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Mortgage Notes Payable - Schedule of mortgage notes payable (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Oct. 01, 2021	Dec. 31, 2020
Mortgage loans payable on real estate
Long-term Debt	$ 4,432,587		$ 4,560,810
Chandler Fashion Center
Mortgage loans payable on real estate
Long-term Debt	$ 255,502		255,361
Effective Interest Rate (in percent)	4.18%
Monthly Debt Service	$ 875
Danbury Fair Mall
Mortgage loans payable on real estate
Long-term Debt	$ 170,171		186,741
Effective Interest Rate (in percent)	5.71%
Monthly Debt Service	$ 1,538
Fashion District Philadelphia
Mortgage loans payable on real estate
Long-term Debt	$ 194,602		201,000
Effective Interest Rate (in percent)	4.00%
Monthly Debt Service	$ 649
Fashion Outlets of Chicago
Mortgage loans payable on real estate
Long-term Debt	$ 299,253		299,193
Effective Interest Rate (in percent)	4.61%
Monthly Debt Service	$ 1,145
Fashion Outlets of Niagara Falls USA
Mortgage loans payable on real estate
Long-term Debt	$ 97,420		101,463
Effective Interest Rate (in percent)	6.45%
Monthly Debt Service	$ 727
Freehold Raceway Mall
Mortgage loans payable on real estate
Long-term Debt	$ 398,671		398,545
Effective Interest Rate (in percent)	3.94%
Monthly Debt Service	$ 1,300
Fresno Fashion Fair
Mortgage loans payable on real estate
Long-term Debt	$ 324,006		323,857
Effective Interest Rate (in percent)	3.67%
Monthly Debt Service	$ 971
Green Acres Commons
Mortgage loans payable on real estate
Long-term Debt	$ 29,780		129,847
Effective Interest Rate (in percent)	3.10%
Monthly Debt Service	$ 72
Green Acres Commons - Swapped
Mortgage loans payable on real estate
Long-term Debt	$ 95,000		0
Effective Interest Rate (in percent)	5.60%
Monthly Debt Service	$ 444
Green Acres Commons - Swapped | Subsequent event
Mortgage loans payable on real estate
Effective Interest Rate (in percent)		3.10%
Green Acres Mall
Mortgage loans payable on real estate
Long-term Debt	$ 247,537		270,570
Effective Interest Rate (in percent)	3.94%
Monthly Debt Service	$ 1,447
Kings Plaza Shopping Center
Mortgage loans payable on real estate
Long-term Debt	$ 535,799		535,413
Effective Interest Rate (in percent)	3.71%
Monthly Debt Service	$ 1,629
Oaks, The
Mortgage loans payable on real estate
Long-term Debt	$ 178,071		183,108
Effective Interest Rate (in percent)	4.14%
Monthly Debt Service	$ 1,064
Pacific View
Mortgage loans payable on real estate
Long-term Debt	$ 112,351		114,909
Effective Interest Rate (in percent)	4.08%
Monthly Debt Service	$ 668
Queens Center
Mortgage loans payable on real estate
Long-term Debt	$ 600,000		600,000
Effective Interest Rate (in percent)	3.49%
Monthly Debt Service	$ 1,744
Santa Monica Place - Swapped
Mortgage loans payable on real estate
Long-term Debt	$ 299,127		298,566
Effective Interest Rate (in percent)	4.58%
Monthly Debt Service	$ 1,082
Santa Monica Place - Swapped | Subsequent event
Mortgage loans payable on real estate
Effective Interest Rate (in percent)		1.81%
SanTan Village Regional Center
Mortgage loans payable on real estate
Long-term Debt	$ 219,300		219,233
Effective Interest Rate (in percent)	4.34%
Monthly Debt Service	$ 788
Towne Mall
Mortgage loans payable on real estate
Long-term Debt	$ 19,447		19,815
Effective Interest Rate (in percent)	4.48%
Monthly Debt Service	$ 117
Tucson La Encantada
Mortgage loans payable on real estate
Long-term Debt	$ 0		62,018
Effective Interest Rate (in percent)	4.23%
Monthly Debt Service	$ 368
Victor Valley, Mall of
Mortgage loans payable on real estate
Long-term Debt	$ 114,835		114,791
Effective Interest Rate (in percent)	4.00%
Monthly Debt Service	$ 380
Vintage Faire Mall
Mortgage loans payable on real estate
Long-term Debt	$ 241,715		$ 246,380
Effective Interest Rate (in percent)	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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