Business Segment Information (Schedule Of Total Assets By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total consolidated assets	$ 2,857,553	$ 2,862,202
Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	1,098,205	1,075,235
Refinery Services [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	409,931	417,121
Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	1,290,226	1,312,461
Other Assets [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	$ 59,191	$ 57,385