|**Commitments and Contingencies (Tables)**              | 3 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 sales, processing and transportation agreements for pipeline capacity:For the Twelve Months Ending September 30,Area20132014201520162017 ThroughExpirationTotalExpirationDateVolume (MMcf)Piceance Basin25,22537,71331,90527,09092,033213,966May 31, 2021Appalachian Basin21,21620,35922,85524,186174,575263,191September 30, 2025NECO2,5541,9161,8251,8254558,575December 31, 2016Total48,99559,98856,58553,101267,063485,732Dollar commitment(in thousands)$22,604$28,473$25,887$23,625$104,264$204,853
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|Area                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
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|Volume (MMcf)                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Piceance Basin                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Appalachian Basin                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|NECO                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
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|Dollar commitment(in thousands)                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
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