Business Segment Information (Schedule Of Segment Information) (Details) (USD $)	3 Months Ended				6 Months Ended				3 Months Ended	6 Months Ended		3 Months Ended				6 Months Ended				3 Months Ended				6 Months Ended				3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012 S E K C O [Member]	Jun. 30, 2012 S E K C O [Member]	Jun. 30, 2012 Barge Assets [Member]	Jun. 30, 2012 Pipeline Transportation [Member]		Jun. 30, 2011 Pipeline Transportation [Member]		Jun. 30, 2012 Pipeline Transportation [Member]		Jun. 30, 2011 Pipeline Transportation [Member]		Jun. 30, 2012 Refinery Services [Member]		Jun. 30, 2011 Refinery Services [Member]		Jun. 30, 2012 Refinery Services [Member]		Jun. 30, 2011 Refinery Services [Member]		Jun. 30, 2012 Supply And Logistics [Member]		Jun. 30, 2011 Supply And Logistics [Member]		Jun. 30, 2012 Supply And Logistics [Member]		Jun. 30, 2011 Supply And Logistics [Member]		Jan. 03, 2012 Gulf Of Mexico Crude Oil Pipeline Systems [Member]
Segment Reporting Information [Line Items]
Segment margin	$ 62,831,000	[1]	$ 47,673,000	[1]	$ 123,083,000	[1]	$ 96,828,000	[1]				$ 20,785,000	[1]	$ 16,927,000	[1]	$ 46,132,000	[1]	$ 34,609,000	[1]	$ 17,278,000	[1]	$ 18,947,000	[1]	$ 34,527,000	[1]	$ 36,895,000	[1]	$ 24,768,000	[1]	$ 11,799,000	[1]	$ 42,424,000	[1]	$ 25,324,000	[1]
Capital expenditures	54,434,000	[2]	3,242,000	[2]	342,603,000	[2]	4,278,000	[2]	17,900,000	51,400,000	30,600,000	31,901,000	[2]	1,234,000	[2]	278,329,000	[2]	1,682,000	[2]	360,000	[2]	189,000	[2]	1,270,000	[2]	469,000	[2]	22,173,000	[2]	1,819,000	[2]	63,004,000	[2]	2,127,000	[2]
External customers	922,668,000		762,790,000		1,855,611,000		1,452,588,000					13,398,000		12,051,000		28,374,000		24,644,000		50,575,000		51,334,000		100,948,000		100,917,000		858,695,000		699,405,000		1,726,289,000		1,327,027,000
Intersegment	0	[3]	0	[3]	0	[3]	0	[3]				3,823,000	[3]	3,033,000	[3]	8,256,000	[3]	4,895,000	[3]	(2,255,000)	[3]	(1,971,000)	[3]	(4,583,000)	[3]	(4,008,000)	[3]	(1,568,000)	[3]	(1,062,000)	[3]	(3,673,000)	[3]	(887,000)	[3]
Total revenues	922,668,000		762,790,000		1,855,611,000		1,452,588,000					17,221,000		15,084,000		36,630,000		29,539,000		48,320,000		49,363,000		96,365,000		96,909,000		857,127,000		698,343,000		1,722,616,000		1,326,140,000
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 EndedJune 30, Six Months EndedJune 30, 2012 2011 2012 2011Segment Margin$62,831 $47,673 $123,083 $96,828Corporate general and administrative expenses(8,707) (7,689) (17,328) (15,073)Depreciation and amortization(15,357) (14,253) (30,392) (28,156)Net loss on disposal of surplus assets(473) (249) (217) (238)Interest expense(10,228) (9,011) (20,824) (17,710)Distributable cash from equity investees in excess of equity in earnings(6,752) (4,921) (13,485) (8,224)Non-cash items not included in segment margin(1,577) 7,103 (253) (331)Cash payments from direct financing leases in excess of earnings(1,249) (1,141) (2,470) (2,254)Income before income taxes$18,488 $17,512 $38,114 $24,842

[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. See Item 2. "Management's Discussion and Analysis of Financial Condition and Results of Operations - Liquidity and Capital Resources" for more information regarding our capital expenditures. Capital spending in our pipeline transportation segment included $17.9 million and $51.4 million during the three and six months ended June 30, 2012, respectively, representing capital contributions to our SEKCO equity investee to fund our share of the construction costs for its pipeline. For the six months ended June 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 and pipeline equity investees. For the six months ended June 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 no more or less favorable than then-existing market conditions.