| **Commitments and Contingencies Commitments and Contigencies (Tables)** | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
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| **Commitments and Contingencies Disclosure [Abstract]**                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Supply Commitment                                                       | :  For the Twelve Months Ending March 31,    Area 2016 2017 2018 2019 2020 andThroughExpiration Total ExpirationDate               Natural gas (MMcf)              Appalachian Basin 7,136 7,117 7,117 7,117 24,049 52,536 August 31, 2022Utica Shale 2,745 2,737 2,737 2,737 11,874 22,830 July 22, 2023Total 9,881 9,854 9,854 9,854 35,923 75,366                 Crude oil (MBbls)              Wattenberg Field 2,017 2,413 2,413 2,413 2,818 12,074 May 31, 2020               Dollar commitment (in thousands) $15,526 $17,575 $16,850 $16,326 $28,430 $94,707   |

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| - Definition
Tabular disclosure of arrangements in which the entity has committed resources to supply goods or services to a customer. May include identification of the goods or services to be furnished, identity of the purchasing party, pricing, effects on pricing for failing to deliver the [minimum] quantities required to be furnished, cancellation rights, and termination provisions.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 25 -Article 5Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 7Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 9Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph 25 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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