Segment Disclosures (Segment Reporting Information By Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Transportation and terminals revenue	$ 1,731,775	$ 1,591,119	$ 1,544,746
Product sales revenue	758,206	599,602	629,836
Affiliate management fee revenue	17,680	14,689	13,871
Total revenue	2,507,661	2,205,410	2,188,453
Operating expenses	577,978	528,672	523,650
Cost of product sales	635,617	493,338	447,273
Earnings of non-controlled entities	(120,994)	(78,696)	(66,483)
Operating margin	1,415,060	1,262,096	1,284,013
Depreciation and amortization expense	196,630	178,142	166,812
G&A expenses	165,717	147,165	149,948
Operating profit	1,052,713	936,789	967,253
Total assets	7,394,375	6,772,073	6,041,567
Goodwill	53,260	53,260	53,260
Investments in non-controlled entities	1,082,511	931,255	765,628
Operating Segments [Member]
Segment Reporting Information [Line Items]
Additions to long-lived assets	564,687	646,363	671,048
Total assets	7,188,235	6,712,139	5,982,346
Operating Segments [Member] | Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenue	1,096,040	1,002,368	974,505
Product sales revenue	717,140	561,759	623,102
Affiliate management fee revenue	1,388	765	0
Total revenue	1,814,568	1,564,892	1,597,607
Operating expenses	400,439	380,347	376,279
Cost of product sales	586,751	459,989	442,621
Earnings of non-controlled entities	1,632	968	193
Operating margin	825,746	723,588	778,514
Depreciation and amortization expense	109,434	103,388	96,244
G&A expenses	103,225	91,372	93,567
Operating profit	613,087	528,828	588,703
Additions to long-lived assets	269,369	291,202	310,907
Total assets	3,499,492	3,289,600	2,991,322
Goodwill	38,369	38,369	38,369
Investments in non-controlled entities	29,578	31,029	12,381
Operating Segments [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenue	458,455	407,837	394,098
Product sales revenue	35,053	31,170	3,587
Affiliate management fee revenue	13,950	12,533	12,495
Total revenue	507,458	451,540	410,180
Operating expenses	120,920	88,528	89,001
Cost of product sales	41,325	31,657	3,278
Earnings of non-controlled entities	(120,173)	(76,972)	(63,918)
Operating margin	465,386	408,327	381,819
Depreciation and amortization expense	48,796	38,081	35,681
G&A expenses	41,490	36,165	35,721
Operating profit	375,100	334,081	310,417
Additions to long-lived assets	168,306	250,433	289,851
Total assets	2,817,186	2,631,407	2,313,110
Goodwill	12,082	12,082	12,082
Investments in non-controlled entities	961,032	886,920	739,470
Operating Segments [Member] | Marine Storage Segment [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenue	180,683	181,721	176,143
Product sales revenue	6,013	6,673	3,147
Affiliate management fee revenue	2,342	1,391	1,376
Total revenue	189,038	189,785	180,666
Operating expenses	65,296	65,559	62,221
Cost of product sales	7,541	1,692	1,374
Earnings of non-controlled entities	(2,453)	(2,692)	(2,758)
Operating margin	118,654	125,226	119,829
Depreciation and amortization expense	33,126	31,718	31,036
G&A expenses	21,002	19,628	20,660
Operating profit	64,526	73,880	68,133
Additions to long-lived assets	127,012	104,728	70,290
Total assets	871,557	791,132	677,914
Goodwill	2,809	2,809	2,809
Investments in non-controlled entities	91,901	13,306	13,777
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total assets	206,140	59,934	59,221
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Transportation and terminals revenue	(3,403)	(807)	0
Product sales revenue	0	0	0
Affiliate management fee revenue	0	0	0
Total revenue	(3,403)	(807)	0
Operating expenses	(8,677)	(5,762)	(3,851)
Cost of product sales	0	0	0
Earnings of non-controlled entities	0	0	0
Operating margin	5,274	4,955	3,851
Depreciation and amortization expense	5,274	4,955	3,851
G&A expenses	0	0	0
Operating profit	$ 0	$ 0	$ 0