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TG Barnett Sale TG Barnett Sale(Details) (USD $)	3 Months Ended				3 Months Ended
TG Barnett Sale TG Barnett Sale(Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 TG Barnett Resources, LP [Member] Barnett Shale [Member]	Mar. 28, 2013 TG Barnett Resources, LP [Member] Barnett Shale [Member]	Mar. 31, 2013 Subsequent Event [Member] TG Barnett Resources, LP [Member] Barnett Shale [Member]	Mar. 28, 2013 Subsequent Event [Member] TG Barnett Resources, LP [Member] Barnett Shale [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from Sale of Productive Assets			$ 485,000,000
Percentage of ownership interest				25.00%		25.00%
Cash received from sale of productive assets					463,400,000
Recognized gain	$ 0	$ 41,097,000			$ 300,000,000

The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

The cash inflow associated with the amount received from the sale of a business segment or subsidiary or sale of an entity that is related to it but not strictly controlled during the period (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).

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