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Mortgage Notes Payable - Schedule of mortgage notes payable (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Mortgage loans payable on real estate
Long-term Debt	$ 4,518,108	$ 4,560,810
Chandler Fashion Center
Mortgage loans payable on real estate
Long-term Debt	$ 255,453	255,361
Effective Interest Rate	4.18%
Monthly Debt Service	$ 875
Danbury Fair Mall
Mortgage loans payable on real estate
Long-term Debt	$ 182,693	186,741
Effective Interest Rate	5.53%
Monthly Debt Service	$ 1,538
Fashion District Philadelphia
Mortgage loans payable on real estate
Long-term Debt	$ 194,602	201,000
Effective Interest Rate	4.00%
Monthly Debt Service	$ 649
Fashion Outlets of Chicago
Mortgage loans payable on real estate
Long-term Debt	$ 299,233	299,193
Effective Interest Rate	4.61%
Monthly Debt Service	$ 1,145
Fashion Outlets of Niagara Falls USA
Mortgage loans payable on real estate
Long-term Debt	$ 97,901	101,463
Effective Interest Rate	6.45%
Monthly Debt Service	$ 727
Freehold Raceway Mall
Mortgage loans payable on real estate
Long-term Debt	$ 398,629	398,545
Effective Interest Rate	3.94%
Monthly Debt Service	$ 1,300
Fresno Fashion Fair
Mortgage loans payable on real estate
Long-term Debt	$ 323,957	323,857
Effective Interest Rate	3.67%
Monthly Debt Service	$ 971
Green Acres Commons
Mortgage loans payable on real estate
Long-term Debt	$ 29,685	129,847
Effective Interest Rate	3.11%
Monthly Debt Service	$ 72
Green Acres Commons - Swapped
Mortgage loans payable on real estate
Long-term Debt	$ 95,000	0
Effective Interest Rate	5.60%
Monthly Debt Service	$ 444
Green Acres Mall
Mortgage loans payable on real estate
Long-term Debt	$ 255,764	270,570
Effective Interest Rate	3.94%
Monthly Debt Service	$ 1,447
Kings Plaza Shopping Center
Mortgage loans payable on real estate
Long-term Debt	$ 535,670	535,413
Effective Interest Rate	3.71%
Monthly Debt Service	$ 1,629
Oaks, The
Mortgage loans payable on real estate
Long-term Debt	$ 179,408	183,108
Effective Interest Rate	4.14%
Monthly Debt Service	$ 1,064
Pacific View
Mortgage loans payable on real estate
Long-term Debt	$ 113,212	114,909
Effective Interest Rate	4.08%
Monthly Debt Service	$ 668
Queens Center
Mortgage loans payable on real estate
Long-term Debt	$ 600,000	600,000
Effective Interest Rate	3.49%
Monthly Debt Service	$ 1,744
Santa Monica Place - Swapped
Mortgage loans payable on real estate
Long-term Debt	$ 298,940	298,566
Effective Interest Rate	4.58%
Monthly Debt Service	$ 1,082
SanTan Village Regional Center
Mortgage loans payable on real estate
Long-term Debt	$ 219,277	219,233
Effective Interest Rate	4.34%
Monthly Debt Service	$ 788
Towne Mall
Mortgage loans payable on real estate
Long-term Debt	$ 19,569	19,815
Effective Interest Rate	4.48%
Monthly Debt Service	$ 117
Tucson La Encantada
Mortgage loans payable on real estate
Long-term Debt	$ 61,026	62,018
Effective Interest Rate	4.23%
Monthly Debt Service	$ 368
Victor Valley, Mall of
Mortgage loans payable on real estate
Long-term Debt	$ 114,820	114,791
Effective Interest Rate	4.00%
Monthly Debt Service	$ 380
Vintage Faire Mall
Mortgage loans payable on real estate
Long-term Debt	$ 243,269	$ 246,380
Effective Interest Rate	3.55%
Monthly Debt Service	$ 1,256

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