Transactions With Related Parties (Schedule Of Transactions With Related Parties) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Robertson Group [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses	$ 1,957	[1]	$ 1,040	[1]
Related party transaction, revenues	10,188	[1]	9,721	[1]
Sandhill Group, LLC [Member]
Related Party Transaction [Line Items]
Related party transaction, revenues	613	[2]	543	[2]
Davison [Member]
Related Party Transaction [Line Items]
Related party transaction, revenues	312	[1]	242	[1]
Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses	$ 150
Genesis Energy Interest In Sandhill Group, LLC [Member]
Related Party Transaction [Line Items]
Percentage of interest held	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	16.00%
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 March 31, 2012. The Davison family owned 16% of our Class A common units at March 31, 2012.

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