Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011
Operating activities
Net income	$ 134,329		$ 118,018
Adjustments to reconcile net income to net cash provided from (used in) operating activities:
Depreciation and amortization	260,385		185,821
Other amortization expenses	8,519		7,900
Provision for loan losses	0		416
Impairment of assets	0		202
Stock-based compensation expense	13,634		7,274
Unrealized loss (gain) on derivatives	2,121		0
Loss (gain) on extinguishment of debt	576		0
Income from unconsolidated entities	(2,989)		(2,514)
Rental income in excess of cash received	(20,793)		(9,304)
Amortization related to above (below) market leases, net	(205)		(1,056)
Loss (gain) on sales of properties	(33,219)		(56,380)
Distributions by unconsolidated entities	4,123		0
Increase (decrease) in accrued expenses and other liabilities	16,355		38,416
Decrease (increase) in receivables and other assets	(27,556)		(47,195)
Net cash provided from (used in) operating activities	351,038		241,598
Investing activities
Investment in real property, net of cash acquired	(1,158,266)		(3,370,597)
Capitalized interest	(4,558)		(6,979)
Investment in real estate loans receivable	(20,354)		(28,467)
Other investments, net of payments	20,147		1,743
Principal collected on real estate loans receivable	12,861		138,396
Contributions to unconsolidated entities	(227,554)		(779)
Distributions by unconsolidated entities	0		1,069
Proceeds from (payments on) derivatives	2,217		0
Decrease (increase) in restricted cash	(9,024)		42,023
Proceeds from sales of real property	156,689		208,692
Net cash provided from (used in) investing activities	(1,227,842)		(3,014,899)
Financing activities
Net increase (decrease) under unsecured lines of credit arrangements	(217,000)		(300,000)
Proceeds From Issuance Of Unsecured Debt	593,319		1,381,086
Payments to extinguish senior unsecured notes	(125,585)		0
Secured debt issued	139,395		58,470
Payments on secured debt	(254,175)		(13,081)
Net proceeds from the issuance of common stock	1,120,265		1,421,495
Net proceeds from the issuance of preferred stock	277,688		696,437
Redemption of preferred stock	275,000		0
Decrease (increase) in deferred loan expenses	(4,698)		(11,603)
Contributions by noncontrolling interests	11,110	[1]	9,087	[1]
Distributions to noncontrolling interests	(9,673)	[1]	(16,804)	[1]
Cash distributions to stockholders	(337,429)		(254,598)
Net cash provided from (used in) financing activities	918,217		2,970,489
Effect of foreign currency translation on cash and cash equivalents	0		0
Increase (decrease) in cash and cash equivalents	41,413		197,188
Cash and cash equivalents at beginning of period	163,482		131,570
Cash and cash equivalents at end of period	204,895		328,758
Supplemental cash flow information:
Interest paid	180,460		112,711
Income taxes paid	$ 2,729		$ 31

[1] Includes amounts attributable to redeemable noncontrolling interests.