Variable Interest Entity (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended						3 Months Ended	9 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Common Units	Sep. 30, 2012 Common Units	Sep. 30, 2013 Non-controlling Interest	Sep. 30, 2012 Non-controlling Interest	Sep. 30, 2012 As previously reported	Sep. 30, 2012 As previously reported	Dec. 31, 2012 As previously reported	Sep. 30, 2012 As previously reported Common Units	Sep. 30, 2012 As previously reported Non-controlling Interest
Variable Interest Entities and Equity Method Investment
Balance			$ 3,111,398	$ 1,395,242	$ 2,097,404	$ 642,522	$ 261,463	$ 189		$ 1,502,067	$ 3,215,591	$ 679,309	$ 70,227
Distributions paid			(334,126)	(244,240)	(333,946)	(244,169)	(180)	(71)		(248,664)		(244,169)	(4,495)
Contributions from non-controlling interest			685,219	56,101			685,219	56,101		56,940			56,940
Deferred income tax impact from changes in equity			(37,346)	(75,248)	(37,346)	(75,248)				(74,855)		(74,855)
Net income (loss)	(20,027)	(15,265)	44,340	187,042	44,637	188,588	(297)	(1,546)	(14,756)	188,653		188,588	65
Balance	$ 4,150,443	$ 2,515,696	$ 4,150,443	$ 2,515,696	$ 2,968,451	$ 1,708,492	$ 579,967	$ 54,673	$ 2,620,940	$ 2,620,940	$ 3,215,591	$ 1,745,672	$ 122,737