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Acquisitions and Divestitures - Gulf of Mexico Property Acquisitions - Final Valuation of Assets Acquired and Liabilities Assumed (Details) (Gulf of Mexico Properties, USD $)
In Thousands, unless otherwise specified
Jun. 20, 2012
Gulf of Mexico Properties
 
Consideration paid  
Cash, net of purchase price adjustments $ 43,282
Fair value of identifiable assets acquired and liabilities assumed  
Proved developed and undeveloped properties 98,725
Asset retirement obligation (55,443)
Total identifiable net assets $ 43,282