| **Commitments and Contingencies (Details) (USD $)In Thousands, unless otherwise specified** | Sep. 30, 2012MMcf     |
|---------------------------------------------------------------------------------------------|-----------------------|
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 485,732               |
| Dollar commitment (in thousands)                                                            | $ 204,853             |
| Twelve Months Ending September 30, 2013                                                     |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 48,995                |
| Dollar commitment (in thousands)                                                            | 22,604                |
| Twelve Months Ending September 30, 2014                                                     |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 59,988                |
| Dollar commitment (in thousands)                                                            | 28,473                |
| Twelve Months Ending September 30, 2015                                                     |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 56,585                |
| Dollar commitment (in thousands)                                                            | 25,887                |
| Twelve Months Ending September 30, 2016                                                     |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 53,101                |
| Dollar commitment (in thousands)                                                            | 23,625                |
| Twelve Months Ending September 30, 2017 Through Expiration                                  |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 267,063               |
| Dollar commitment (in thousands)                                                            | $ 104,264             |
| Piceance Basin                                                                              |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 213,966               |
| Piceance Basin | Twelve Months Ending September 30, 2013                                    |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 25,225                |
| Piceance Basin | Twelve Months Ending September 30, 2014                                    |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 37,713                |
| Piceance Basin | Twelve Months Ending September 30, 2015                                    |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 31,905                |
| Piceance Basin | Twelve Months Ending September 30, 2016                                    |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 27,090                |
| Piceance Basin | Twelve Months Ending September 30, 2017 Through Expiration                 |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 92,033                |
| Piceance Basin | Supply Contract Expiration Date [Member]                                   |                  |
| **Gross Volume Information**                                                                |                  |
| Expiration Date                                                                             | May 31,         2021  |
| Appalachiain Basin                                                                          |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 263,191               |
| Appalachiain Basin | Twelve Months Ending September 30, 2013                                |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 21,216                |
| Appalachiain Basin | Twelve Months Ending September 30, 2014                                |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 20,359                |
| Appalachiain Basin | Twelve Months Ending September 30, 2015                                |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 22,855                |
| Appalachiain Basin | Twelve Months Ending September 30, 2016                                |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 24,186                |
| Appalachiain Basin | Twelve Months Ending September 30, 2017 Through Expiration             |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 174,575               |
| Appalachiain Basin | Supply Contract Expiration Date [Member]                               |                  |
| **Gross Volume Information**                                                                |                  |
| Expiration Date                                                                             | Sep. 30,         2025 |
| NECO                                                                                        |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 8,575                 |
| NECO | Twelve Months Ending September 30, 2013                                              |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 2,554                 |
| NECO | Twelve Months Ending September 30, 2014                                              |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 1,916                 |
| NECO | Twelve Months Ending September 30, 2015                                              |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 1,825                 |
| NECO | Twelve Months Ending September 30, 2016                                              |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 1,825                 |
| NECO | Twelve Months Ending September 30, 2017 Through Expiration                           |                  |
| **Gross Volume Information**                                                                |                  |
| Oil and Gas Delivery Commitments (MMcf)                                                     | 455                   |
| NECO | Supply Contract Expiration Date [Member]                                             |                  |
| **Gross Volume Information**                                                                |                  |
| Expiration Date                                                                             | Dec. 31,         2016 |

| X                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Supply Contracts 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 Industry Guide -Number 2 -Paragraph 8 -Subparagraph A
+ Details**Name:**us-gaap_OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume**Namespace Prefix:**us-gaap_**Data Type:**num:volumeItemType**Balance Type:**na**Period Type:**instant |
| 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 9Reference 2: 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 3: 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 4: 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=d3e572229-122910Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 25 -Article 5Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 7
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| X                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------|
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