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Mortgage Notes Payable - Schedule of mortgage notes payable (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 4,373,710	$ 4,392,599
Chandler Fashion Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 255,313	255,174
Effective Interest Rate	4.18%
Monthly Debt Service	$ 875
Danbury Fair Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 191,028	194,718
Effective Interest Rate	5.56%
Monthly Debt Service	$ 1,538
Fashion Outlets of Chicago
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 299,173	299,112
Effective Interest Rate	4.61%
Monthly Debt Service	$ 1,145
Fashion Outlets of Niagara Falls USA
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 103,887	106,398
Effective Interest Rate	4.89%
Monthly Debt Service	$ 727
Freehold Raceway Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 398,503	398,379
Effective Interest Rate	3.94%
Monthly Debt Service	$ 1,300
Fresno Fashion Fair
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 323,808	323,659
Effective Interest Rate	3.67%
Monthly Debt Service	$ 971
Green Acres Commons
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 129,617	$ 128,926
Effective Interest Rate	2.87%	4.40%
Monthly Debt Service	$ 250
Green Acres Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 272,402	$ 277,747
Effective Interest Rate	3.61%
Monthly Debt Service	$ 1,447
Kings Plaza Shopping Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 535,285	535,097
Effective Interest Rate	3.71%
Monthly Debt Service	$ 1,629
Oaks, The
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 186,005	187,142
Effective Interest Rate	4.14%
Monthly Debt Service	$ 1,064
Pacific View
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 115,745	118,202
Effective Interest Rate	4.08%
Monthly Debt Service	$ 668
Queens Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 600,000	600,000
Effective Interest Rate	3.49%
Monthly Debt Service	$ 1,744
Santa Monica Place
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 298,379	297,817
Effective Interest Rate	1.75%
Monthly Debt Service	$ 375
SanTan Village Regional Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 219,209	219,140
Effective Interest Rate	4.34%
Monthly Debt Service	$ 788
Towne Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 19,935	20,284
Effective Interest Rate	4.48%
Monthly Debt Service	$ 117
Tucson La Encantada
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 62,729	63,682
Effective Interest Rate	4.23%
Monthly Debt Service	$ 368
Victor Valley, Mall of
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 114,777	114,733
Effective Interest Rate	4.00%
Monthly Debt Service	$ 380
Vintage Faire Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 247,915	$ 252,389
Effective Interest Rate	3.55%
Monthly Debt Service	$ 1,256

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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