CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows From Operating Activities:
Net income	$ 330,374,000	$ 115,742,000	$ 112,757,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	188,407,000	179,275,000	167,806,000
Provision for bad debts (Note 1)		3,728,000	11,025,000
Gains on partial dispositions of ownership interests in UJVs, net of tax (Note 2)	(154,466,000)
Gains on remeasurements of ownership interests in UJVs (Note 2)	(164,639,000)
Gain on Saks settlement - The Mall of San Juan (Note 15)	10,095,000
Impairment charge (Note 1)	72,232,000	0	0
Gains on sales of peripheral land		1,034,000	(945,000)
Gain on Simon common share conversion (Note 7)			(11,613,000)
Fluctuation in fair value of equity securities (Notes 1 and 7)	(3,492,000)	(2,801,000)
Income (loss) from UJVs net of distributions	3,981,000	(1,429,000)	845,000
Non-cash operating lease expense	2,074,000
Other	12,905,000	14,730,000	17,285,000
Increase (decrease) in cash attributable to changes in assets and liabilities:
Receivables, deferred charges, and other assets	(21,670,000)	(17,141,000)	(26,420,000)
Accounts payable and other liabilities	(1,838,000)	2,762,000	7,634,000
Net Cash Provided By Operating Activities	253,773,000	293,832,000	278,374,000
Cash Flows From Investing Activities:
Additions to properties	(196,343,000)	(289,854,000)	(353,322,000)
Partial reimbursement of Saks anchor allowance at The Mall of San Juan (Note 15)	20,000,000
Proceeds from partial dispositions of ownership interests in UJVs (Note 2)	285,334,000
Proceeds from sales of peripheral land		1,260,000	1,300,000
Proceeds from sale of equity securities (Note 7)	52,077,000	54,703,000
Insurance proceeds for capital items at The Mall of San Juan (Note 15)	948,000	5,768,000
Contributions to UJVs (Note 2)	(70,972,000)	(95,329,000)	(32,990,000)
Distributions from UJVs in excess of income (Note 2)	6,181,000	(2,173,000)	70,002,000
Other	93,000	89,000	86,000
Net Cash Provided By (Used In) Investing Activities	97,318,000	(325,536,000)	(314,924,000)
Cash Flows From Financing Activities:
Proceeds from (payments to) revolving lines of credit, net	(84,675,000)	255,020,000	269,955,000
Debt proceeds	10,080,000	800,000,000	336,749,000
Debt payments	(36,912,000)	(778,549,000)	(308,673,000)
Debt issuance costs	(7,622,000)	(5,112,000)	(6,665,000)
Issuance of common stock and/or TRG Units in connection with incentive plans	(816,000)	(2,396,000)	6,289,000
Distributions to noncontrolling interests (Note 9)	(78,671,000)	(68,028,000)	(74,661,000)
Distributions to participating securities of TRG	(2,413,000)	(2,396,000)	(2,300,000)
Cash dividends to preferred shareholders	(23,138,000)	(23,138,000)	(23,138,000)
Cash dividends to common shareholders	(165,220,000)	(159,858,000)	(151,828,000)
Net Cash Provided By (Used In) Financing Activities	(389,387,000)	15,543,000	45,728,000
Effect of Exchange Rate on Cash and Cash Equivalents	(1,215,000)	(5,314,000)	2,261,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(39,511,000)	(21,475,000)	11,439,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents at Beginning of Year	142,929,000	164,404,000	152,965,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents at End of Year	$ 103,418,000	$ 142,929,000	$ 164,404,000