Segment Disclosures (Schedule Of Business Segment Reporting Information) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Transportation and terminals revenue		$ 392,240	$ 384,901	$ 762,315	$ 738,713
Product sales revenue	[1]	123,689	109,969	270,251	283,096
Affiliate management fee revenue		2,968	3,558	6,147	6,921
Total revenue		518,897	498,428	1,038,713	1,028,730
Operating expenses		134,162	142,318	257,395	249,025
Cost of product sales	[1]	95,703	94,507	209,288	230,686
Earnings of non-controlled entities		(15,339)	(24,542)	(32,967)	(34,132)
Operating margin		304,371	286,145	604,997	583,151
Depreciation and amortization expense		43,302	40,440	87,056	82,137
G&A expenses		34,542	37,942	75,416	73,440
Operating profit		226,527	207,763	442,525	427,574
Operating Segments [Member] | Refined Products [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenue		247,842	238,317	472,592	459,000
Product sales revenue	[1]	122,311	109,323	266,227	281,962
Affiliate management fee revenue		124	0	204	0
Total revenue		370,277	347,640	739,023	740,962
Operating expenses		98,500	105,081	184,485	179,293
Cost of product sales	[1]	94,392	94,326	206,248	229,960
Earnings of non-controlled entities		38	43	80	98
Operating margin		177,347	148,190	348,210	331,611
Depreciation and amortization expense		24,971	23,962	50,091	47,409
G&A expenses		20,498	23,893	45,859	46,492
Operating profit		131,878	100,335	252,260	237,710
Operating Segments [Member] | Crude Oil Pipeline and Terminals [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenue		101,340	102,035	203,068	192,901
Product sales revenue	[1]	(28)	0	1,715	0
Affiliate management fee revenue		2,486	3,211	5,270	6,238
Total revenue		103,798	105,246	210,053	199,139
Operating expenses		20,550	22,293	41,742	40,460
Cost of product sales	[1]	1,016	0	2,361	0
Earnings of non-controlled entities		(14,711)	(23,905)	(31,690)	(32,829)
Operating margin		96,943	106,858	197,640	191,508
Depreciation and amortization expense		9,062	8,264	18,931	16,493
G&A expenses		9,146	9,031	18,926	17,117
Operating profit		78,735	89,563	159,783	157,898
Operating Segments [Member] | Marine Storage [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenue		43,058	44,549	86,655	86,812
Product sales revenue	[1]	1,406	646	2,309	1,134
Affiliate management fee revenue		358	347	673	683
Total revenue		44,822	45,542	89,637	88,629
Operating expenses		16,275	15,881	33,523	31,216
Cost of product sales	[1]	295	181	679	726
Earnings of non-controlled entities		(666)	(680)	(1,357)	(1,401)
Operating margin		28,918	30,160	56,792	58,088
Depreciation and amortization expense		8,106	7,277	15,679	16,291
G&A expenses		4,898	5,018	10,631	9,831
Operating profit		15,914	17,865	30,482	31,966
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenue		0	0	0	0
Product sales revenue	[1]	0	0	0	0
Affiliate management fee revenue		0	0	0	0
Total revenue		0	0	0	0
Operating expenses		(1,163)	(937)	(2,355)	(1,944)
Cost of product sales	[1]	0	0	0	0
Earnings of non-controlled entities		0	0	0	0
Operating margin		1,163	937	2,355	1,944
Depreciation and amortization expense		1,163	937	2,355	1,944
G&A expenses		0	0	0	0
Operating profit		$ 0	$ 0	$ 0	$ 0

[1] Includes gains (losses) on related NYMEX contracts. See Note 8–Derivative Financial Instruments.