Business Segment Information (Schedule Of Total Assets By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total consolidated assets	$ 2,000,350	$ 1,730,844
Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	856,418	594,728
Refinery Services [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	418,050	426,993
Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	674,834	659,576
Other Assets [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	$ 51,048	$ 49,547