Consolidated Statements of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating Activities
Net income	$ 659,567	$ 301,197
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	212,558	178,404
Equity in net income from unconsolidated joint ventures	(7,663)	(32,925)
Distributions of cumulative earnings from unconsolidated joint ventures	9,787	19,423
Equity in net gain on sale of interest in unconsolidated joint venture	(3,032)	(127,289)
Purchase price fair value adjustment	(489,889)
Gain on sale of discontinued operations	(46,085)	(35,485)
Gain on sale of debt securities	(19,840)
Loan loss and other investment reserves, net of recoveries	(1,870)	12,323
Loss on investments in marketable securities	133	285
(Gain) loss on early extinguishment of debt	(904)	1,900
Deferred rents receivable	(64,600)	(30,472)
Other non-cash adjustments	3,158	(12,607)
Changes in operating assets and liabilities:
Restricted cash - operations	1,757	(5,717)
Tenant and other receivables	(3,130)	(3,352)
Related party receivables	524	1,609
Deferred lease costs	(25,483)	(27,331)
Other assets	(11,994)	(1,404)
Accounts payable, accrued expenses and other liabilities	12,692	10,272
Deferred revenue and land leases payable	12,010	5,218
Net cash provided by operating activities	237,696	254,049
Investing Activities
Acquisitions of real estate property	(331,972)	(183,750)
Additions to land, buildings and improvements	(111,485)	(55,389)
Escrowed cash - capital improvements/acquisition deposits	39,886	(5,979)
Investments in unconsolidated joint ventures	(95,611)	(83,355)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	107,753	15,160
Net proceeds from disposition of real estate/joint venture interest	160,548	623,121
Other investments	(16,374)	(7,811)
Debt and preferred equity and other investments, net of repayments/participations	(254,264)	(127,007)
Net cash (used in) provided by investing activities	(501,519)	174,990
Financing Activities
Proceeds from mortgages and other loans payable	740,000	166,892
Repayments of mortgages and other loans payable	(754,358)	(133,887)
Proceeds from revolving credit facility and senior unsecured notes	1,401,068	303,306
Repayments of revolving credit facility and senior unsecured notes	(1,393,144)	(873,940)
Contributions of proceeds from stock options exercised and DRIP issuance	8,278	14,245
Contributions of net proceeds from sale of common stock	516,350
Contributions of net proceeds from sale of preferred stock		122,019
Purchase of treasury stock	(4,313)	(517)
Distributions to noncontrolling interests in other partnerships	(143,474)	(10,952)
Contributions from noncontrolling interests in other partnerships		2,782
Redemption of limited partners interests in the Operating Partnership		(11,096)
Distributions to limited partners in the Operating Partnership	(572)	(387)
Distributions paid on common and preferred units	(47,684)	(43,607)
Deferred loan costs, capitalized lease obligation and other obligations	3,347	(36,809)
Net cash used in financing activities	325,498	(501,951)
Net increase (decrease) in cash and cash equivalents	61,675	(72,912)
Cash and cash equivalents at beginning of period	332,830	343,715
Cash and cash equivalents at end of period	$ 394,505	$ 270,803