Transactions With Related Parties (Schedule Of Transactions With Related Parties) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended		9 Months Ended			9 Months Ended	0 Months Ended	9 Months Ended		0 Months Ended
	Sep. 30, 2012 Quintana Group [Member]		Sep. 30, 2011 Quintana Group [Member]		Sep. 30, 2012 Quintana Group [Member]		Sep. 30, 2011 Quintana Group [Member]		Sep. 30, 2012 Sandhill Group, LLC [Member]		Sep. 30, 2011 Sandhill Group, LLC [Member]		Sep. 30, 2012 Sandhill Group, LLC [Member]		Sep. 30, 2011 Sandhill Group, LLC [Member]		Sep. 30, 2012 Davison [Member]		Sep. 30, 2011 Davison [Member]		Sep. 30, 2012 Davison [Member]		Sep. 30, 2011 Davison [Member]		Sep. 30, 2012 Chief Executive Officer [Member]	Sep. 30, 2011 Chief Executive Officer [Member]	Sep. 30, 2012 Chief Executive Officer [Member]	Sep. 30, 2011 Chief Executive Officer [Member]	Sep. 30, 2012 Genesis Energy Interest In Sandhill Group, LLC [Member]	Sep. 30, 2012 Class A [Member] Quintana Group [Member]	Oct. 06, 2012 Class A [Member] Davison [Member]	Sep. 30, 2012 Class A [Member] Davison [Member]	Sep. 30, 2012 Class B [Member] Quintana Group [Member]	Oct. 06, 2012 Class B [Member] Davison [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses	$ 1,980	[1]	$ 902	[1]	$ 6,181	[1]	$ 2,722	[1]																	$ 150	$ 166	$ 450	$ 166
Related party transaction, revenues	$ 6,376	[1]	$ 5,948	[1]	$ 21,142	[1]	$ 27,202	[1]	$ 838	[2]	$ 946	[2]	$ 2,111	[2]	$ 1,921	[2]	$ 326	[1]	$ 737	[1]	$ 1,012	[1]	$ 1,224	[1]
Percentage of common units owned by affiliated companies																														10.00%	17.20%	15.00%	74.00%	76.90%
Percentage of interest held																													50.00%

[1] The Quintana Group, a private equity fund based in Houston, Texas, owned 10% of our Class A common units and 74% of our Class B common units at September 30, 2012. The Davison family owned 15% of our Class A common units at September 30, 2012. The Quintana Group monetized all of its remaining investment in us on October 5, 2012. Substantially in connection with that transaction, certain members of the Davison family, collectively, increased their investment in us to 17.2% of our Class A common units and 76.9% of our Class B units. Soley for financial statement disclosure purposes, we will continue to treat the Davison family and their affiliates as related parties.

[2] We own a 50% interest in Sandhill Group, LLC.