Significant Accounting Policies (Details 7) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Significant Accounting Policies
Interest expense	$ (284,491)	$ (288,896)	$ (849,482)	$ (835,532)
Net income attributable to noncontrolling interests	54,784	50,616	165,035	230,857
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	311,675	254,921	934,749	1,115,776
Amount reclassified from accumulated other comprehensive income (loss)
Significant Accounting Policies
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS			(5,687)
Accumulated derivative losses, net | Amount reclassified from accumulated other comprehensive income (loss)
Significant Accounting Policies
Interest expense			(6,642)
Net income attributable to noncontrolling interests			$ 955