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Acquisitions (Summary Of Fair Value Of Assets Acquired And Liabilities Assumed ForPredessor's Melrose Acquisition) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2012	Oct. 03, 2011	Dec. 31, 2010 Melrose Acquisition [Member]
Business Acquisition [Line Items]
Oil and gas properties			$ 82,781
Asset retirement obligation	(34,261)	(26,294)	(5,018)
Net assets acquired	$ (45,578)	$ 249,331	$ 77,763

The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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