Business Segment Information (Schedule Of Segment Information) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Segment Reporting Information [Line Items]
Segment margin	$ 60,252,000	[1]	$ 49,155,000	[1]
Capital expenditures	288,169,000	[2]	1,036,000	[2]
External customers	932,943,000		689,798,000
Total revenues	932,943,000		689,798,000
Acquisition of interests	205,600,000
Share of construction costs in joint ventures	33,542,000		194,000
Barge Assets [Member]
Segment Reporting Information [Line Items]
Capital expenditures	30,600,000
Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin	25,347,000	[1]	17,682,000	[1]
Capital expenditures	246,428,000	[2]	448,000	[2]
External customers	14,976,000		12,593,000
Intersegment	4,433,000	[3]	1,862,000	[3]
Total revenues	19,409,000		14,455,000
Refinery Services [Member]
Segment Reporting Information [Line Items]
Segment margin	17,249,000	[1]	17,948,000	[1]
Capital expenditures	910,000	[2]	280,000	[2]
External customers	50,373,000		49,583,000
Intersegment	(2,328,000)	[3]	(2,037,000)	[3]
Total revenues	48,045,000		47,546,000
Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Segment margin	17,656,000	[1]	13,525,000	[1]
Capital expenditures	40,831,000	[2]	308,000	[2]
External customers	867,594,000		627,622,000
Intersegment	(2,105,000)	[3]	175,000	[3]
Total revenues	$ 865,489,000		$ 627,797,000

[1] A reconciliation of Segment Margin to income before income taxes for the periods presented is as follows:

[2] Capital expenditures include fixed asset additions and acquisitions of businesses and equity investees. For the three months ended March 31, 2012, capital spending in our Pipeline Transportation segment included $205.6 million for the acquisition of interests in several Gulf of Mexico pipelines and $33.5 million for our share of construction costs in connection with our joint venture in the planned SEKCO pipeline. Capital spending in our Supply & Logistics segment included $30.6 million for the purchase of barge assets during the three months ended March 31, 2012.

[3] Intersegment sales were conducted on an arm's length basis.