Product Sales Revenues (Disclosure Of Product Sales Revenues) (Details) (USD $) In Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Product Sales Revenue [Line Items]
Physical sale of petroleum products	$ 173,181		$ 206,682		$ 606,603		$ 577,919
Total NYMEX contract adjustments	30,072		(7,398)		(6,111)		7,399
Total product sales revenues	203,253		199,284		600,492		585,318
Petroleum Products Blending And Fractionation Activities [Member]
Product Sales Revenue [Line Items]
Total NYMEX contract adjustments	21,865		(3,279)		807		2,599
Houston-To-El Paso Pipeline Section Line Fill And Working Inventory [Member]
Product Sales Revenue [Line Items]
Total NYMEX contract adjustments	8,281	[1]	(4,924)	[1]	(6,918)	[1]	3,995	[1]
Crude Oil Activities [Member]
Product Sales Revenue [Line Items]
Total NYMEX contract adjustments	$ (74)		$ 805				$ 805

[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 inventory in current assets on our consolidated balance sheets.