Discontinued Operations (Details 1) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Composition of assets of discontinued operations:
Natural gas and oil properties, net	$ 12,546	$ 838,044
Transportation and field assets, net	0	684
Accounts receivable	3,805	29,300
Unrealized derivative gain	0	8,195
Inventory and other	0	81
Total assets of discontinued operations	16,351	876,304
Composition of liabilities of discontinued operations:
Account payable	12,592	23,366
Accrued liabilities	6,789	9,596
Total current liabilities of discontinued operations	19,381	32,962
Asset retirement obligations	0	1,980
Other liabilities	0	1,921
Total long-term liabilities of discontinued operations	$ 0	$ 3,901

Total current liabilities of discontinued operations.

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Disposal group including discontinued operation unrealized derivative gain.

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The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for assets of a disposal group, including a component of the entity (discontinued operation), to be sold or that has been disposed of through sale, as of the financial statement date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 46
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification
-Topic 205
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-Section 45
-Paragraph 10
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For the disposal group, including a component of the entity (discontinued operation), the aggregate of amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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