Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
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
Costs and expenses:
Operating	577,978	528,672	523,650
Cost of product sales	635,617	493,338	447,273
Depreciation and amortization	196,630	178,142	166,812
General and administrative	165,717	147,165	149,948
Total costs and expenses	1,575,942	1,347,317	1,287,683
Earnings of non-controlled entities	120,994	78,696	66,483
Operating profit	1,052,713	936,789	967,253
Interest expense	210,698	194,187	158,895
Interest capitalized	(15,565)	(27,375)	(14,442)
Interest income	(1,415)	(1,402)	(1,276)
Gain on sale of asset	(18,505)	0	0
Gain on exchange of interest in non-controlled entity	0	(28,144)	0
Other (income) expense	4,139	(6,466)	2,618
Income before provision for income taxes	873,361	805,989	821,458
Provision for income taxes	3,830	3,218	2,336
Net income	$ 869,531	$ 802,771	$ 819,122
Basic net income per limited partner unit (in dollars per unit)	$ 3.81	$ 3.52	$ 3.60
Diluted net income per limited partner unit (in dollars per unit)	$ 3.81	$ 3.52	$ 3.59
Weighted average number of limited partner units outstanding used for basic net income per unit calculation (in units)	228,176	227,926	227,550
Weighted average number of limited partner units outstanding used for diluted net income per unit calculation (in units)	228,338	228,057	227,888