Business Segment Information (Schedule Of Segment Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Segment Reporting Information [Line Items]
Segment margin									$ 262,333	[1]	$ 202,501	[1]	$ 149,564	[1]
Capital expenditures									426,298	[2]	186,994	[2]	336,730	[2]
External customers									4,070,057		3,089,669		2,101,324
Intersegment									0	[3]	0	[3]	0	[3]
Total revenues	1,054,072	1,041,837	1,013,431	960,717	806,881	830,200	762,790	689,798	4,070,057		3,089,669		2,101,324
Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin									96,539	[1]	67,908	[1]	48,305	[1]
Capital expenditures									328,710	[2]	14,501	[2]	333,557	[2]
External customers									61,706		50,391		45,367
Intersegment									14,584	[3]	11,799	[3]	10,285	[3]
Total revenues									76,290		62,190		55,652
Refinery Services [Member]
Segment Reporting Information [Line Items]
Segment margin									72,883	[1]	74,618	[1]	62,923	[1]
Capital expenditures									2,692	[2]	1,846	[2]	1,433	[2]
External customers									205,110		210,394		158,456
Intersegment									(9,093)	[3]	(8,683)	[3]	(7,396)	[3]
Total revenues									196,017		201,711		151,060
Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Segment margin									92,911	[1]	59,975	[1]	38,336	[1]
Capital expenditures									94,896	[2]	170,647	[2]	1,740	[2]
External customers									3,803,241		2,828,884		1,897,501
Intersegment									(5,491)	[3]	(3,116)	[3]	(2,889)	[3]
Total revenues									3,797,750		2,825,768		1,894,612
SEKCO [Member] | Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Capital expenditures									63,700
Gulf Of Mexico Crude Oil Pipelines [Member] | Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Capital expenditures									205,600
Barge Assets [Member] | Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Capital expenditures									$ 30,900

[1] A reconciliation of Segment Margin to income (loss) before income taxes for each year presented is as follows: Year Ended December 31, 2012 2011 2010Segment margin$262,333 $202,501 $149,564Corporate general and administrative expenses(38,372) (31,685) (110,058)Depreciation, amortization and impairment(61,166) (62,190) (53,569)Interest expense(40,921) (35,767) (22,924)Distributable cash from equity investees in excess of equity in earnings(24,464) (16,681) (2,284)Non-cash items not included in segment margin(5,280) (1,531) (4,479)Cash payments from direct financing leases in excess of earnings(5,016) (4,615) (4,203)Income (loss) before income taxes$87,114 $50,032 $(47,953)

[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 $63.7 million during the year ended December 31, 2012 representing capital contributions to our SEKCO equity investee to fund our share of the construction costs for its pipeline. During the same period, capital spending in our pipeline transportation segment also included $205.6 million for the acquisition of interests in several Gulf of Mexico pipelines. During 2012, capital spending in our supply and logistics segment also included $30.9 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.