Business Segment Information (Schedule Of Total Assets By Reportable Segment) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total consolidated assets	$ 5,449,245	$ 3,230,374
Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	552,920	460,012
Offshore Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	2,661,783	645,668
Refinery Services [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	395,291	403,703
Marine Transportation [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	752,116	745,128
Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	995,589	907,189
Other Assets [Member]
Segment Reporting Information [Line Items]
Total consolidated assets	$ 91,546	$ 68,674