Segment Disclosures (Schedule Of Business Segment Reporting Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Transportation and terminals revenues	$ 248,761	$ 223,192	$ 466,315	$ 428,600
Product sales revenues	200,568	159,943	476,298	397,239
Affiliate management fee revenue	198	192	397	385
Total revenues	449,527	383,327	943,010	826,224
Operating expenses	82,326	81,323	150,778	143,684
Product purchases	144,498	118,836	393,110	330,066
Equity earnings	(1,478)	(1,443)	(3,126)	(2,810)
Operating margin	224,181	184,611	402,248	355,284
Depreciation and amortization expense	31,486	30,664	62,996	60,027
G&A expenses	25,414	25,281	49,158	49,871
Operating profit	167,281	128,666	290,094	245,386
Petroleum Pipeline System [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenues	178,757	161,168	327,487	305,230
Product sales revenues	193,040	152,891	459,297	379,879
Affiliate management fee revenue	198	192	397	385
Total revenues	371,995	314,251	787,181	685,494
Operating expenses	56,377	51,737	102,931	89,447
Product purchases	140,810	117,540	385,691	326,013
Equity earnings	(1,494)	(1,443)	(3,163)	(2,810)
Operating margin	176,302	146,417	301,722	272,844
Depreciation and amortization expense	19,875	19,291	39,538	37,843
G&A expenses	18,539	18,783	35,994	37,238
Operating profit	137,888	108,343	226,190	197,763
Petroleum Terminals [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenues	64,053	56,969	127,233	112,190
Product sales revenues	7,699	7,140	17,464	17,558
Total revenues	71,752	64,109	144,697	129,748
Operating expenses	24,440	26,627	44,622	48,623
Product purchases	4,567	2,084	9,295	5,858
Equity earnings	16		37
Operating margin	42,729	35,398	90,743	75,267
Depreciation and amortization expense	10,516	10,243	21,245	20,014
G&A expenses	6,189	5,838	11,855	11,309
Operating profit	26,024	19,317	57,643	43,944
Ammonia Pipeline System [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenues	6,659	5,755	13,008	12,787
Total revenues	6,659	5,755	13,008	12,787
Operating expenses	2,179	3,726	4,629	7,057
Operating margin	4,480	2,029	8,379	5,730
Depreciation and amortization expense	425	363	809	727
G&A expenses	686	660	1,309	1,324
Operating profit	3,369	1,006	6,261	3,679
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenues	(708)	(700)	(1,413)	(1,607)
Product sales revenues	(171)	(88)	(463)	(198)
Total revenues	(879)	(788)	(1,876)	(1,805)
Operating expenses	(670)	(767)	(1,404)	(1,443)
Product purchases	(879)	(788)	(1,876)	(1,805)
Operating margin	670	767	1,404	1,443
Depreciation and amortization expense	$ 670	$ 767	$ 1,404	$ 1,443