Segment Disclosures (Schedule Of Business Segment Reporting Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Transportation and terminals revenues	$ 217,554	$ 205,408
Product sales revenues	275,730	237,296
Affiliate management fee revenue	199	193
Total revenues	493,483	442,897
Operating expenses	68,452	62,361
Product purchases	248,612	211,230
Equity earnings	(1,648)	(1,367)
Operating margin	178,067	170,673
Depreciation and amortization expense	31,510	29,363
G&A expenses	23,744	24,590
Operating profit	122,813	116,720
Petroleum Pipeline System [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenues	148,730	144,062
Product sales revenues	266,257	226,988
Affiliate management fee revenue	199	193
Total revenues	415,186	371,243
Operating expenses	46,554	37,710
Product purchases	244,881	208,473
Equity earnings	(1,669)	(1,367)
Operating margin	125,420	126,427
Depreciation and amortization expense	19,663	18,552
G&A expenses	17,455	18,455
Operating profit	88,302	89,420
Petroleum Terminals [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenues	63,180	55,221
Product sales revenues	9,765	10,418
Total revenues	72,945	65,639
Operating expenses	20,182	21,996
Product purchases	4,728	3,774
Equity earnings	21
Operating margin	48,014	39,869
Depreciation and amortization expense	10,729	9,771
G&A expenses	5,666	5,471
Operating profit	31,619	24,627
Ammonia Pipeline System [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenues	6,349	7,032
Total revenues	6,349	7,032
Operating expenses	2,450	3,331
Operating margin	3,899	3,701
Depreciation and amortization expense	384	364
G&A expenses	623	664
Operating profit	2,892	2,673
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenues	(705)	(907)
Product sales revenues	(292)	(110)
Total revenues	(997)	(1,017)
Operating expenses	(734)	(676)
Product purchases	(997)	(1,017)
Operating margin	734	676
Depreciation and amortization expense	$ 734	$ 676