Business Segment Information (Schedule Of Total Assets By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Total Conolidated Assets	$ 2,109,664	$ 1,730,844	$ 1,506,735
Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Total Conolidated Assets	890,652	594,728	606,980
Refinery Services [Member]
Segment Reporting Information [Line Items]
Total Conolidated Assets	414,170	426,993	422,351
Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Total Conolidated Assets	750,347	658,393	432,808
Other Assets [Member]
Segment Reporting Information [Line Items]
Total Conolidated Assets	$ 54,495	$ 50,730	$ 44,596