| **SUPPLEMENTAL INFORMATION - NATURAL GAS AND CRUDE OIL PROPERTIES Index price of reserves (Details) - USD ($)** | 12 Months Ended |
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| **oil and gas index price for reserves [Line Items]**                                                           |            |   |   |
| Effective Income Tax Rate Reconciliation, Percent                                                               | (37.40%)        | 35.90% | 39.50% |
| Crude Oil (Bbls)                                                                                                |            |   |   |
| **oil and gas index price for reserves [Line Items]**                                                           |            |   |   |
| oil and gas index price for reserves                                                                            | $ 42.75         | $ 50.28 | $ 94.99 |
| Natural Gas Liquids (Bbls)                                                                                      |            |   |   |
| **oil and gas index price for reserves [Line Items]**                                                           |            |   |   |
| oil and gas index price for reserves                                                                            | 42.75           | 50.28 | 94.99 |
| Natural Gas (Mcf)                                                                                               |            |   |   |
| **oil and gas index price for reserves [Line Items]**                                                           |            |   |   |
| oil and gas index price for reserves                                                                            | $ 2.48          | $ 2.59 | $ 4.35 |

| X                                                                                                                                                                                                                                                         |
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| - Definition
oil and gas index price for reserves.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
[Line Items] for oil and gas index price for reserves [Table]
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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| - Definition
Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319
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| X                                                                                                                                                                                               |
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| X                                                                                                                                                                                                                |
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| X                                                                                                                                                                                                         |
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