|**Commitments and Contingencies Commitments and Contigencies (Tables)** | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                           
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|**Commitments and Contingencies Disclosure [Abstract]**                 |                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Supply Commitment                                                       | :For the Twelve Months Ending June 30,Area20172018201920202021 andThroughExpirationTotalExpirationDateNatural gas (MMcf)Gas Marketing segment7,1177,1177,1177,13615,13843,625August 31, 2022Utica Shale2,7382,7382,7382,7458,44419,403July 22, 2023Total9,8559,8559,8559,88123,58263,028Crude oil (MBbls)Wattenberg Field2,4132,4132,4132,421—9,660June 30, 2020Dollar commitment (in thousands)$17,573$16,536$16,324$16,369$9,052$75,854
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|Area                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                          
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|Natural gas (MMcf)                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Gas Marketing segment                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Utica Shale                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Total                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                          
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|Crude oil (MBbls)                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Wattenberg Field                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                          
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|Dollar commitment (in thousands)                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                          

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duration X- DefinitionTabular 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.
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