Segment Disclosures (Schedule Of Business Segment Reporting Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 628,935	$ 678,779
Operating expenses	146,025	143,296
Cost of product sales	169,094	199,592
Other income	6,941	0
Earnings of non-controlled entities	(31,255)	(34,538)
Operating margin	352,012	370,429
Depreciation, amortization and impairment	61,871	51,879
G&A expense	45,995	46,556
Operating profit	244,146	271,994
Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	422,573	493,465
Operating expenses	89,678	94,049
Cost of product sales	160,154	190,333
Other income	614
Earnings of non-controlled entities	1,430	(2,318)
Operating margin	171,925	211,401
Depreciation, amortization and impairment	35,534	28,907
G&A expense	27,715	28,887
Operating profit	108,676	153,607
Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	156,807	136,713
Operating expenses	43,823	33,591
Cost of product sales	6,664	7,050
Other income	1,573
Earnings of non-controlled entities	(32,302)	(31,608)
Operating margin	140,195	127,680
Depreciation, amortization and impairment	15,259	12,762
G&A expense	12,615	11,906
Operating profit	112,321	103,012
Operating Segments [Member] | Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Revenues	50,493	49,516
Operating expenses	14,897	17,964
Cost of product sales	2,276	2,209
Other income	4,754
Earnings of non-controlled entities	(383)	(612)
Operating margin	38,457	29,955
Depreciation, amortization and impairment	9,643	8,817
G&A expense	5,665	5,763
Operating profit	23,149	15,375
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(938)	(915)
Operating expenses	(2,373)	(2,308)
Cost of product sales	0	0
Other income	0
Earnings of non-controlled entities	0	0
Operating margin	1,435	1,393
Depreciation, amortization and impairment	1,435	1,393
G&A expense	0	0
Operating profit	0	0
Service [Member]
Segment Reporting Information [Line Items]
Revenues	460,792	431,937
Service [Member] | Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	267,005	260,394
Service [Member] | Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	147,608	126,258
Service [Member] | Operating Segments [Member] | Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Revenues	47,117	46,200
Service [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(938)	(915)
Product [Member]
Segment Reporting Information [Line Items]
Revenues	162,995	241,592
Product [Member] | Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	155,156	232,774
Product [Member] | Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	5,713	6,439
Product [Member] | Operating Segments [Member] | Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Revenues	2,126	2,379
Product [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	0	0
Product and Service, Other [Member]
Segment Reporting Information [Line Items]
Revenues	5,148	5,250
Product and Service, Other [Member] | Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	412	297
Product and Service, Other [Member] | Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	3,486	4,016
Product and Service, Other [Member] | Operating Segments [Member] | Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,250	937
Product and Service, Other [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0