Business Segment Information (Schedule Of Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Segment margin	$ 140,710	$ 94,790	$ 333,398	$ 254,822
Capital Expenditures	1,622,750	139,877	1,856,111	382,779
External customers	572,334	964,114	1,755,518	2,998,882
Intersegment	0	0	0	0
Total revenues	572,334	964,114	1,755,518	2,998,882
Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin	14,984	15,354	43,670	46,574
Capital Expenditures	45,933	11,340	155,417	39,081
External customers	16,735	15,715	48,422	50,454
Intersegment	3,174	4,634	9,488	12,538
Total revenues	19,909	20,349	57,910	62,992
Offshore Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin	70,943	21,666	121,241	46,504
Capital Expenditures	1,520,268	23,949	1,522,407	37,525
External customers	61,388	974	63,436	2,443
Intersegment	0	0	0	0
Total revenues	61,388	974	63,436	2,443
Refinery Services [Member]
Segment Reporting Information [Line Items]
Segment margin	20,692	21,855	60,073	64,354
Capital Expenditures	118	1,254	1,568	2,153
External customers	45,738	53,930	142,959	166,589
Intersegment	(2,406)	(2,722)	(7,179)	(8,387)
Total revenues	43,332	51,208	135,780	158,202
Marine Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin	26,583	22,077	79,501	61,512
Capital Expenditures	12,489	14,987	40,151	63,023
External customers	58,490	53,901	173,733	156,883
Intersegment	2,046	3,099	6,768	12,358
Total revenues	60,536	57,000	180,501	169,241
Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Segment margin	7,508	13,838	28,913	35,878
Capital Expenditures	43,942	88,347	136,568	240,997
External customers	389,983	839,594	1,326,968	2,622,513
Intersegment	(2,814)	(5,011)	(9,077)	(16,509)
Total revenues	387,169	834,583	1,317,891	2,606,004
Sekco [Member] | Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	$ 700	$ 23,400	$ 2,500	$ 36,100