Consolidated Statements of Cash Flows $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Cash Flows from Operating Activities:
Net income	$ 277,378	$ 575,886
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization (including amortization of deferred financing costs)	446,040	420,494
Real estate impairment losses	161,165	256
Net gain on disposition of wholly owned and partially owned assets	(160,225)	(104,897)
Straight-lining of rental income	(118,798)	(108,529)
Return of capital from real estate fund investments	71,888	91,036
Distributions of income from partially owned entities	58,692	51,650
Amortization of below-market leases, net	(41,676)	(45,918)
Other non-cash adjustments	33,971	35,190
Net realized and unrealized gains on real estate fund investments	(16,513)	(38,781)
Net gains on sale of real estate and other	(5,074)	(65,396)
Equity in net (income) loss of partially owned entities	(529)	7,961
Reversal of allowance for deferred tax assets	0	(90,030)
Changes in operating assets and liabilities:
Real estate fund investments	0	(95,010)
Tenant and other receivables, net	(578)	1,892
Prepaid assets	(71,068)	(77,899)
Other assets	(50,938)	(92,413)
Accounts payable and accrued expenses	6,530	(5,799)
Other liabilities	(16,018)	(16,168)
Net cash provided by operating activities	574,247	443,525
Cash Flows from Investing Activities:
Development costs and construction in progress	(426,641)	(339,586)
Additions to real estate	(261,971)	(207,845)
Proceeds from sales of real estate and related investments	138,034	375,850
Investments in partially owned entities	(112,797)	(144,890)
Distributions of capital from partially owned entities	100,997	31,822
Acquisitions of real estate and other	(46,801)	(388,565)
Net deconsolidation of 7 West 34th Street	(42,000)	0
Restricted cash	(24,796)	201,895
Investments in loans receivable and other	(11,700)	(25,845)
Purchases of marketable securities	(4,379)	0
Proceeds from sales and repayments of mortgage and mezzanine loans receivable and other	33	16,781
Net cash used in investing activities	(692,021)	(480,383)
Cash Flows from Financing Activities:
Proceeds from borrowings	2,000,604	2,876,460
Repayments of borrowings	(1,591,554)	(2,539,677)
Dividends paid on common shares	(356,863)	(355,945)
Redemption of preferred shares	(246,250)	0
Distributions to noncontrolling interests	(95,055)	(93,738)
Dividends paid on preferred shares	(64,006)	(60,213)
Debt issuance and other costs	(30,846)	(37,467)
Contributions from noncontrolling interests	11,900	51,725
Proceeds received from exercise of employee share options	7,020	15,273
Repurchase of shares related to stock compensation agreements and related tax withholdings and other	(186)	(4,900)
Cash included in the spin-off of Urban Edge Properties	0	(225,000)
Net cash used in financing activities	(365,236)	(373,482)
Net decrease in cash and cash equivalents	(483,010)	(410,340)
Cash and cash equivalents at beginning of period	1,835,707	1,198,477
Cash and cash equivalents at end of period	1,352,697	788,137
Supplemental Disclosure Of Cash Flow Information:
Cash payments for interest, excluding capitalized interest of $21,297 and $40,924	275,979	256,254
Cash payments for income taxes	7,602	7,640
Non-Cash Investing and Financing Activities:
Write-off of fully depreciated assets	(283,496)	(127,788)
Accrued capital expenditures included in accounts payable and accrued expenses	129,704	95,535
Change in unrealized net gain on securities available-for-sale	42,798	(53,396)
Adjustments to carry redeemable Class A units at redemption value	(30,260)	295,713
Decrease in assets and liabilities resulting from the deconsolidation of investments that were previously consolidated
Real estate, net	(122,047)	0
Mortgages payable, net	(290,418)	0
Non-cash distribution of Urban Edge Properties:
Assets	0	1,722,263
Liabilities	0	(1,482,660)
Equity	0	(239,603)
Transfer of interest in real estate to Pennsylvania Real Estate Investment Trust	0	(145,313)
Class A units in connection with acquisition		80,000
Financing assumed in acquisitions		62,000
Acquisitions
Non-cash distribution of Urban Edge Properties:
Like-kind exchange of real estate	46,698	80,269
Dispositions
Non-cash distribution of Urban Edge Properties:
Like-kind exchange of real estate	$ (29,639)	$ (213,621)