Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Operating activities
Net income	$ 305,825,000		$ 112,588,000
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation and amortization	648,737,000		630,579,000
Other amortization expenses	5,626,000		6,662,000
Stock-based compensation expense	26,108,000		16,650,000
Loss (gain) on derivatives, net	400,000		4,465,000
Loss (gain) on extinguishment of debt, net	3,075,000		(4,376,000)
Income (loss) from unconsolidated entities	19,705,000		3,529,000
Rental income in excess of cash received	(51,017,000)		(31,226,000)
Amortization related to above (below) market leases, net	503,000		313,000
Net loss (gain) on sales of properties	(42,683,000)		(57,202,000)
Distributions by unconsolidated entities	8,883,000		0
Increase (decrease) in accrued expenses and other liabilities	(19,259,000)		9,646,000
Decrease (increase) in receivables and other assets	(51,734,000)		(65,721,000)
Net cash provided from (used in) operating activities	854,169,000		625,907,000
Investing activities
Cash disbursed for acquisitions	(991,315,000)		(3,093,347,000)
Cash disbursed for capital improvements to existing properties	(86,324,000)		(82,519,000)
Cash disbursed for construction in progress	(140,829,000)		(178,850,000)
Capitalized interest	(5,084,000)		(4,698,000)
Investment in real estate loans receivable	(79,264,000)		(77,336,000)
Other investments, net of payments	(39,202,000)		(16,589,000)
Principal collected on real estate loans receivable	46,268,000		85,555,000
Contributions to unconsolidated entities	(246,794,000)		(381,667,000)
Distributions by unconsolidated entities	38,261,000		31,699,000
Proceeds from (payments on) derivatives investing	0		60,909,000
Decrease (increase) in restricted cash	(45,346,000)		68,796,000
Proceeds from sales of real property	442,733,000		385,493,000
Net cash provided from (used in) investing activities	(1,106,896,000)		(3,202,554,000)
Financing activities
Net increase (decrease) under unsecured lines of credit arrangements	(130,000,000)		834,050,000
Proceeds from issuance of senior unsecured notes	0		497,862,000
Payments to extinguish senior unsecured notes	(47,591,000)		(217,615,000)
Secured debt issued	98,100,000		85,140,000
Payments on secured debt	(286,162,000)		(575,373,000)
Net proceeds from the issuance of common stock	2,260,908,000		1,792,552,000
Decrease (increase) in deferred loan expenses	(17,429,000)		(12,398,000)
Contributions by noncontrolling interests	5,572,000	[1]	5,350,000	[1]
Distributions to noncontrolling interests	(30,909,000)	[1]	(22,502,000)	[1]
Acquisitions of noncontrolling interests	(1,175,000)		(23,247,000)
Cash distributions to stockholders	(757,980,000)		(668,797,000)
Other financing activities	(844,000)		(1,710,000)
Net cash provided from (used in) financing activities	1,092,490,000		1,693,312,000
Effect of foreign currency translation on cash and cash equivalents	135,000		14,409,000
Increase (decrease) in cash and cash equivalents	839,898,000		(868,926,000)
Cash and cash equivalents at beginning of period	158,780,000		1,033,764,000
Cash and cash equivalents at end of period	998,678,000		164,838,000
Supplemental cash flow information:
Interest paid	365,738,000		342,739,000
Income taxes paid	$ 16,672,000		$ 5,146,000

[1] (1) Includes amounts attributable to redeemable noncontrolling interests.