Condensed Consolidated Statement Of Changes In Partners' Capital (USD $) In Thousands	Total	Noncontrolling Interest	Limited Partners Class B	Limited Partners Class C	Limited Partner	General Partner
Beginning Balance at Dec. 31, 2013	$ 4,352,790	$ 253,884	$ 318,472	$ 322,896	$ 3,343,145	$ 114,393
Net income	65,529	4,451	2,554	1,175	37,733	19,616
Distribution to unitholders	(122,134)			(6,215)	(98,755)	(17,164)
Conversion of Class C units to common units				(321,151)	321,151
Contributions from noncontrolling interest owners	53,297	53,297
Non-cash equity based compensation	(1,234)				(1,234)
Issuance of general partner interests	460					460
Issuance of common units	7,548				7,548
Beneficial conversion feature of Class B units			(552)		552
Amortization of beneficial conversion feature of Class B and Class C units			7,096	3,295	(10,391)
Ending Balance at Mar. 31, 2014	$ 4,356,256	$ 311,632	$ 327,570		$ 3,599,749	$ 117,305