Segment Disclosures (Schedule Of Business Segment Reporting Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 638,020	$ 572,848	$ 1,960,890	$ 1,834,362
Operating expenses	172,115	165,368	475,256	442,254
Cost of product sales	120,510	121,819	473,781	440,670
(Earnings) losses of non-controlled entities	(53,795)	(31,151)	(130,843)	(78,173)
Operating margin	399,190	316,812	1,142,696	1,029,611
Depreciation and amortization	56,228	49,909	161,726	146,103
G&A expense	47,389	37,202	147,235	120,876
Operating profit	295,573	229,701	833,735	762,632
Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	430,311	396,558	1,366,126	1,318,921
Operating expenses	112,279	118,665	319,670	312,911
Cost of product sales	106,756	103,391	434,632	396,292
(Earnings) losses of non-controlled entities	(3,393)	700	(5,614)	167
Operating margin	214,669	173,802	617,438	609,551
Depreciation and amortization	30,440	27,469	89,855	81,440
G&A expense	28,751	23,808	90,825	75,429
Operating profit	155,478	122,525	436,758	452,682
Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	161,247	132,378	453,044	375,000
Operating expenses	45,195	31,163	109,963	89,991
Cost of product sales	11,590	16,630	32,401	37,814
(Earnings) losses of non-controlled entities	(49,420)	(31,244)	(122,879)	(76,388)
Operating margin	153,882	115,829	433,559	323,583
Depreciation and amortization	15,145	12,584	40,648	35,947
G&A expense	12,766	9,266	38,127	30,376
Operating profit	125,971	93,979	354,784	257,260
Operating Segments [Member] | Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Revenues	47,385	44,813	144,473	142,929
Operating expenses	17,178	17,723	52,835	45,753
Cost of product sales	2,164	1,798	6,748	6,564
(Earnings) losses of non-controlled entities	(982)	(607)	(2,350)	(1,952)
Operating margin	29,025	25,899	87,240	92,564
Depreciation and amortization	9,029	8,574	26,764	24,803
G&A expense	5,872	4,128	18,283	15,071
Operating profit	14,124	13,197	42,193	52,690
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(923)	(901)	(2,753)	(2,488)
Operating expenses	(2,537)	(2,183)	(7,212)	(6,401)
Cost of product sales	0	0	0	0
(Earnings) losses of non-controlled entities	0	0	0	0
Operating margin	1,614	1,282	4,459	3,913
Depreciation and amortization	1,614	1,282	4,459	3,913
G&A expense	0	0	0	0
Operating profit	0	0	0	0
Service [Member]
Segment Reporting Information [Line Items]
Revenues	488,775	446,935	1,392,960	1,272,845
Service [Member] | Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	300,034	289,030	851,492	808,818
Service [Member] | Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	145,118	116,305	409,329	329,813
Service [Member] | Operating Segments [Member] | Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Revenues	44,546	42,501	134,892	136,702
Service [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(923)	(901)	(2,753)	(2,488)
Product [Member]
Segment Reporting Information [Line Items]
Revenues	144,403	121,010	552,792	548,634
Product [Member] | Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	129,926	107,175	513,634	509,068
Product [Member] | Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	12,666	12,370	32,387	34,876
Product [Member] | Operating Segments [Member] | Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,811	1,465	6,771	4,690
Product [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Product and Service, Other [Member]
Segment Reporting Information [Line Items]
Revenues	4,842	4,903	15,138	12,883
Product and Service, Other [Member] | Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	351	353	1,000	1,035
Product and Service, Other [Member] | Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	3,463	3,703	11,328	10,311
Product and Service, Other [Member] | Operating Segments [Member] | Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,028	847	2,810	1,537
Product and Service, Other [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0