Business Segment Information (Schedule Of Segment Information) (Details) - Business Acquisition, Acquiree [Domain] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Segment margin	$ 98,567	$ 82,681	$ 192,688	$ 160,032
Capital Expenditures	108,153	140,124	233,361	242,902
Pipeline Transportation Services Revenues	20,191	23,192	40,049	44,112
Refinery Services Revenues	46,324	52,801	92,448	106,994
Supply And Logistics Revenues	527,218	883,108	930,722	1,771,421
External customers	656,327	1,015,049	1,183,184	2,034,768
Intersegment	0	0	0	0
Total revenues	656,327	1,015,049	1,183,184	2,034,768
Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin	14,363	16,531	28,686	31,220
Capital Expenditures	40,893	3,845	109,484	27,741
External customers	15,856	19,236	31,687	34,739
Intersegment	3,077	3,434	6,314	7,904
Total revenues	18,933	22,670	38,001	42,643
Offshore Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin	25,100	11,435	50,298	24,838
Capital Expenditures	86	3,192	2,139	13,576
External customers	1,258	522	2,048	1,469
Intersegment	0	0	0	0
Total revenues	1,258	522	2,048	1,469
Refinery Services [Member]
Segment Reporting Information [Line Items]
Segment margin	20,221	21,627	39,381	42,499
Capital Expenditures	238	597	1,450	899
External customers	48,786	55,552	97,221	112,659
Intersegment	(2,462)	(2,751)	(4,773)	(5,665)
Total revenues	46,324	52,801	92,448	106,994
Marine Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin	27,225	18,978	52,918	39,435
Capital Expenditures	11,086	37,077	27,662	48,036
External customers	60,603	51,892	115,243	102,982
Intersegment	1,991	4,056	4,722	9,259
Total revenues	62,594	55,948	119,965	112,241
Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Segment margin	11,658	14,110	21,405	22,040
Capital Expenditures	55,850	95,413	92,626	152,650
External customers	529,824	887,847	936,985	1,782,919
Intersegment	(2,606)	(4,739)	(6,263)	(11,498)
Total revenues	527,218	883,108	930,722	1,771,421
Sekco [Member] | Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	$ 0	$ 2,300	$ 1,800	$ 12,700