Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Statements Of Income [Abstract]
Transportation and terminals revenues	$ 248,761	$ 223,192	$ 466,315	$ 428,600
Product sales revenues	200,568	159,943	476,298	397,239
Affiliate management fee revenue	198	192	397	385
Total revenues	449,527	383,327	943,010	826,224
Costs and expenses:
Operating	82,326	81,323	150,778	143,684
Product purchases	144,498	118,836	393,110	330,066
Depreciation and amortization	31,486	30,664	62,996	60,027
General and administrative	25,414	25,281	49,158	49,871
Total costs and expenses	283,724	256,104	656,042	583,648
Equity earnings	1,478	1,443	3,126	2,810
Operating profit	167,281	128,666	290,094	245,386
Interest expense	29,118	25,988	58,241	52,474
Interest income	(29)	(1)	(64)	(11)
Interest capitalized	(1,028)	(1,190)	(1,892)	(1,861)
Debt placement fee amortization expense	518	385	1,037	770
Income before provision for income taxes	138,702	103,484	232,772	194,014
Provision for income taxes	881	485	1,427	950
Net income	137,821	102,999	231,345	193,064
Allocation of net income (loss):
Non-controlling owners' interest				(63)
Limited partners' interest	$ 137,821	$ 102,999	$ 231,345	$ 193,127
Basic and diluted net income per limited partner unit	$ 1.22	$ 0.91	$ 2.04	$ 1.71
Weighted average number of limited partner units outstanding used for basic and diluted net income per unit calculation	113,214	112,847	113,153	112,804