Significant Accounting Policies (Details 7) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Significant Accounting Policies
Interest expense	$ (232,173)	$ (254,234)
Net income attributable to noncontrolling interests	92,467	58,621
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	539,134	341,648
Amount reclassified from accumulated other comprehensive income (loss)
Significant Accounting Policies
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	(2,246)	(2,305)
Accumulated derivative losses, net | Amount reclassified from accumulated other comprehensive income (loss)
Significant Accounting Policies
Interest expense	(2,627)	(2,697)
Net income attributable to noncontrolling interests	$ 381	$ 392