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Acquisitions and Divestitures (Details Textuals) (USD $)	3 Months Ended				6 Months Ended			1 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Mar. 31, 2010	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Oct. 15, 2010 Riley Ridge [Member] Acres	May 31, 2010 Southern Assets [Member]	Mar. 31, 2010 Genesis Energy LP [Member]	Feb. 28, 2010 Genesis Energy LLC [Member]
Acquisitions and Divestitures (Textuals) [Abstract]
Value of Encore Merger			$ 4,800,000
Revenues recognized from current period acquisitions		200,600,000		260,900,000
Transaction and other costs	2,018,000	22,784,000			4,377,000	67,783,000
Working interest in business acquisition							42.50%
Acreage for CO2 rights at Riley Ridge							28,000
Business Acquisition, Percentage of CO2 rights in additional 28,000 acres							33.00%
Net Field Operating Income		137,800,000		180,700,000
Net proceeds from sale of interest in Genesis									79,000,000	84,000,000
Pre tax gain on sale of interest in Genesis	0	(28,000)			0	101,540,000
Gain on sale of interest in Genesis after tax			63,000,000
Proceeds from Sale of Oil and Gas Property and Equipment					$ 0	$ 881,344,000		$ 892,100,000