Business Segment Information (Schedule Of Total Assets By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total consolidated assets	$ 2,275,283	$ 2,109,664
Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	964,906	890,652
Refinery Services [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	415,088	414,170
Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	837,426	750,347
Other Assets [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	$ 57,863	$ 54,495