Transactions With Related Parties (Schedule Of Transactions With Related Parties) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Robertson Group [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses	$ 2,244	[1]	$ 780	[1]	$ 4,201	[1]	$ 1,820	[1]
Related party transaction, revenues	4,578	[1]	11,533	[1]	14,766	[1]	21,254	[1]
Sandhill Group, LLC [Member]
Related Party Transaction [Line Items]
Related party transaction, revenues	660	[2]	432	[2]	1,273	[2]	975	[2]
Davison [Member]
Related Party Transaction [Line Items]
Related party transaction, revenues	374	[1]	245	[1]	686	[1]	487	[1]
Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses	$ 150		$ 0		$ 300		$ 0
Genesis Energy Interest In Sandhill Group, LLC [Member]
Related Party Transaction [Line Items]
Percentage of interest held	50.00%				50.00%
Class A [Member] | Robertson Group [Member]
Related Party Transaction [Line Items]
Percentage of common units owned by affiliated companies					9.00%
Class A [Member] | Davison [Member]
Related Party Transaction [Line Items]
Percentage of common units owned by affiliated companies					15.00%
Class B [Member] | Robertson Group [Member]
Related Party Transaction [Line Items]
Percentage of common units owned by affiliated companies					74.00%

[1] The Robertson Group owned 9% of our Class A common units and 74% of our Class B common units at June 30, 2012. The Davison family owned 15% of our Class A common units at June 30, 2012.

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