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Acquisitions (Schedule Of Consideration Paid And The Fair Value Of The Assets Acquired And Liabilities Assumed) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2009	Jun. 15, 2009
Kerogen Acquisition [Member]
Business Acquisition [Line Items]
Cash		$ 27,087
Total identifiable net assets		27,087
Fidelity Acquisition [Member]
Business Acquisition [Line Items]
Cash	10,681
Total identifiable net assets	10,681
Proved [Member]
Business Acquisition [Line Items]
Recognized amounts of identifiable assets and liabilities assumed	4,668	25,178
Proved Undeveloped [Member]
Business Acquisition [Line Items]
Recognized amounts of identifiable assets and liabilities assumed	2,415	1,647
Unproved [Member]
Business Acquisition [Line Items]
Recognized amounts of identifiable assets and liabilities assumed	3,450	360
Seismic Costs [Member]
Business Acquisition [Line Items]
Seismic costs	667	667
Asset Retirement Obligations [Member]
Business Acquisition [Line Items]
Asset retirement obligations	$ 519	$ 765

X

- Definition

Amount of cash paid to acquire the entity.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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X

- Definition

The amount of acquisition cost of a business combination allocated to net tangible assets.

+ References

No definition available.

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X

- Definition

The amount of financial liabilities assumed (as defined) which have been recognized as of the acquisition date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financial Liability

-URI http://asc.fasb.org/extlink&oid=6513127



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-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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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

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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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-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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- Definition

The amount of property, plant, and equipment recognized as of the acquisition date.

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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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-Publisher FASB

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-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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