Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash Flows from Operating Activities:
Net income	$ 576,790	$ 309,755
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization (including amortization of deferred financing costs)	273,980	280,058
Equity in income of partially owned entities including ToysRUs	(132,785)	(120,662)
Net (gain) loss on early extinguishment of debt	(83,907)	1,072
Mezzanine loans loss reversal and net gain on disposition	(82,744)	6,900
Net gain on sale of real estate	(51,623)	0
Distributions of income from partially owned entities	43,741	18,517
Amortization of below-market leases, net	(33,704)	(32,209)
Straight-lining of rental income	(22,291)	(38,557)
Other non-cash adjustments	15,173	17,007
Unrealized gain on Real Estate Fund assets	(13,570)	0
Income from the mark-to-market of J.C. Penney derivative position	(10,401)	0
Net gain on disposition of wholly owned and partially owned assets	(6,677)	(7,687)
Litigation loss accrual	0	10,056
Changes in operating assets and liabilities:
Real Estate Fund Investments	(97,802)	0
Prepaid assets	(117,503)	79,289
Other assets	(10,424)	(25,691)
Accounts payable and accrued expenses	13,250	23,576
Accounts receivable, net	(11,478)	(400)
Other liabilities	12,015	11,341
Net cash provided by operating activities	260,040	532,365
Cash Flows from Investing Activities:
Investments in partially owned entities	(426,376)	(41,920)
Distributions of capital from partially owned entities	271,375	12,638
Proceeds from sales of real estate and related investments	130,789	49,544
Proceeds from sales and repayments of mezzanine loans	99,990	105,061
Restricted cash	91,127	133,888
Additions to real estate	(86,944)	(68,925)
Investments in mezzanine loans receivable and other	(43,516)	(48,339)
Development costs and construction in progress	(32,489)	(68,499)
Proceeds from sales of, and return of investment in, marketable securities	19,301	122,956
Proceeds from maturing short-term investments	0	40,000
Proceeds from sales of, and return of investment in, marketable securities	0	(13,917)
Acquisitions of real estate and other	0	(15,128)
Net cash provided by (used in) investing activities	23,257	207,359
Cash Flows from Financing Activities:
Repayments of borrowings	(1,636,817)	(1,197,525)
Proceeds from borrowings	1,284,167	901,040
Dividends paid on common shares	(254,099)	(236,279)
Proceeds from the issuance of Series J preferred shares	214,538	0
Contributions from noncontrolling interests	109,605	0
Distributions to noncontrolling interests	(62,111)	(27,665)
Dividends paid on preferred shares	(27,117)	(28,533)
Debt issuance and other costs	(23,319)	(5,724)
Proceeds received from exercise of employee share options	21,330	9,827
Purchase of outstanding preferred units and shares	(8,000)	(13,000)
Repurchase of shares related to stock compensation agreements and related tax withholdings	(748)	(25,223)
Net cash used in financing activities	(382,571)	(623,082)
Net (decrease) increase in cash and cash equivalents	(99,274)	116,642
Cash and cash equivalents at beginning of period	690,789	535,479
Cash and cash equivalents at end of period	591,515	652,121
Supplemental Disclosure of Cash Flow Information:
Cash payments for interest (including capitalized interest of $0 and $875)	256,776	270,997
Cash payments for income taxes	5,416	3,861
Non-Cash Investing and Financing Activities:
Change in unrealized gain on securities available-for-sale	40,844	25,531
Contribution During Period Of Mezzanine Loans To Joint Ventures	73,750
Exchange of real estate	(45,625)
Adjustment to carry redeemable Class A units at redemption value	(104,693)	(66,075)
Common shares issued upon redemption of Class A units, at redemption value	35,208	35,711
Extinguishment of a liability in connection with the acquisition of real estate		20,500
Decrease in assets and liabilities resulting from deconsolidation of discontinued operations:
Assets related to discontinued operations	(145,333)
Liabilities related to discontinued operations	(232,502)
Write-off of fully depreciated assets	(32,794)	(31,079)
Toys R Us [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in income of partially owned entities including ToysRUs	(90,098)	(104,866)
All Equity Method Investees Excluding Toys [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in income of partially owned entities including ToysRUs	$ (42,687)	$ (15,796)