Business Segment Information (Schedule Of Total Assets By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total consolidated assets	$ 2,333,052	$ 2,109,664
Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	994,009	890,652
Refinery Services [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	419,137	414,170
Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	857,068	750,347
Other Assets [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	$ 62,838	$ 54,495