Business Segment Information (Schedule Of Total Assets By Reportable Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total Conolidated Assets	$ 5,459,599	$ 3,210,624	$ 2,848,528
Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Total Conolidated Assets	614,484	460,012	437,912
Offshore Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Total Conolidated Assets	2,623,478	645,668	637,323
Refinery Services [Member]
Segment Reporting Information [Line Items]
Total Conolidated Assets	394,626	403,703	417,121
Marine Transportation [Member]
Segment Reporting Information [Line Items]
Total Conolidated Assets	777,952	745,128	529,914
Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Total Conolidated Assets	1,000,851	907,189	782,547
Other Assets [Member]
Segment Reporting Information [Line Items]
Total Conolidated Assets	$ 48,208	$ 48,924	$ 43,711