|**Commitments and Contingencies Commitments and Contigencies (Tables)** | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|----------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
|**Commitments and Contingencies Disclosure [Abstract]**                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Supply Commitment                                                       | :For the Twelve Months Ending June 30,Area20182019202020212022 andThroughExpirationTotalExpirationDateNatural gas (MMcf)Wattenberg Field—9,73418,84918,79879,979127,360March 31, 2026Delaware Basin14,60014,60014,6407,360—51,200December 31, 2020Gas Marketing7,1177,1177,1367,1178,02136,508August 31, 2022Utica Shale2,7372,7372,7452,7375,70916,665July 22, 2023Total24,45434,18843,37036,01293,709231,733Crude oil (MBbls)Wattenberg Field2,4132,4142,420——7,247June 30, 2020Dollar commitment (in thousands)$18,583$28,104$36,564$22,665$81,560$187,476
|                                                                       
|                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Area                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Natural gas (MMcf)                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Wattenberg Field                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Delaware Basin                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Gas Marketing                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Utica Shale                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Total                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Crude oil (MBbls)                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Wattenberg Field                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Dollar commitment (in thousands)                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              

X- ReferencesNo definition available.
+ Details**Name:**
us-gaap_CommitmentsAndContingenciesDisclosureAbstract**Namespace Prefix:**
us-gaap_**Data Type:**
xbrli:stringItemType**Balance Type:**
na**Period Type:**
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.
+ ReferencesReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(25)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
+ Details**Name:**
us-gaap_SupplyCommitmentTableTextBlock**Namespace Prefix:**
us-gaap_**Data Type:**
nonnum:textBlockItemType**Balance Type:**
na**Period Type:**
duration