Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash Flows from Operating Activities:
Net income	$ 263,843	$ 471,248
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization (including amortization of deferred financing costs)	288,187	289,643
Return of capital from Real Estate Fund investments	140,920	56,664
Net realized and unrealized gains on Real Estate Fund investments	(111,227)	(47,109)
Equity in net loss of partially owned entities, including Toys R Us	51,763	12,864
Straight-lining of rental income	(33,413)	(32,730)
Distributions of income from partially owned entities	25,784	23,774
Amortization of below-market leases, net	(22,624)	(28,511)
Impairment losses	20,842	4,007
Other non-cash adjustments	20,546	42,339
Net (gain) loss on disposition of wholly owned and partially owned assets	(10,540)	35,719
Defeasance cost in connection with the refinancing of mortgage notes payable	5,589	0
Net gains on sale of real estate	0	(267,994)
Non-cash impairment loss on J.C. Penney common shares	0	39,487
Loss from the mark-to-market of J.C. Penney derivative position	0	13,475
Changes in operating assets and liabilities:
Real Estate Fund investments	(2,666)	(30,893)
Accounts receivable, net	(2,355)	53,821
Prepaid assets	(138,884)	(104,149)
Other assets	(43,842)	(35,570)
Accounts payable and accrued expenses	2,157	(50,690)
Other liabilities	(6,437)	(595)
Net cash provided by operating activities	447,643	444,800
Cash Flows from Investing Activities:
Development costs and construction in progress	(214,615)	(85,550)
Proceeds from sales of real estate and related investments	125,037	648,167
Additions to real estate	(105,116)	(113,060)
Restricted cash	102,087	16,596
Proceeds from repayments of mortgage and mezzanine loans receivable and other	96,159	47,950
Investments in partially owned entities	(62,894)	(59,472)
Acquisitions of real estate and other	(8,963)	(53,992)
Distributions of capital from partially owned entities	1,791	281,991
Proceeds from the sale of LNR	0	240,474
Proceeds from sales of marketable securities	0	160,715
Funding of J.C. Penney derivative collateral	0	(98,447)
Return of J.C. Penney derivative collateral	0	85,450
Investment in mortgage and mezzanine loans receivable	0	(137)
Net cash (used in) provided by investing activities	(66,514)	1,070,685
Cash Flows from Financing Activities:
Proceeds from borrowings (in US Dollars)	1,398,285	1,583,357
Repayments of borrowings	(313,444)	(2,800,441)
Dividends paid on common shares	(273,694)	(272,825)
Purchase of marketable securities in connection with the defeasance of mortgage notes payable	(198,884)	0
Distributions to noncontrolling interests	(149,944)	(181,510)
Dividends paid on preferred shares	(40,737)	(42,451)
Debt issuance costs	(29,560)	(9,520)
Proceeds received from exercise of employee share options	10,125	4,470
Contributions from noncontrolling interests	5,297	33,967
Repurchase of shares related to stock compensation agreements and/or related tax withholdings	(637)	(332)
Purchases of outstanding preferred units and shares	0	(299,400)
Proceeds from the issuance of preferred shares	0	290,536
Net cash provided by (used in) financing activities	406,807	(1,694,149)
Net increase (decrease) in cash and cash equivalents	787,936	(178,664)
Cash and cash equivalents at beginning of period	583,290	960,319
Cash and cash equivalents at end of period	1,371,226	781,655
Supplemental Disclosure Of Cash Flow Information:
Cash payments for interest, excluding capitalized interest of $30,182 and $17,492	214,239	235,588
Cash payments for income taxes	6,726	4,732
Non-cash Investing and Financing Activities:
Marketable securities transferred in connection with the defeasance of mortgage notes payable	198,884	0
Defeasance of mortgage notes payable	(193,406)	0
Elimination of a mortgage and mezzanine loan asset and liability	59,375	0
Transfer of interest in Real Estate Fund to an unconsolidated joint venture	(58,564)	0
Transfer of noncontrolling interest in Real Estate Fund	(33,028)	0
Decrease in assets and liabilities resulting from deconsolidation of Independance Plaza:
Real estate, Net	0	(852,166)
Notes and mortgages payable	0	(322,903)
Cash restricted for like kind exchange of real estate	$ 0	$ (155,810)