| **INCOME TAXES Tax Effects of Temporary differences that Give Rise to Significant Portions of the Deferred Tax Assets and Liabilities (Details) (USD $)In Thousands, unless otherwise specified** | Dec. 31, 2012 | Dec. 31, 2011 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Components of Deferred Tax Assets [Abstract]**                                                                                                                                                  |          |          |
| Deferred Tax Assets, Provision for Underpayment of Natural Gas Sales                                                                                                                              | $ 0           | $ 3,334       |
| Deferred compensation                                                                                                                                                                             | 7,216         | 4,319         |
| Asset retirement obligations                                                                                                                                                                      | 10,325        | 9,438         |
| State NOL and tax credit carryforwards, net                                                                                                                                                       | 6,117         | 5,240         |
| Percentage depletion - Carryforward                                                                                                                                                               | 4,702         | 3,733         |
| Alternative minimum tax - credit carryforward                                                                                                                                                     | 2,351         | 2,351         |
| Federal NOL carryforward                                                                                                                                                                          | 21,281        | 12,210        |
| Other                                                                                                                                                                                             | 2,276         | 2,621         |
| Deferred tax assets                                                                                                                                                                               | 54,268        | 43,246        |
| **Components of Deferred Tax Liabilities [Abstract]**                                                                                                                                             |          |          |
| properties and equipment                                                                                                                                                                          | 122,742       | 184,657       |
| Investment in PDCM                                                                                                                                                                                | 31,445        | 30,919        |
| Unrealized gains - derivatives                                                                                                                                                                    | 7,163         | 12,612        |
| Convertible debt                                                                                                                                                                                  | 5,194         | 6,504         |
| Total gross deferred tax liabilities                                                                                                                                                              | 166,544       | 234,692       |
| Net deferred tax liability                                                                                                                                                                        | 112,276       | 191,446       |
| Deferred income tax assets                                                                                                                                                                        | 36,151        | 16,127        |
| Deferred income tax liability                                                                                                                                                                     | $ 148,427     | $ 207,573     |

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.
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Amount before allocation of valuation allowances of deferred tax asset attributable to other deductible tax carryforwards not separately disclosed.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from state taxes.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.
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Amount of deferred tax liability attributable to taxable temporary differences from derivatives.
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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.
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