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Mortgage Notes Payable - Footnotes (Details) - USD ($) $ in Thousands								9 Months Ended
	Aug. 26, 2022	Jul. 01, 2022	May 06, 2022	Apr. 29, 2022	Sep. 15, 2021	Mar. 25, 2021	Jan. 22, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Mortgage loans payable on real estate
Unamortized deferred finance costs								$ 11,368		$ 11,946
Proceeds from mortgages, bank and other notes payable								$ 130,000	$ 495,000
Chandler Fashion Center
Mortgage loans payable on real estate
Interest in the loan assumed by a third party (as a percent)								49.90%
Freehold Raceway Mall
Mortgage loans payable on real estate
Interest in the loan assumed by a third party (as a percent)								49.90%
Danbury Fair Mall
Mortgage loans payable on real estate
Repayments of debt		$ 10,000			$ 10,000
Interest rate on debt (as a percent)		5.50%
Fashion District Philadelphia
Mortgage loans payable on real estate
Repayments of debt	$ 83,058
Green Acres Commons
Mortgage loans payable on real estate
Repayments of debt						$ 4,680
Extension term (in years)						2 years
Green Acres Commons | LIBOR
Mortgage loans payable on real estate
Variable interest rate spread (as a percent)						2.75%
Green Acres Mall
Mortgage loans payable on real estate
Repayments of debt							$ 9,000
Extension term (in years)							1 year
Oaks, The
Mortgage loans payable on real estate
Repayments of debt			$ 5,000
Interest rate on debt (as a percent)			5.25%
Extension term (in years)			2 years
Pacific View
Mortgage loans payable on real estate
Interest rate on debt (as a percent)				5.29%
Proceeds from mortgages, bank and other notes payable				$ 72,000
Santa Monica Place
Mortgage loans payable on real estate
Extension term (in years)								3 years
Santa Monica Place | LIBOR
Mortgage loans payable on real estate
Variable interest rate spread (as a percent)								1.48%
Interest rate cap (as a percent)								4.00%
Santa Monica Place | SOFR
Mortgage loans payable on real estate
Variable interest rate spread (as a percent)								1.58%

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