CONDENSED CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL (Unaudited) - USD ($) $ in Thousands	Total	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	Limited Partners
Beginning balance at Dec. 31, 2014	$ 3,940,596	$ (115,288)	$ 237,968	$ 3,817,916
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	202,490		(701)	203,191
Acquisition of additional interest in Buckeye Memphis	(10,044)		(1,768)	(8,276)
Adjusted value of noncontrolling interest in acquisition	(1,220)		(1,220)
Distributions paid to unitholders	(290,632)		1,835	(292,467)
Net proceeds from issuance of LP Units	62,414			62,414
Amortization of unit-based compensation awards	11,134			11,134
Net proceeds from exercise of LP Unit options	173			173
Payment of tax withholding on issuance of LTIP awards	(6,539)			(6,539)
Distributions paid to noncontrolling interests	(3,218)		(3,218)
Contributions from noncontrolling interests	30,000		30,000
Other comprehensive income	2,739	2,739
Noncash accrual for distribution equivalent rights	(1,361)			(1,361)
Other	18		(348)	366
Ending balance at Jun. 30, 2015	3,936,550	(112,549)	262,548	3,786,551
Beginning balance at Dec. 31, 2015	4,016,741	(97,841)	281,352	3,833,230
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	279,476		7,907	271,569
Distributions paid to unitholders	(310,634)		1,541	(312,175)
Net proceeds from issuance of LP Units	90,182			90,182
Amortization of unit-based compensation awards	14,090			14,090
Net proceeds from exercise of LP Unit options	300			300
Payment of tax withholding on issuance of LTIP awards	(5,082)			(5,082)
Distributions paid to noncontrolling interests	(6,194)		(6,194)
Contributions from noncontrolling interests	2,200		2,200
Other comprehensive income	5,313	5,313
Noncash accrual for distribution equivalent rights	(1,468)			(1,468)
Other	0		48	(48)
Ending balance at Jun. 30, 2016	$ 4,084,924	$ (92,528)	$ 286,854	$ 3,890,598