|**Commitments and Contingencies Commitments and Contigencies (Tables)** | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
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|**Commitments and Contingencies Disclosure [Abstract]**                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Supply Commitment                                                       | 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 as ofMarch 31, 2014:For the Twelve Months Ending March 31,Area20152016201720182019 andThroughExpirationTotalExpirationDateVolume (MMcf)Marcellus Shale19,07219,36120,98720,987120,161200,568January 31, 2026Utica Shale2,6232,7452,7372,73714,61125,453July 22, 2023Total21,69522,10623,72423,724134,772226,021Dollar commitment (in thousands)$7,323$7,429$7,745$7,287$36,807$66,591
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|Volume (MMcf)                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Marcellus Shale                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Utica Shale                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
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|Dollar commitment (in thousands)                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            

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