Business Segment Information (Schedule Of Total Assets By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total consolidated assets	$ 3,112,612	$ 2,862,202
Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	1,114,347	1,075,235
Refinery Services [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	407,618	417,121
Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	1,520,281	1,312,461
Other Assets [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	$ 70,366	$ 57,385