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Business Segment Information - Summarized Financial Information Concerning Segments (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information
Full cost ceiling limitation impairment	$ 1,500,000		$ 2,600,000	$ 164,800
Impairment	1,489,391	$ 3,133	2,573,257	167,912
Exploration and Production
Segment Reporting Information
Full cost ceiling limitation impairment	1,500,000		2,600,000	164,800
Drilling and Oil Field Services
Segment Reporting Information
Impairment		$ 3,100		$ 3,100
Assets classified as held-for-sale	$ 20,000		$ 20,000

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 360



-SubTopic 10



-Section 45



-Paragraph 4



-URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228



Reference 2: 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=56944662&loc=d3e3602-108585

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X

- Definition

Amount of other assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 360



-SubTopic 10



-Section 15



-Paragraph 4



-Subparagraph (b)(2)



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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.

+ References

No definition available.

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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 FASB



-Name Accounting Standards Codification



-Topic 932



-SubTopic 360



-Section S99



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=27015634&loc=d3e516453-122869



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 10



-Paragraph c



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-Article 4

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