Inventory (Inventory) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Inventory [Line Items]
Total inventory	$ 215,667	$ 258,860
Refined Petroleum Products [Member]
Inventory [Line Items]
Total inventory	81,655	127,999
Natural Gas Liquids [Member]
Inventory [Line Items]
Total inventory	60,984	55,490
Transmix [Member]
Inventory [Line Items]
Total inventory	53,067	60,251
Crude Oil [Member]
Inventory [Line Items]
Total inventory	12,116	8,065
Additives [Member]
Inventory [Line Items]
Total inventory	$ 7,845	$ 7,055