Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Operating activities
Net income	$ 65,200,000		$ 71,799,000
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation and amortization	233,318,000		187,122,000
Other amortization expenses	1,672,000		4,194,000
Stock-based compensation expense	7,667,000		10,508,000
Loss (gain) on derivatives, net	0		2,309,000
Loss (gain) on extinguishment of debt, net	148,000		308,000
Income (loss) from unconsolidated entities	5,556,000		(2,262,000)
Rental income in excess of cash received	(15,323,000)		(2,538,000)
Amortization related to above (below) market leases, net	266,000		172,000
Loss (gain) on sales of properties, net	0		(82,492,000)
Distributions by unconsolidated entities	4,560,000		0
Increase (decrease) in accrued expenses and other liabilities	(25,532,000)		18,276,000
Decrease (increase) in receivables and other assets	(18,575,000)		(6,972,000)
Net cash provided from (used in) operating activities	258,661,000		199,808,000
Investing activities
Cash disbursed for acquisitions	(55,041,000)		(1,786,396,000)
Cash disbursed for capital improvements to existing properties	(27,406,000)		(24,129,000)
Cash disbursed for construction in progress	(52,717,000)		(40,053,000)
Capitalized interest	(1,605,000)		(1,606,000)
Investment in real estate loans receivable	(29,709,000)		(11,971,000)
Other investments, net of payments	1,787,000		(1,978,000)
Principal collected on real estate loans receivable	10,646,000		49,926,000
Contributions to unconsolidated entities	(214,832,000)		(359,575,000)
Distributions by unconsolidated entities	12,462,000		9,916,000
Proceeds from (payments on) derivatives investing	0		(2,604,000)
Decrease (increase) in restricted cash	5,024,000		(94,840,000)
Proceeds from sales of real property	0		294,607,000
Net cash provided from (used in) investing activities	(351,391,000)		(1,968,703,000)
Financing activities
Net increase (decrease) under unsecured lines of credit arrangements	432,000,000		710,000,000
Proceeds from issuance of senior unsecured notes	0		497,862,000
Payments to extinguish senior unsecured notes	(1,000)		0
Secured debt issued	10,690,000		0
Payments on secured debt	(129,539,000)		(18,931,000)
Net proceeds from the issuance of common stock	63,755,000		45,377,000
Decrease (increase) in deferred loan expenses	(2,284,000)		(9,650,000)
Contributions by noncontrolling interests	778,000	[1]	1,420,000	[1]
Distributions to noncontrolling interests	(7,386,000)	[1]	(4,522,000)	[1]
Acquisitions of noncontrolling interests	(1,175,000)		0
Cash distributions to stockholders	(247,154,000)		(216,148,000)
Other financing activities	(87,000)		(992,000)
Net cash provided from (used in) financing activities	119,597,000		1,004,416,000
Effect of foreign currency translation on cash and cash equivalents	281,000		557,000
Increase (decrease) in cash and cash equivalents	27,148,000		(763,922,000)
Cash and cash equivalents at beginning of period	158,780,000		1,033,764,000
Cash and cash equivalents at end of period	185,928,000		269,842,000
Supplemental cash flow information:
Interest paid	126,302,000		99,202,000
Income taxes paid	$ 10,064,000		$ 920,000

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