Significant Accounting Policies (Details 7) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Significant Accounting Policies
Interest expense	$ (279,966)	$ (288,560)	$ (564,991)	$ (546,636)
Net income attributable to noncontrolling interests	59,755	44,657	110,250	180,241
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	339,936	215,445	623,074	860,855
Amount reclassified from accumulated other comprehensive income (loss)
Significant Accounting Policies
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS			(3,490)
Accumulated derivative losses, net | Amount reclassified from accumulated other comprehensive income (loss)
Significant Accounting Policies
Interest expense			(4,076)
Net income attributable to noncontrolling interests			$ 586