Business Segment Information (Schedule Of Total Assets By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total consolidated assets	$ 2,070,275	$ 1,730,844
Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	836,924	594,728
Refinery Services [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	420,039	426,993
Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	762,686	659,576
Other Assets [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	$ 50,626	$ 49,547