Variable Interest Entities (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Variable Interest Entities
Balance				$ 3,111,398				$ 1,395,242	$ 3,111,398	$ 1,395,242	$ 1,350,294
Distributions paid									(462,699)	(340,038)	(281,203)
Contributions from non-controlling interest									685,219	264,782	126,392
Deferred income tax impact from changes in equity									(56,342)	(67,089)	(63,417)
Net income	(3,895)	(20,027)	85,498	(21,131)	29,923	(15,265)	186,533	15,774	40,445	216,965	104,800
Balance	4,798,133				3,111,398				4,798,133	3,111,398	1,395,242
Common Units
Variable Interest Entities
Balance				2,097,404				642,522	2,097,404	642,522	957,452
Distributions paid									(462,488)	(339,967)	(218,398)
Deferred income tax impact from changes in equity									(56,342)	(67,089)	(63,417)
Net income									38,077	220,402	60,695
Balance	3,476,295				2,097,404				3,476,295	2,097,404	642,522
Non-controlling Interest
Variable Interest Entities
Balance				261,463				189	261,463	189	392,842
Distributions paid									(211)	(71)	(62,805)
Contributions from non-controlling interest									685,219	264,782	126,392
Net income									2,368	(3,437)	44,105
Balance	719,813				261,463				719,813	261,463	189
As previously reported
Variable Interest Entities
Balance								1,502,067		1,502,067	1,458,566
Distributions paid										(345,854)	(285,285)
Contributions from non-controlling interest										265,620
Deferred income tax impact from changes in equity										(66,566)	(62,227)
Net income										218,788	106,245
Balance					3,215,591					3,215,591	1,502,067
As previously reported | Common Units
Variable Interest Entities
Balance								679,309		679,309	993,049
Distributions paid										(339,967)	(218,398)
Deferred income tax impact from changes in equity										(66,566)	(62,227)
Net income										220,402	60,695
Balance					2,134,714					2,134,714	679,309
As previously reported | Non-controlling Interest
Variable Interest Entities
Balance								70,227		70,227	465,517
Distributions paid										(5,887)	(66,887)
Contributions from non-controlling interest										265,620
Net income										(1,614)	45,550
Balance					$ 328,346					$ 328,346	$ 70,227