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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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- Details
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- 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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