Condensed Consolidated Statements Of Changes In Partners' Capital (USD $) In Thousands	Total	Limited Partners Common	Limited Partners Subordinated	Limited Partners Class B	Limited Partners Class C	General Partner	Noncontrolling Interest
Beginning Balance at Dec. 31, 2012	$ 3,796,506	$ 2,188,241	$ 834,001	$ 273,858	$ 295,551	$ 93,182	$ 111,673
Net income	131,123	62,435	41,558	7,233	6,738	10,787	2,372
Distribution to unitholders	(177,430)	(94,179)	(63,377)		(10,275)	(9,599)
Contributions from noncontrolling interest owners	72,131						72,131
Non-cash equity based compensation	3,994	3,994
Issuance of common units	399,922	399,922
Issuance of general partner interests	8,678					8,678
Beneficial conversion feature of Class B units		720		(720)
Amortization of beneficial conversion feature of Class B and Class C units		(29,777)		13,693	16,084
Ending Balance at Jun. 30, 2013	$ 4,234,924	$ 2,531,356	$ 812,182	$ 294,064	$ 308,098	$ 103,048	$ 186,176