Segment Disclosures (Segment Reporting Information by Segment) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Transportation and terminals revenues	$ 223,192	$ 193,173	$ 428,600	$ 366,342
Product sales revenues	159,943	229,698	397,239	386,034
Affiliate management fee revenue	192	189	385	379
Total revenues	383,327	423,060	826,224	752,755
Operating expenses	81,323	70,287	143,684	132,396
Product purchases	118,836	183,639	330,066	316,523
Equity earnings	(1,443)	(1,480)	(2,810)	(2,669)
Operating margin	184,611	170,614	355,284	306,505
Depreciation and amortization	30,664	25,715	60,027	52,057
G&A expenses	25,281	20,178	49,871	43,420
Operating profit (loss)	128,666	124,721	245,386	211,028
Petroleum Pipeline System [Member]
Transportation and terminals revenues	161,168	141,461	305,230	264,376
Product sales revenues	152,891	222,963	379,879	375,189
Affiliate management fee revenue	192	189	385	379
Total revenues	314,251	364,613	685,494	639,944
Operating expenses	51,737	49,450	89,447	92,270
Product purchases	117,540	182,267	326,013	313,043
Equity earnings	(1,443)	(1,480)	(2,810)	(2,669)
Operating margin	146,417	134,376	272,844	237,300
Depreciation and amortization	19,291	16,499	37,843	33,360
G&A expenses	18,783	14,490	37,238	31,342
Operating profit (loss)	108,343	103,387	197,763	172,598
Petroleum Terminals [Member]
Transportation and terminals revenues	56,969	48,446	112,190	94,105
Product sales revenues	7,140	6,763	17,558	10,873
Total revenues	64,109	55,209	129,748	104,978
Operating expenses	26,627	18,262	48,623	34,635
Product purchases	2,084	1,917	5,858	4,523
Operating margin	35,398	35,030	75,267	65,820
Depreciation and amortization	10,243	8,188	20,014	16,247
G&A expenses	5,838	5,104	11,309	10,878
Operating profit (loss)	19,317	21,738	43,944	38,695
Ammonia Pipeline System [Member]
Transportation and terminals revenues	5,755	3,783	12,787	8,876
Total revenues	5,755	3,783	12,787	8,876
Operating expenses	3,726	3,235	7,057	7,216
Operating margin	2,029	548	5,730	1,660
Depreciation and amortization	363	368	727	725
G&A expenses	660	584	1,324	1,200
Operating profit (loss)	1,006	(404)	3,679	(265)
Intersegment Eliminations [Member]
Transportation and terminals revenues	(700)	(517)	(1,607)	(1,015)
Product sales revenues	(88)	(28)	(198)	(28)
Total revenues	(788)	(545)	(1,805)	(1,043)
Operating expenses	(767)	(660)	(1,443)	(1,725)
Product purchases	(788)	(545)	(1,805)	(1,043)
Operating margin	767	660	1,443	1,725
Depreciation and amortization	$ 767	$ 660	$ 1,443	$ 1,725