| **SUPPLEMENTAL INFORMATION - NATURAL GAS AND CRUDE OIL PROPERTIES Changes in Estimated Proved Reserves (Unaudited) (Details) Mcf in Thousands** | 12 Months Ended |              |
|-------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|--------------|
||
| Crude Oil (Bbls)                                                                                                                                |            |         |   |   |
| **Reserve Quantities [Line Items]**                                                                                                             |            |         |   |   |
| Proved Reserves                                                                                                                                 | 118,169,000     | 98,975,000   | 100,515,000 | 93,830,000 |
| Production                                                                                                                                      | (8,728,000)     | (6,984,000)  | (4,322,000) |   |
| Purchases of Reserves                                                                                                                           | 50,126,000      | 17,000       | 5,000 |   |
| Dispositions                                                                                                                                    | (601,000)       | (12,000)     | (13,000) |   |
| Extensions, Discoveries, and Other Additions                                                                                                    | 494,000         | 48,707,000   | 40,792,000 |   |
| Revisions of Previous Estimates                                                                                                                 | (22,097,000)    | (43,268,000) | (29,777,000) |   |
| Proved Developed Reserves                                                                                                                       | 30,013,000      | 26,257,000   | 26,798,000 |   |
| Proved Undeveloped Reserve                                                                                                                      | 88,156,000      | 72,718,000   | 73,717,000 |   |
| Natural Gas (Mcf)                                                                                                                               |            |         |   |   |
| **Reserve Quantities [Line Items]**                                                                                                             |            |         |   |   |
| Proved Reserves | Mcf                                                                                                                           | 833,697         | 660,737      | 536,972 | 739,640 |
| Production | Mcf                                                                                                                                | (51,730)        | (33,302)     | (19,298) |   |
| Purchases of Reserves | Mcf                                                                                                                     | 305,224         | 215          | 43 |   |
| Dispositions | Mcf                                                                                                                              | (4,202)         | (82)         | (237,306) |   |
| Extensions, Discoveries, and Other Additions | Mcf                                                                                              | 4,094           | 311,709      | 202,957 |   |
| Revisions of Previous Estimates | Mcf                                                                                                           | (80,426)        | (154,775)    | (149,064) |   |
| Proved Developed Reserves | Mcf                                                                                                                 | 264,452         | 175,367      | 186,633 |   |
| Proved Undeveloped Reserve | Mcf                                                                                                                | 569,245         | 485,370      | 350,339 |   |
| Natural Gas Liquids (Bbls)                                                                                                                      |            |         |   |   |
| **Reserve Quantities [Line Items]**                                                                                                             |            |         |   |   |
| Proved Reserves                                                                                                                                 | 84,288,000      | 63,727,000   | 60,119,000 | 48,671,000 |
| Production                                                                                                                                      | (4,826,000)     | (2,835,000)  | (1,756,000) |   |
| Purchases of Reserves                                                                                                                           | 32,586,000      | 23,000       | 5,000 |   |
| Dispositions                                                                                                                                    | (424,000)       | (8,000)      | (8,000) |   |
| Extensions, Discoveries, and Other Additions                                                                                                    | 355,000         | 30,835,000   | 23,411,000 |   |
| Revisions of Previous Estimates                                                                                                                 | (7,130,000)     | (24,407,000) | (10,204,000) |   |
| Proved Developed Reserves                                                                                                                       | 24,196,000      | 15,011,000   | 17,002,000 |   |
| Proved Undeveloped Reserve                                                                                                                      | 60,092,000      | 48,716,000   | 43,117,000 |   |
| Crude Oil Equivalent (Boe)                                                                                                                      |            |         |   |   |
| **Reserve Quantities [Line Items]**                                                                                                             |            |         |   |   |
| Proved Reserves                                                                                                                                 | 341,407,000     | 272,825,000  | 250,129,000 | 265,774,000 |
| Production                                                                                                                                      | (22,176,000)    | (15,369,000) | (9,294,000) |   |
| Purchases of Reserves                                                                                                                           | 133,583,000     | 76,000       | 17,000 |   |
| Dispositions                                                                                                                                    | (1,725,000)     | (34,000)     | (39,572,000) |   |
| Extensions, Discoveries, and Other Additions                                                                                                    | 1,531,000       | 131,494,000  | 98,029,000 |   |
| Revisions of Previous Estimates                                                                                                                 | (42,631,000)    | (93,471,000) | (64,825,000) |   |
| Proved Developed Reserves                                                                                                                       | 98,284,000      | 70,496,000   | 74,905,000 |   |
| Proved Undeveloped Reserve                                                                                                                      | 243,122,000     | 202,329,000  | 175,224,000 |   |
| Year-over-Year Activity [Domain]                                                                                                                |            |         |   |   |
| **Reserve Quantities [Line Items]**                                                                                                             |            |         |   |   |
| Proved developed and undeveloped reserves percent increase or decrease | Rate                                                                   | 25.13773%       |         |   |   |
| Increase (decrease) in proved reserves | Boe                                                                                                    | 68,582,000      | 23,000,000   | (16,000,000) |   |
| Production                                                                                                                                      | 500,000         |         |   |   |
| Proved developed and undeveloped reserves performance revisions                                                                                 | 2,100,000       |         |   |   |
| Undeveloped Reserves Converted to Developed                                                                                                     | 32,200,000.0    | 29,000,000   | 13,000,000 |   |
| Estimated PUD conversion rate for following year | Rate                                                                                         | 26.00%          |         |   |   |
| Dispositions                                                                                                                                    |            |         | (40,000,000) |   |
| Extensions, Discoveries, and Other Additions                                                                                                    | 16,800,000.0    | 131,000,000  | 98,000,000 |   |
| Revisions of Previous Estimates                                                                                                                 |            | 93,000,000   | (65,000,000) |   |
| Estimated PUD conversion rate | Rate                                                                                                            | 19.00%          | 16.00%       | 7.00% |   |
| Actual PUD conversion rate | Rate                                                                                                               | 16.00%          | 17.00%       | 7.00% |   |
| 2015 PUD Reserves [Member] | Year-over-Year Activity [Domain]                                                                                   |            |         |   |   |
| **Reserve Quantities [Line Items]**                                                                                                             |            |         |   |   |
| Increase (decrease) in proved reserves | Boe                                                                                                    | 61,000,000.0    |         |   |   |

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Estimated PUD conversion rate for following year.
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| X                                                                                                                                                                                                                                                                                                                      |
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Proved developed and undeveloped reserves percent increase or decrease.
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Proved developed and undeveloped reserves performance revisions
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Undeveloped Reserves Converted to Developed through the drilling process
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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.
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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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Sales of minerals in place.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.
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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.
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