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MORTGAGE AND OTHER INDEBTEDNESS, NET - Narrative (Details)	1 Months Ended	12 Months Ended
	May 31, 2019 USD ($)	Dec. 31, 2019 USD ($) mall associated_center subsidiary loan mortgage_note_receivable	Apr. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2018 USD ($)
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt		$ 847,275,000				$ 955,751,000
Number of Malls Securing Credit Facility, Collateral | mall		17
Number of Associated Centers Securing Credit Facility, Collateral | associated_center		3
Number of wholly owned subsidiaries | subsidiary		36
Ownership Interest in Guarantor Subsidiary by Operating Partnership, Percent		100.00%
Guarantor Subsidiaries
Debt Instrument [Line Items]
Number of Malls Securing Credit Facility, Collateral | mall		17
Number of Associated Centers Securing Credit Facility, Collateral | associated_center		3
Number of malls not classified as collateral for the secured credit facility | mall		5
Number of associated centers not classified as collateral for the secured credit facility | associated_center		2
Number of Mortgage Notes Receivable not Classified as Collateral | mortgage_note_receivable		4
Unsecured lines of credit
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,100,000,000
Line of Credit | Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 1,185,000,000
Debt Instrument, Interest Rate, Effective Percentage		3.94%
Quarterly Installment Payments on Debt		$ 35,000,000
Line of Credit | Secured Debt | Guarantor Subsidiaries
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 1,185,000,000			1,185,000,000
Line of Credit | Secured Debt | Minimum
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.25%
Line of Credit | Secured Debt | Maximum
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.35%
Unsecured Term Loan
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 695,000,000		$ 500,000,000		$ 695,000,000
Debt Instrument, Number Of Instruments | loan		3
Unsecured Term Loan | Unsecured lines of credit
Debt Instrument [Line Items]
Debt Instrument, Number Of Instruments | loan		3
Unsecured Term Loan | Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 500,000,000
Revolving Credit Facility | Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 685,000,000
Secured Line of Credit
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt		310,925,000
Secured Term Loan
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt		465,000,000
Mortgages | Volusia Mall
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 41,000,000	$ 50,000,000
Stated interest rate (as a percent)		4.56%	8.00%
Mortgages | Laredo Outlet Shoppes L L C
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	35.00%
Letters of Credit Outstanding, Amount	$ 10,800,000
Debt available balance	$ 43,000,000
Mortgages | Guarantor Subsidiaries
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 37,295,000
Debt Instrument, Interest Rate, Effective Percentage							5.75%

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