Segment Disclosures (Schedule Of Business Segment Reporting Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 598,264	$ 656,596	$ 1,841,478	$ 1,987,230
Operating expenses	161,982	169,387	457,597	484,341
Cost of product sales	96,119	108,757	395,864	430,727
Other operating (income) expense	2,863	379	(539)	(1,538)
Earnings of non-controlled entities	(39,135)	(50,189)	(116,484)	(122,229)
Operating margin	376,435	428,262	1,105,040	1,195,929
Depreciation, amortization and impairment	71,822	56,627	193,896	181,028
G&A expense	38,016	51,156	117,092	149,534
Operating profit	266,597	320,479	794,052	865,367
Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	436,640	490,839	1,381,264	1,493,338
Operating expenses	118,579	127,328	327,866	362,870
Cost of product sales	86,356	100,416	365,314	411,012
Other operating (income) expense	(193)	(3,249)	(2,223)	(9,648)
Earnings of non-controlled entities	(7,134)	(4,142)	(25,946)	(145)
Operating margin	239,032	270,486	716,253	729,249
Depreciation, amortization and impairment	41,620	39,660	128,708	128,724
G&A expense	27,487	36,806	84,802	107,179
Operating profit	169,925	194,020	502,743	493,346
Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	163,554	167,313	465,307	497,727
Operating expenses	46,956	44,961	139,645	129,431
Cost of product sales	9,763	8,341	30,550	19,715
Other operating (income) expense	3,056	3,628	1,684	8,110
Earnings of non-controlled entities	(32,001)	(46,047)	(90,538)	(122,084)
Operating margin	135,780	156,430	383,966	462,555
Depreciation, amortization and impairment	28,579	15,621	60,367	48,179
G&A expense	10,529	14,350	32,290	42,355
Operating profit	96,672	126,459	291,309	372,021
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(1,930)	(1,556)	(5,093)	(3,835)
Operating expenses	(3,553)	(2,902)	(9,914)	(7,960)
Cost of product sales	0	0	0	0
Other operating (income) expense	0	0	0	0
Earnings of non-controlled entities	0	0	0	0
Operating margin	1,623	1,346	4,821	4,125
Depreciation, amortization and impairment	1,623	1,346	4,821	4,125
G&A expense	0	0	0	0
Operating profit	0	0	0	0
Service [Member]
Segment Reporting Information [Line Items]
Revenues	473,531	506,432	1,343,741	1,473,629
Service [Member] | Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	320,809	352,611	914,887	1,009,812
Service [Member] | Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	154,652	155,377	433,947	467,652
Service [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(1,930)	(1,556)	(5,093)	(3,835)
Product [Member]
Segment Reporting Information [Line Items]
Revenues	119,445	144,807	481,842	497,791
Product [Member] | Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	114,252	136,464	461,701	478,441
Product [Member] | Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	5,193	8,343	20,141	19,350
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	5,288	5,357	15,895	15,810
Product and Service, Other [Member] | Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,579	1,764	4,676	5,085
Product and Service, Other [Member] | Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	3,709	3,593	11,219	10,725
Product and Service, Other [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0