAL GAS AND CRUDE OIL PROPERTIES Schedule of Developed and Undeveloped Reserves (Unaudited) (Details)** | 12 Months Ended |               |
|------------------------------------------------------------------------------------------------------------------------------------------|-----------------|---------------|
||
| **Schedule of Developed and Undeveloped Reserves [Line Items]**                                                                          |            |          |   |   |
| Proved Developed and Undeveloped Reserves, Net                                                                                           | 1,156,860,000   | 1,015,489,000 | 860,616,000 |   |
| Undeveloped Reserves Converted to Developed                                                                                              | 0               | 0             |   |   |
| Revisions of Previous Estimates                                                                                                          | (351,836,000)   | (154,100,000) |   |   |
| Extensions, Discoveries, and Other Additions                                                                                             | 407,647,000     | 313,039,000   |   |   |
| Purchases of Reserves                                                                                                                    | 200,522,000     | 48,703,000    |   |   |
| Dispositions                                                                                                                             | (65,350,000)    | (5,244,000)   |   |   |
| Production                                                                                                                               | (49,612,000)    | (47,525,000)  |   |   |
| Reserves disposition, PDCM Deconsolidation                                                                                               |            |          | (28,900,000) |   |
| Reserves disposition, Michigan Field                                                                                                     |            |          | (15,100,000) |   |
| Developed [Member]                                                                                                                       |            |          |   |   |
| **Schedule of Developed and Undeveloped Reserves [Line Items]**                                                                          |            |          |   |   |
| Proved Developed and Undeveloped Reserves, Net                                                                                           | 490,515,000     | 471,347,000   | 301,141,000 |   |
| Undeveloped Reserves Converted to Developed                                                                                              | 45,929,000      | 43,597,000    |   |   |
| Revisions of Previous Estimates                                                                                                          | (109,909,000)   | 73,643,000    |   |   |
| Extensions, Discoveries, and Other Additions                                                                                             | 67,787,000      | 58,979,000    |   |   |
| Purchases of Reserves                                                                                                                    | 81,253,000      | 46,756,000    |   |   |
| Dispositions                                                                                                                             | (16,280,000)    | (5,244,000)   |   |   |
| Production                                                                                                                               | (49,612,000)    | (47,525,000)  |   |   |
| Undeveloped [Member]                                                                                                                     |            |          |   |   |
| **Schedule of Developed and Undeveloped Reserves [Line Items]**                                                                          |            |          |   |   |
| Proved Developed and Undeveloped Reserves, Net                                                                                           | 666,345,000     | 544,142,000   | 559,475,000 |   |
| Undeveloped Reserves Converted to Developed                                                                                              | (45,929,000)    | (43,597,000)  |   |   |
| Revisions of Previous Estimates                                                                                                          | (241,927,000)   | (227,743,000) |   |   |
| Extensions, Discoveries, and Other Additions                                                                                             | 339,860,000     | 254,060,000   |   |   |
| Purchases of Reserves                                                                                                                    | 119,269,000     | 1,947,000     |   |   |
| Dispositions                                                                                                                             | (49,070,000)    | 0             |   |   |
| Production                                                                                                                               | 0               | 0             |   |   |
| Natural Gas Equivalent (MMcfe)                                                                                                           |            |          |   |   |
| **Schedule of Developed and Undeveloped Reserves [Line Items]**                                                                          |            |          |   |   |
| Proved Developed and Undeveloped Reserves, Net                                                                                           | 1,156,860,000   | 1,015,489,000 | 860,616,000 | 717,345,000 |
| Revisions of Previous Estimates                                                                                                          |            | (154,100,000) | 59,442,000 |   |
| Dispositions                                                                                                                             | (65,350,000)    | (5,244,000)   |   |   |
| Production                                                                                                                               | (49,612,000)    | (47,525,000)  | (38,643,000) |   |
| Year-over-Year Activity [Domain]                                                                                                         |            |          |   |   |
| **Schedule of Developed and Undeveloped Reserves [Line Items]**                                                                          |            |          |   |   |
| Revisions of Previous Estimates                                                                                                          | (351,836,000)   |          |   |   |
| Extensions, Discoveries, and Other Additions                                                                                             | 408,000,000     |          | 110,000,000 |   |
| Purchases of Reserves                                                                                                                    | 201,000,000     |          | 56,500,000 |   |
| Dispositions                                                                                                                             | (65,000,000)    |          | (44,020,000) |   |
| Revisions due to asset performance                                                                                                       | 14,000,000      | 12,000,000    | 55,600,000 |   |
| Revisions due to change in commodity pricing                                                                                             | (240,000,000)   | (4,000,000)   | 35,900,000 |   |
| Adjustments for geological reasons                                                                                                       | (46,000,000)    |          |   |   |
| Revisions due to separately stating NGLs                                                                                                 |            |          | 28,100,000 |   |
| Revision due to SEC 5 Year Rule                                                                                                          | (77,000,000)    | (173,000,000) |   |   |
| Revisions due to interest adjustments                                                                                                    | 3,000,000       | 5,000,000     | 1,500,000 |   |
| Revisions due to transfers from PUD to PDNP                                                                                              |            | 125,000,000   | (58,700,000) |   |
| Revisions due to changes in production costs                                                                                             |            | (6,000,000)   | (3,000,000) |   |
| Reserve discoveries, Eastern Operating Region                                                                                            | 57,000,000      | 51,000,000    | 35,100,000 |   |
| Reserve discoveries, Western Operating Region                                                                                            |            | 262,000,000   | 74,900,000 |   |
| Reserve discoveries, Wattenberg Field                                                                                                    | 351,000,000     | 141,000,000   | 29,400,000 |   |
| Reserve discoveries, Piceance Basin                                                                                                      |            | 80,000,000    | 36,200,000 |   |
| Reserve discoveries, NECO                                                                                                                |            |          | 9,100,000 |   |
| Reserve discoveries, North Dakota                                                                                                        |            |          | 200,000 |   |
| Reserve discoveries, Permian                                                                                                             |            | 41,000,000    |   |   |
| Reserves acquired, Permian                                                                                                               |            |          | 32,600,000 |   |
| Reserves acquired, Eastern Operating Region                                                                                              |            | 8,000,000     |   |   |
| Reserves acquired, Western Operating Region                                                                                              |            | 41,000,000    | 23,900,000 |   |
| Reserves acquired, Wattenberg Field                                                                                                      | 200,000,000     | 28,000,000    | 12,800,000 |   |
| Reserves acquired, Piceance Basin                                                                                                        |            | 13,000,000    | 10,900,000 |   |
| Reserves disposition, North Dakota                                                                                                       |            | (2,000,000)   |   |   |
| Reserves disposition, Permian Basin                                                                                                      |            | (3,000,000)   |   |   |
| Development Wells Drilled, Net Productive                                                                                                | 44              | 195           | 213 |   |

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Reserves acquired, Eastern Operating Region
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Reserves acquired, Permian
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Reserves acquired, Western Operating Region
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Reserves disposition, Michigan Field
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Reserves disposition, North Dakota
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Reserves disposition, Permian Basin
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Revision due to SEC 5 Year Rule
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Revisions due to asset performance
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Revisions due to changes in production costs
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Revisions due to interest adjustments
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Undeveloped Reserves Converted to Developed through the drilling process
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of productive developmental wells drilled in the geographic area. A productive well is a well that is not a dry well. The number of wells drilled refers to the number of wells (holes) completed at any time during the fiscal years, regardless when drilling was initiated.
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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.
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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.
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| - Definition
Production of proved reserves.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Purchase of minerals in place.
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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.
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| - Definition
Sales of minerals in place.
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