Conveyance of undivided interest in assets and related well plugging and abandonment obligations.

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- Definition

Percentage of annual discount rate for future cash flows.

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- Definition

Twelve month average price on the basis of which gas price is estimated.

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- Definition

Twelve month average price on the basis of which oil price is estimated.

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- Definition

Production costs incurred in lifting the oil and gas to the surface during the reporting period divided by the number of barrels of oil equivalents (BOE) produced. Production (or lifting costs) are costs incurred in lifting the oil and gas to the surface and generally include gathering, treating, primary processing, field storage, property taxes and insurance on proved properties, but do not include depreciation, depletion, accretion, amortization, royalties, income taxes, interest, general and administrative and other expenses.

+ References

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

-Publisher SEC

-Name Industry Guide

-Number 2

-Paragraph 3

-Subparagraph A

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- Definition

The revenues derived from sales of oil or gas in each geographic area during the reporting period divided by the number of barrels of oil produced or thousands of cubic feet of gas produced.

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

-Publisher SEC

-Name Industry Guide

-Number 2

-Paragraph 3

-Subparagraph A

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- Definition

Percentage of voting equity interests acquired in the business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Supplementary Oil And Natural Gas Disclosures (Unaudited) (Narrative) (Details) (Imported)	12 Months Ended						12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011	Jan. 31, 2010 Shell Offshore Inc [Member]	Jan. 31, 2010 Dynamic Offshore [Member]	Dec. 31, 2012 Equity Method Investments [Member]	Dec. 31, 2012 Equity Method Investments [Member]	Dec. 31, 2011 Equity Method Investments [Member]	Dec. 31, 2011 Equity Method Investments [Member]
Supplementary Oil And Natural Gas Disclosures [Line Items]
Average sales prices	108.79	3.45	77.04	5.00			4.40	113.28	4.78	79.21
Average production costs	12.51	12.51	19.99	19.99			26.30	26.30	25.35	25.35
Percentage of annual discount rate for future cash flows	10.00%	10.00%
Supplementary Oil and Natural Gas Disclosures (Textual) [Abstract]
Percentage of ownership acquired by Wild Well in Shell Offshore Inc.'s Gulf of Mexico Bullwinkle platform					100.00%
Conveyance of undivided interest in assets and related well plugging and abandonment obligations						49.00%
Twelve month average price on the basis of which oil price is estimated	96.19	96.19	79.40	79.40
Twelve month average price on the basis of which gas price is estimated	4,118,000	4,118,000	4,380,000	4,380,000