Segment Disclosures (Segment Reporting Information By Segment) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Segment Reporting Information [Line Items]
Transportation and terminals revenues	$ 232,064	$ 206,727	$ 660,664	$ 573,069
Product sales revenues	203,253	199,284	600,492	585,318
Affiliate management fee revenue	193	190	578	569
Total revenues	435,510	406,201	1,261,734	1,158,956
Operating expenses	89,458	87,584	233,142	219,980
Product purchases	159,550	186,993	489,616	503,516
Equity earnings	(1,955)	(1,654)	(4,765)	(4,323)
Operating margin (loss)	188,457	133,278	543,741	439,783
Depreciation and amortization expense	30,234	27,403	90,261	79,460
G&A expenses	20,470	23,624	70,341	67,044
Operating profit	137,753	82,251	383,139	293,279
Total assets	4,006,698		4,006,698		3,717,900
Petroleum Pipeline System [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenues	167,500	156,652	472,730	421,028
Product sales revenues	197,932	195,177	577,811	570,366
Affiliate management fee revenue	193	190	578	569
Total revenues	365,625	352,019	1,051,119	991,963
Operating expenses	61,075	56,941	150,522	149,211
Product purchases	157,356	186,023	483,369	499,066
Equity earnings	(1,954)	(1,654)	(4,764)	(4,323)
Operating margin (loss)	149,148	110,709	421,992	348,009
Depreciation and amortization expense	18,945	17,840	56,788	51,200
G&A expenses	15,162	16,965	52,400	48,307
Operating profit	115,041	75,904	312,804	248,502
Total assets	2,702,501		2,702,501
Petroleum Terminals [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenues	60,621	49,905	172,811	144,010
Product sales revenues	5,887	4,233	23,445	15,106
Total revenues	66,508	54,138	196,256	159,116
Operating expenses	22,780	23,044	71,403	57,679
Product purchases	3,461	1,597	9,319	6,120
Equity earnings	(1)		(1)
Operating margin (loss)	40,268	29,497	115,535	95,317
Depreciation and amortization expense	10,179	8,562	30,193	24,809
G&A expenses	4,743	6,033	16,052	16,911
Operating profit	25,346	14,902	69,290	53,597
Total assets	1,042,325		1,042,325
Ammonia Pipeline System [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenues	4,644	671	17,431	9,547
Total revenues	4,644	671	17,431	9,547
Operating expenses	6,349	8,242	13,406	15,458
Operating margin (loss)	(1,705)	(7,571)	4,025	(5,911)
Depreciation and amortization expense	364	358	1,091	1,083
G&A expenses	565	626	1,889	1,826
Operating profit	(2,634)	(8,555)	1,045	(8,820)
Total assets	36,790		36,790
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenues	(701)	(501)	(2,308)	(1,516)
Product sales revenues	(566)	(126)	(764)	(154)
Total revenues	(1,267)	(627)	(3,072)	(1,670)
Operating expenses	(746)	(643)	(2,189)	(2,368)
Product purchases	(1,267)	(627)	(3,072)	(1,670)
Operating margin (loss)	746	643	2,189	2,368
Depreciation and amortization expense	746	643	2,189	2,368
Segment Assets [Member]
Segment Reporting Information [Line Items]
Total assets	3,781,616		3,781,616
Corporate Assets [Member]
Segment Reporting Information [Line Items]
Total assets	$ 225,082		$ 225,082