Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Operating activities
Net income (loss)	$ 209,422,000		$ 65,200,000
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation and amortization	188,829,000		233,318,000
Other amortization expenses	1,320,000		1,672,000
Provision for loan losses	0
Asset Impairment Charges	2,220,000
Stock-based compensation expense	9,054,000		7,667,000
Loss (gain) on derivatives, net	(58,427,000)		0
Loss (gain) on extinguishment of debt, net	15,401,000		(148,000)
Income from unconsolidated entities	12,648,000		5,556,000
Rental income in excess of cash received	(27,244,000)		(15,323,000)
Amortization related to above (below) market leases, net	113,000		266,000
Net loss (gain) on sales of properties	(56,845,000)		0
Distributions by unconsolidated entities	172,000		4,560,000
Increase (decrease) in accrued expenses and other liabilities	(47,489,000)		(25,532,000)
Decrease (increase) in receivables and other assets	(22,992,000)		(18,575,000)
Net cash provided from (used in) operating activities	226,182,000		258,661,000
Investing activities
Cash disbursed for acquisitions	(1,500,994,000)		(55,041,000)
Cash disbursed for capital improvements to existing properties	(29,828,000)		(27,406,000)
Cash disbursed for construction in progress	(59,552,000)		(52,717,000)
Capitalized interest	(2,387,000)		(1,605,000)
Investment in real estate loans receivable	(384,695,000)		(29,709,000)
Other investments, net of payments	(102,126,000)		1,787,000
Principal collected on real estate loans receivable	16,501,000		10,646,000
Contributions to unconsolidated entities	(83,964,000)		(214,832,000)
Distributions by unconsolidated entities	89,195,000		12,462,000
Proceeds from (payments on) derivatives investing	72,477,000		0
Decrease (increase) in restricted cash	(1,660,000)		5,024,000
Proceeds from sales of real property	177,265,000		0
Net cash provided from (used in) investing activities	(1,809,768,000)		(351,391,000)
Financing activities
Net increase (decrease) under unsecured lines of credit arrangements	410,000,000		432,000,000
Proceeds from issuance of senior unsecured notes	0		0
Payments to extinguish senior unsecured notes	(154,654,000)		(1,000)
Secured debt issued	82,724,000		10,690,000
Payments on secured debt	(208,057,000)		(129,539,000)
Net proceeds from the issuance of common stock	1,489,547,000		63,755,000
Decrease (increase) in deferred loan expenses	(4,485,000)		(2,284,000)
Contributions by noncontrolling interests	2,514,000	[1]	778,000	[1]
Distributions to noncontrolling interests	(7,417,000)	[1]	(7,386,000)	[1]
Acquisitions of noncontrolling interests	0		(1,175,000)
Cash distributions to stockholders	(288,921,000)		(247,154,000)
Other financing activities	(8,428,000)		(87,000)
Net cash provided from (used in) financing activities	1,312,823,000		119,597,000
Effect of foreign currency translation on cash and cash equivalents	(690,000)		281,000
Increase (decrease) in cash and cash equivalents	(271,453,000)		27,148,000
Cash and cash equivalents at beginning of period	473,726,000		158,780,000
Cash and cash equivalents at end of period	202,273,000		185,928,000
Supplemental cash flow information:
Interest paid	134,737,000		126,302,000
Income taxes paid	$ 2,942,000		$ 10,064,000

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