|**COMMITMENTS AND CONTINGENCIES Commitments and Contigencies (Tables)**                                | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
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|**Commitments and Contingencies Disclosure [Abstract]**                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Supply Commitment [Table Text Block]                                                                   | The following table presents gross volume information, including our proportionate share of PDCM, related to our long-term firm transportation, sales and processing agreements for pipeline capacity:Year Ending December 31,Area20132014201520162017ThroughExpirationTotalExpirationDateVolume (MMcf)Piceance Basin30,71036,16830,60326,05385,895209,429May 31, 2021Appalachian Basin20,31624,35323,36124,862168,296261,188September 20, 2025NECO2,1901,8251,8251,825—7,665December 31, 2016Total53,21662,34655,78952,740254,191478,282Dollar commitment (in thousands)$25,756$29,283$26,163$24,075$94,033$199,310
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|Volume (MMcf)                                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Piceance Basin                                                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Appalachian Basin                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|NECO                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
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|Dollar commitment (in thousands)                                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
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|Schedule of Minimum Future Lease Payments under the Non-cancelable Operating Leases [Table Text Block] | The following table presents the minimum future lease payments under the non-cancelable operating leases as ofDecember 31, 2012:Year Ending December 31,20132014201520162017ThereafterTotal(in thousands)Minimum Lease Payments$2,607$2,386$1,929$461$255$887$8,525                                                                                                                                                                                                                                                                                                                                                 
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|Minimum Lease Payments                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
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