Business Segment Information (Schedule Of Segment Information) (Details) (USD $)	3 Months Ended				9 Months Ended				3 Months Ended	9 Months Ended		3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012 S E K C O [Member]	Sep. 30, 2012 S E K C O [Member]	Sep. 30, 2012 Barge Assets [Member]	Sep. 30, 2012 Pipeline Transportation [Member]		Sep. 30, 2011 Pipeline Transportation [Member]		Sep. 30, 2012 Pipeline Transportation [Member]		Sep. 30, 2011 Pipeline Transportation [Member]		Sep. 30, 2012 Refinery Services [Member]		Sep. 30, 2011 Refinery Services [Member]		Sep. 30, 2012 Refinery Services [Member]		Sep. 30, 2011 Refinery Services [Member]		Sep. 30, 2012 Supply And Logistics [Member]		Sep. 30, 2011 Supply And Logistics [Member]		Sep. 30, 2012 Supply And Logistics [Member]		Sep. 30, 2011 Supply And Logistics [Member]		Jan. 03, 2012 Gulf Of Mexico Crude Oil Pipeline Systems [Member]
Segment Reporting Information [Line Items]
Segment margin	$ 65,929,000	[1]	$ 52,931,000	[1]	$ 189,012,000	[1]	$ 149,759,000	[1]				$ 23,295,000	[1]	$ 16,030,000	[1]	$ 69,427,000	[1]	$ 50,639,000	[1]	$ 18,983,000	[1]	$ 17,992,000	[1]	$ 53,510,000	[1]	$ 54,887,000	[1]	$ 23,651,000	[1]	$ 18,909,000	[1]	$ 66,075,000	[1]	$ 44,233,000	[1]
Capital expenditures	37,199,000	[2]	149,433,000	[2]	379,802,000	[2]	153,711,000	[2]	5,700,000	57,100,000	30,600,000	21,764,000	[2]	1,582,000	[2]	300,093,000	[2]	3,264,000	[2]	1,025,000	[2]	852,000	[2]	2,295,000	[2]	1,321,000	[2]	14,410,000	[2]	146,999,000	[2]	77,414,000	[2]	149,126,000	[2]
External customers	942,334,000		830,200,000		2,797,945,000		2,282,788,000					16,190,000		12,658,000		44,564,000		37,302,000		50,378,000		50,982,000		151,326,000		151,899,000		875,766,000		766,560,000		2,602,055,000		2,093,587,000
Intersegment	0	[3]	0	[3]	0	[3]	0	[3]				2,974,000	[3]	3,436,000	[3]	11,230,000	[3]	8,331,000	[3]	(2,401,000)	[3]	(2,590,000)	[3]	(6,984,000)	[3]	(6,598,000)	[3]	(573,000)	[3]	(846,000)	[3]	(4,246,000)	[3]	(1,733,000)	[3]
Total revenues	942,334,000		830,200,000		2,797,945,000		2,282,788,000					19,164,000		16,094,000		55,794,000		45,633,000		47,977,000		48,392,000		144,342,000		145,301,000		875,193,000		765,714,000		2,597,809,000		2,091,854,000
Acquisition of interests																																				$ 205,600,000

[1] A reconciliation of Segment Margin to income before income taxes for the periods presented is as follows: Three Months EndedSeptember 30, Nine Months EndedSeptember 30, 2012 2011 2012 2011Segment Margin$65,929 $52,931 $189,012 $149,759Corporate general and administrative expenses(9,428) (8,194) (26,756) (23,267)Depreciation and amortization(14,838) (14,706) (45,447) (43,100)Interest expense(9,873) (8,960) (30,697) (26,670)Distributable cash from equity investees in excess of equity in earnings(5,613) (3,701) (19,098) (11,925)Non-cash items not included in segment margin(2,222) 3,061 (2,475) 2,729Cash payments from direct financing leases in excess of earnings(1,278) (1,171) (3,748) (3,424)Income before income taxes$22,677 $19,260 $60,791 $44,102

[2] Capital expenditures include maintenance and growth capital expenditures, such as fixed asset additions (including enhancements to existing facilities and construction of internal growth projects) as well as acquisitions of businesses and interests in equity investees. Capital spending in our pipeline transportation segment included $5.7 million and $57.1 million during the three and nine months ended September 30, 2012, respectively, representing capital contributions to our SEKCO equity investee to fund our share of the construction costs for its pipeline. For the nine months ended September 30, 2012, capital spending in our pipeline transportation segment also included $205.6 million for the acquisition of interests in several Gulf of Mexico pipelines. For the nine months ended September 30, 2012, capital spending in our supply and logistics segment also included $30.6 million for the purchase of barge assets

[3] Intersegment sales were conducted under terms that we believe were no more or less favorable than then-existing market conditions.