Consolidated Statements Of Changes In Partners' Capital (USD $) In Thousands	Total	Limited Partners Subordinated	Noncontrolling Interest	Limited Partners Class B	Limited Partners Class C	Limited Partner	General Partner	Common Units	Common Units Limited Partner	Class B Units	Class B Units Limited Partners Class B	Class C Units	Class C Units Limited Partners Class C
Beginning Balance at Dec. 31, 2011	$ 2,473,145	$ 869,241				$ 1,561,504	$ 42,400
Net income	178,387	78,736	(68)	214	202	90,822	8,481
Distribution to unitholders	(251,720)	(113,976)				(130,204)	(7,540)
Contributions from noncontrolling interest owners	111,741		111,741
Non-cash equity based compensation	3,695					3,695
Issuance of common units								569,255	569,255	331,148	331,148	331,115	331,115
Issuance of general partner interests	49,841						49,841
Beneficial conversion feature of Class B and Class C units				(58,328)	(36,745)	95,073				58,300
Amortization of beneficial conversion feature of Class B and Class C units				824	979	(1,803)
Other adjustments	(101)					(101)
Ending Balance at Dec. 31, 2012	3,796,506	834,001	111,673	273,858	295,551	2,188,241	93,182
Net income	341,149	54,479	5,124	18,055	16,574	206,236	40,681
Distribution to unitholders	(389,128)	(96,879)			(21,699)	(241,080)	(29,470)
Conversion of subordinated units to common units		(791,601)				791,601
Contributions from noncontrolling interest owners	137,087		137,087
Non-cash equity based compensation	7,864					7,864
Issuance of common units	449,312					449,312
Issuance of general partner interests	10,000						10,000
Beneficial conversion feature of Class B and Class C units				(1,317)		1,317
Amortization of beneficial conversion feature of Class B and Class C units				27,876	32,470	(60,346)
Ending Balance at Dec. 31, 2013	4,352,790		253,884	318,472	322,896	3,343,145	114,393
Net income	429,371		31,311	13,550	1,175	235,828	147,507
Distribution to unitholders	(536,716)				(6,215)	(438,635)	(91,866)
Conversion of subordinated units to common units					(321,151)	321,151
Contributions from noncontrolling interest owners	192,495		192,495
Non-cash equity based compensation	19,432					19,432
Issuance of common units	52,155					52,155
Issuance of general partner interests	2,790						2,790
Beneficial conversion feature of Class B and Class C units				1,317		(1,317)
Amortization of beneficial conversion feature of Class B and Class C units				26,851	3,295	(30,146)
Ending Balance at Dec. 31, 2014	$ 4,512,317		$ 477,690	$ 360,190		$ 3,501,613	$ 172,824