|**Reconciliation of Level 3 Fair Value Measurements (Details) (Derivative Financial Instrument Net Assets, USD $)In Thousands, unless otherwise specified** | 3 Months Ended                                                                                                                          | 6 Months Ended                                                                                                                         
|----------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------
|
|**Roll-forward of Level 3 Assets**                                                                                                                          |                                                                                                                                         |                                                                                                                                        
|Fair Value, net assets, beginning of period                                                                                                                 | $ 7,663                                                                                                                                 |                                                                                                                                        
|Fair Value, net assets, end of period                                                                                                                       | 3,904                                                                                                                                   |                                                                                                                                        
|Changes in unrealized gains (losses) relating to assets (liabilities) still held as of period end, included in statement of operations line item;           | (1,695)                                                                                                                                 |                                                                                                                                        
|Commodity Price Risk Management, net                                                                                                                        |                                                                                                                                         |                                                                                                                                        
|**Roll-forward of Level 3 Assets**                                                                                                                          |                                                                                                                                         |                                                                                                                                        
|Changes in fair value included in statement of operations line item:                                                                                        | 2,834                                                                                                                                   |                                                                                                                                        
|Settlements included in statement of operations line items:                                                                                                 | (2,246)                                                                                                                                 |                                                                                                                                        
|Changes in unrealized gains (losses) relating to assets (liabilities) still held as of period end, included in statement of operations line item;           | (1,717)                                                                                                                                 |                                                                                                                                        
|Sales From Natural Gas Marketing                                                                                                                            |                                                                                                                                         |                                                                                                                                        
|**Roll-forward of Level 3 Assets**                                                                                                                          |                                                                                                                                         |                                                                                                                                        
|Changes in fair value included in statement of operations line item:                                                                                        | 22                                                                                                                                      |                                                                                                                                        
|Settlements included in statement of operations line items:                                                                                                 | (3)                                                                                                                                     |                                                                                                                                        
|Changes in unrealized gains (losses) relating to assets (liabilities) still held as of period end, included in statement of operations line item;           | 22                                                                                                                                      |                                                                                                                                        
|Accounts Payable Affiliates                                                                                                                                 |                                                                                                                                         |                                                                                                                                        
|**Roll-forward of Level 3 Assets**                                                                                                                          |                                                                                                                                         |                                                                                                                                        
|Changes in fair value Included in blance seet line item:                                                                                                    | 0                                                                                                                                       | [1]                                                                                                                                    
|Income from Discontinued Operations, Net of Tax                                                                                                             |                                                                                                                                         |                                                                                                                                        
|**Roll-forward of Level 3 Assets**                                                                                                                          |                                                                                                                                         |                                                                                                                                        
|Settlements included in statement of operations line items:                                                                                                 | $ (4,366)                                                                                                                               |                                                                                                                                        
|                                                                                                                                                           
|[1]
              Represents the change in fair value related to derivative instruments entered into by us and designated to our affiliated partnerships.   | [1]                                                                                                                                     | Represents the change in fair value related to derivative instruments entered into by us and designated to our affiliated partnerships.
|[1]                                                                                                                                                         | Represents the change in fair value related to derivative instruments entered into by us and designated to our affiliated partnerships.

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