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Mortgage Notes Payable - Footnotes (Details) - USD ($) $ in Thousands				12 Months Ended
	Sep. 15, 2021	Mar. 25, 2021	Jan. 22, 2021	Dec. 31, 2021	Dec. 31, 2020
Mortgage loans payable on real estate
Unamortized deferred finance costs				$ 11,946	$ 14,085
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
Green Acres Commons
Mortgage loans payable on real estate
Repayments of debt		$ 4,680
Extension term		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			1 year
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%

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