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.

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- Definition

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

+ References

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ 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)

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-Topic 350

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-Section 50

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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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 360

-Section S99

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 10

-Paragraph c

-Subparagraph 4(ii)

-Article 4

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Business Segment Information - Summarized Financial Information Concerning Segments (Additional Information) (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2014	Jun. 30, 2014
Segment Reporting Information [Line Items]
Full cost ceiling impairments	$ 164,800,000	$ 0	$ 0
Goodwill impairment loss			235,400,000us-gaap_GoodwillImpairmentLoss
Asset impairment charges	192,768,000us-gaap_AssetImpairmentCharges	26,280,000us-gaap_AssetImpairmentCharges	316,004,000us-gaap_AssetImpairmentCharges
Gas Treating Plants and other Midstream Assets
Segment Reporting Information [Line Items]
Asset impairment charges	600,000	12,200,000		10,000,000	2,100,000
Corporate Asset
Segment Reporting Information [Line Items]
Asset impairment charges		2,900,000			2,900,000
Permian Properties
Segment Reporting Information [Line Items]
Gain (loss) on sale of oil and gas property		(398,900,000)				(398,900,000)
Exploration and Production
Segment Reporting Information [Line Items]
Full cost ceiling impairments	164,800,000						164,800,000
Goodwill impairment loss			235,400,000
Exploration and Production \| Permian Properties
Segment Reporting Information [Line Items]
Gain (loss) on sale of oil and gas property		(398,900,000)
Drilling and Oil Field Services
Segment Reporting Information [Line Items]
Asset impairment charges	27,400,000	11,100,000						24,300,000	3,100,000
Midstream Services \| Gas Treating Plants and other Midstream Assets
Segment Reporting Information [Line Items]
Asset impairment charges	600,000	3,900,000	59,700,000
All Other \| Corporate Asset
Segment Reporting Information [Line Items]
Asset impairment charges		2,900,000
All Other \| CO2 Compression Facilities
Segment Reporting Information [Line Items]
Asset impairment charges		$ 8,300,000	$ 19,600,000