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Summarized Financial Information Concerning Segments (Parenthetical) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information
Impairment	$ 164,779,000	$ 0
Permian Properties
Segment Reporting Information
Gain (loss) on sale of oil and gas property		(399,100,000)
Exploration and Production
Segment Reporting Information
Impairment	164,779,000
Exploration and Production | Permian Properties
Segment Reporting Information
Gain (loss) on sale of oil and gas property		$ (399,100,000)

X

- Definition

Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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X

- Details

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X

- Definition

The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 10

-Paragraph c

-Subparagraph 4(ii)

-Article 4

+ Details

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