| **Commitments and Contingencies Commitments and Contigencies (Details) $ in Thousands** | 6 Months Ended |
|-----------------------------------------------------------------------------------------|----------------|
||
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 63,028         |
| Dollar Commitment ($ in thousands) | $                                                  | $ 75,854       |
| Appalachiain Basin                                                                      |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 43,625         |
| Utica Shale                                                                             |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 19,403         |
| Wattenberg Field                                                                        |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 9,660          |
| First Year Commitment [Member]                                                          |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 9,855          |
| Dollar Commitment ($ in thousands) | $                                                  | $ 17,573       |
| First Year Commitment [Member] | Appalachiain Basin                                     |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 7,117          |
| First Year Commitment [Member] | Utica Shale                                            |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 2,738          |
| First Year Commitment [Member] | Wattenberg Field                                       |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 2,413          |
| Second Year Commitment [Member]                                                         |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 9,855          |
| Dollar Commitment ($ in thousands) | $                                                  | $ 16,536       |
| Second Year Commitment [Member] | Appalachiain Basin                                    |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 7,117          |
| Second Year Commitment [Member] | Utica Shale                                           |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 2,738          |
| Second Year Commitment [Member] | Wattenberg Field                                      |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 2,413          |
| Third Year Commitment [Member]                                                          |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 9,855          |
| Dollar Commitment ($ in thousands) | $                                                  | $ 16,324       |
| Third Year Commitment [Member] | Appalachiain Basin                                     |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 7,117          |
| Third Year Commitment [Member] | Utica Shale                                            |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 2,738          |
| Third Year Commitment [Member] | Wattenberg Field                                       |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 2,413          |
| Fourth Year Commitment [Member]                                                         |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 9,881          |
| Dollar Commitment ($ in thousands) | $                                                  | $ 16,369       |
| Fourth Year Commitment [Member] | Appalachiain Basin                                    |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 7,136          |
| Fourth Year Commitment [Member] | Utica Shale                                           |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 2,745          |
| Fourth Year Commitment [Member] | Wattenberg Field                                      |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 2,421          |
| commitments 5 years and beyond [Member]                                                 |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 23,582         |
| Dollar Commitment ($ in thousands) | $                                                  | $ 9,052        |
| commitments 5 years and beyond [Member] | Appalachiain Basin                            |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 15,138         |
| commitments 5 years and beyond [Member] | Utica Shale                                   |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf)                                         | 8,444          |
| commitments 5 years and beyond [Member] | Wattenberg Field                              |           |
| **Supply Commitment**                                                                   |           |
| Oil and Gas Delivery Commitments Volumes (MMcf) | MBbls                                 | 0              |
| Supply Contract Expiration Date [Member] | Appalachiain Basin                           |           |
| **Supply Commitment**                                                                   |           |
| Supply Commitments Contract Expiration Date                                             | Aug. 31,  2022 |
| Supply Contract Expiration Date [Member] | Utica Shale                                  |           |
| **Supply Commitment**                                                                   |           |
| Supply Commitments Contract Expiration Date                                             | Jul. 22,  2023 |
| Supply Contract Expiration Date [Member] | Wattenberg Field                             |           |
| **Supply Commitment**                                                                   |           |
| Supply Commitments Contract Expiration Date                                             | Jun. 30,  2020 |

| X                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Supply Commitments Contract Expiration Date
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total amount of product committed to be supplied under existing contracts or agreements.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1207 -Paragraph (a) -Subparagraph (2)
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity must commit resources to supply goods or services to one or more customers.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.17) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878Reference 2: 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=d3e13212-122682Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a)(19)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910
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| X                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
+ Details**Name:**us-gaap_SupplyCommitmentLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
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