Acquisitions (Summary Of Fair Value Of Assets Acquired And Liabilities Assumed For Prize Acquisition) (Details) (Prize [Member], USD $) In Thousands, unless otherwise specified	Apr. 20, 2012
Prize [Member]
Business Acquisition [Line Items]
Evaluated	$ 226,670
Unevaluated	6,100
Asset retirement obligation	(4,738)
Environmental liability	(1,891)
Other current liabilities	(993)
Net assets (liabilities) acquired	$ 225,148

Business Acquisition, Purchase Price Allocation, Asset Retirement Obligation.

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- Definition

Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Evaluated Oil and Gas Property

+ References

No definition available.

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- Definition

Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Unevaluated Oil and Gas Property

+ References

No definition available.

+ Details

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- Definition

The amount of liability arising from an inherited contingency (as defined) which has 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

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 55

-Paragraph 37

-URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464

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- Definition

Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

+ References

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- Definition

Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

+ References

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