Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Operating activities
Net income	$ 57,458		$ 31,810
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation and amortization	127,422		74,768
Other amortization expenses	4,984		4,338
Provision for loan losses	0		248
Impairment of assets	0		202
Stock-based compensation expense	11,323		5,593
Unrealized loss on derivatives	(555)		0
Income from unconsolidated entities	(1,532)		(1,543)
Rental income in excess of cash received	(10,125)		(1,418)
Amortization related to above (below) market leases, net	(252)		(658)
Loss (gain) on sales of properties	(769)		(26,156)
Loss (gain) on extinguishment of debt	0		0
Distributions By Unconsolidated Entities Operating	4,009		0
Increase (decrease) in accrued expenses and other liabilities	(6,156)		56,247
Decrease (increase) in receivables and other assets	(12,873)		(29,644)
Net cash provided from (used in) operating activities	174,044		113,787
Investing activities
Investment in real property, net of cash acquired	(570,200)		(683,352)
Capitalized interest	(2,420)		(4,665)
Investment in real estate loans receivable	(10,661)		(23,112)
Other investments, net of payments	22,438		(2,815)
Principal collected on real estate loans receivable	4,301		12,341
Contributions to unconsolidated entities	0		(602)
Distributions by unconsolidated entities investing	0		980
Decrease (increase) in restricted cash	(13,879)		45,797
Proceeds from sales of real property	32,584		44,048
Net cash provided from (used in) investing activities	(537,837)		(611,380)
Financing activities
Net increase (decrease) under unsecured lines of credit arrangements	(605,000)		(300,000)
Proceeds from issuance of senior unsecured notes	0		1,381,086
Payments to extinguish senior unsecured notes	(22)		0
Net proceeds from the issuance of secured debt	111,000		0
Payments on secured debt	(42,568)		(5,906)
Net proceeds from the issuance of common stock	1,087,777		1,388,118
Net proceeds from the issuance of preferred stock	277,901		696,741
Decrease (increase) in deferred loan expenses	(2,324)		(8,339)
Contributions by noncontrolling interests	8,367	[1]	95	[1]
Distributions to noncontrolling interests	(3,477)	[1]	(7,057)	[1]
Cash distributions to stockholders	(162,126)		(110,720)
Net cash provided from (used in) financing activities	669,528		3,034,018
Increase (decrease) in cash and cash equivalents	305,735		2,536,425
Cash and cash equivalents at beginning of period	163,482		131,570
Cash and cash equivalents at end of period	469,217		2,667,995
Supplemental cash flow information:
Interest paid	96,426		35,081
Income taxes paid	$ 2,596		$ 31

[1] Includes amounts attributable to redeemable noncontrolling interests.