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Dispositions (Details) (USD $)	6 Months Ended	1 Months Ended
	Jun. 30, 2011	Jul. 31, 2011 Big Sandy Pipeline	Feb. 28, 2011 Langley
Equity in Nonconsolidated Investments.
Net proceeds from sale of business		$ 390,000,000
Current natural gas carrying capacity (in dth per day)		171,000
Net proceeds after purchase price adjustments			230,500,000
Pre-tax gain on sale of business	$ 22,785,000		$ 22,785,000

X

- Definition

Represents the per day carrying capacity of the pipeline transporting the natural gas.

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X

- Definition

The difference between the sale price or salvage price and the book value of a property, plant, and equipment asset that was sold or retired during the reporting period. This element refers to the gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28

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X

- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 15, 16

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- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 15

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 16
-Subparagraph c

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- 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.

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