Transactions With Related Parties (Schedule Of Transactions With Related Parties) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Robertson Group [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses	$ 3,568	[1]	$ 2,443	[1],[2]
Related party transaction, revenues	20,888	[1]	3,740	[1],[2]
Davision [Member]
Related Party Transaction [Line Items]
Related party transaction, revenues	1,207	[1]	1,081	[1],[2]	757	[1]
Sandhill [Member]
Related Party Transaction [Line Items]
Related party transaction, revenues	2,481	[3]	2,706	[2],[3]	2,867	[3]
General Partners [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses			47,035	[2],[4]	50,417	[4]
Pipeline Transportation And Supply And Logistics Services [Member] | Denbury [Member]
Related Party Transaction [Line Items]
Related party transaction, revenues			3,059	[2]	35,957
Supply and Logistics Products And Services [Member] | Denbury [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses			$ 373	[2]	$ 7,229
Class A [Member] | Robertson Group [Member]
Related Party Transaction [Line Items]
Percentage of equity interest	12.00%
Class A [Member] | Davision [Member]
Related Party Transaction [Line Items]
Percentage of equity interest	18.00%
Class B [Member] | Robertson Group [Member]
Related Party Transaction [Line Items]
Percentage of equity interest	74.00%
Sandhill Group, LLC [Member]
Related Party Transaction [Line Items]
Percentage of equity interest	50.00%

[1] The Robertson Group owned 12% of our Class A Units and 74% of our Class B Units at December 31, 2011. The Davison family owned 18% of our Class A Units at December 31, 2011.

[2] Affiliates of Denbury Resources, Inc. sold its interests in our general partner in February 2010. Transactions with Denbury are included in the table as a related party through that date.

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

[4] Our general partner became a wholly-owned subsidiary in December 2010.