Segment Disclosures (Schedule Of Business Segment Reporting Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Transportation and terminals revenue	$ 431,937	$ 392,671
Product sales revenue	241,592	245,620
Affiliate management fee revenue	5,250	3,783
Total revenue	678,779	642,074
Operating expenses	143,296	131,592
Cost of product sales	199,592	172,876
Earnings of non-controlled entities	(34,538)	(21,446)
Operating margin	370,429	359,052
Depreciation and amortization	51,879	47,298
G&A expense	46,556	40,281
Operating profit	271,994	271,473
Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenue	260,394	241,905
Product sales revenue	232,774	240,170
Affiliate management fee revenue	297	329
Total revenue	493,465	482,404
Operating expenses	94,049	93,533
Cost of product sales	190,333	167,681
Earnings of non-controlled entities	(2,318)	(111)
Operating margin	211,401	221,301
Depreciation and amortization	28,907	26,966
G&A expense	28,887	24,901
Operating profit	153,607	169,434
Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenue	126,258	105,053
Product sales revenue	6,439	3,103
Affiliate management fee revenue	4,016	3,134
Total revenue	136,713	111,290
Operating expenses	33,591	27,418
Cost of product sales	7,050	2,577
Earnings of non-controlled entities	(31,608)	(20,650)
Operating margin	127,680	101,945
Depreciation and amortization	12,762	10,856
G&A expense	11,906	10,039
Operating profit	103,012	81,050
Operating Segments [Member] | Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenue	46,200	46,407
Product sales revenue	2,379	2,347
Affiliate management fee revenue	937	320
Total revenue	49,516	49,074
Operating expenses	17,964	12,655
Cost of product sales	2,209	2,618
Earnings of non-controlled entities	(612)	(685)
Operating margin	29,955	34,486
Depreciation and amortization	8,817	8,156
G&A expense	5,763	5,341
Operating profit	15,375	20,989
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenue	(915)	(694)
Product sales revenue	0	0
Affiliate management fee revenue	0	0
Total revenue	(915)	(694)
Operating expenses	(2,308)	(2,014)
Cost of product sales	0	0
Earnings of non-controlled entities	0	0
Operating margin	1,393	1,320
Depreciation and amortization	1,393	1,320
G&A expense	0	0
Operating profit	$ 0	$ 0