| **ACQUISITIONS Additional Information (Details) (USD $)In Millions, unless otherwise specified**           | 3 Months Ended |
|------------------------------------------------------------------------------------------------------------|----------------|
||
| PDCM [Member]                                                                                              |           |
| **Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]** |           |
| Payments for Previous Acquisition                                                                          | $ 24.3         |
| Ownership interest in PDCM [Member]                                                                        |           |
| **Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]** |           |
| Payments for Previous Acquisition                                                                          | 12.2           |
| Merit Acquisition                                                                                          |           |
| **Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]** |           |
| Escrow Deposit Disbursements Related to Property Acquisition                                               | 17.5           |
| Initial Purchase Price [Member] | PDCM [Member]                                                            |           |
| **Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]** |           |
| Acquisition Costs, Cumulative                                                                              | 162.9          |
| Adjusted Purchase Price [Member] | PDCM [Member]                                                           |           |
| **Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]** |           |
| Acquisition Costs, Cumulative                                                                              | 138.6          |
| Adjusted Purchase Price [Member] | Ownership interest in PDCM [Member]                                     |           |
| **Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]** |           |
| Acquisition Costs, Cumulative                                                                              | $ 69.3         |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=21918352&loc=d3e511914-122862
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| X                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivitiesLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Escrow deposit disbursements related to property acquisition in noncash investing or financing transactions.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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| X                                                                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Cash outflow representing an adjustment to the purchase price of a previous acquisition.
+ References
No definition available.
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