Product Sales Revenues (Disclosure of Product Sales Revenues) (Details) (USD $) In Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Physical sale of petroleum products	$ 157,793		$ 205,932		$ 433,422		$ 371,237
Total NYMEX contract adjustments	2,150		23,766		(36,183)		14,797
Total product sales revenues	159,943		229,698		397,239		386,034
Petroleum Products Blending and Fractionation Activities [Member]
Total NYMEX contract adjustments	(1,078)	[1]	10,195	[1]	(21,058)	[1]	5,878	[1]
Houston to El Paso Pipeline Section Line Fill and Working Inventory [Member]
Total NYMEX contract adjustments	3,228	[1]	13,571	[1]	(15,199)	[1]	8,919	[1]
Crude Oil Activities [Member]
Total NYMEX contract adjustments					$ 74

[1] The associated petroleum products for these activities are, to the extent still owned as of the statement date, or were, to the extent no longer owned as of the statement date, classified as inventories in current assets on our consolidated balance sheets.