Inventory (Inventory) (Details) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Inventory [Line Items]
Total inventory	$ 257,120,000	$ 216,408,000
Refined Petroleum Products [Member]
Inventory [Line Items]
Total inventory	105,770,000	146,211,000
Lower-of-average-cost-or-market adjustments	2,300,000
Natural Gas Liquids [Member]
Inventory [Line Items]
Total inventory	91,354,000	27,982,000
Transmix [Member]
Inventory [Line Items]
Total inventory	49,524,000	32,277,000
Lower-of-average-cost-or-market adjustments	700,000
Crude Oil [Member]
Inventory [Line Items]
Total inventory	3,987,000	5,008,000
Additives [Member]
Inventory [Line Items]
Total inventory	$ 6,485,000	$ 4,930,000