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Acquisitions and Dispositions	12 Months Ended
Acquisitions and Dispositions	Dec. 31, 2012
Business Combinations [Abstract]
Acquisitions and Dispositions	Acquisitions and Dispositions In October 2011, we closed the sale of certain properties located in Louisiana, Texas and Alabama. The fields in Louisiana include Horseshoe Bayou/Bayou Sale, High Island, Bayou Penchant, Jeanerette and Cote Blanche Island. The Texas fields include Bego South and Briscoe Ranch. The Alabama field is Chunchula. As a result, the Company received sale proceeds of $48.8 million, net of $4.7 million in purchase price adjustments related to these properties. This sale also included the buyer's assumption of $27.7 million for asset retirement obligations on these properties. No gain or loss was recognized from this divestiture.