General Information (Unaudited) (Details)	6 Months Ended
	Jun. 30, 2013
Plains Exploration & Production Company [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	May 31, 2013
McMoRan Exploration Co [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Jun. 03, 2013