Acquisitions (Summary Of Fair Value Of Assets Acquired And Liabilities Assumed) (Details) (2013 East Texas Acquisition [Member], USD $) In Thousands, unless otherwise specified	Aug. 06, 2013
2013 East Texas Acquisition [Member]
Business Acquisition [Line Items]
Oil and gas properties	$ 103,821
Other assets	825
Investment in ETSWDC	9,576
Asset retirement obligation	(6,069)
Other current liabilities	(852)
Net assets acquired	$ 107,301

Business Acquisition, Purchase Price Allocation, Asset Retirement Obligation.

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- Definition

Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.

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

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- Definition

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

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

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Amount recognized as of the acquisition date for the assets, including goodwill, in excess of (less than) the aggregate liabilities assumed, less the noncontrolling interest in the acquiree.

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

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