Mortgage Notes Payable - Schedule of mortgage notes payable (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 4,259,503	$ 4,423,554
Chandler Fashion Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 255,689	255,548
Effective Interest Rate (as a percent)	4.18%
Monthly Debt Service	$ 875
Danbury Fair Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 150,522	168,037
Effective Interest Rate (as a percent)	6.05%
Monthly Debt Service	$ 1,538
Fashion District Philadelphia
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 111,544	194,602
Effective Interest Rate (as a percent)	6.06%
Monthly Debt Service	$ 564
Fashion Outlets of Chicago
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 299,334	299,274
Effective Interest Rate (as a percent)	4.61%
Monthly Debt Service	$ 1,145
Fashion Outlets of Niagara Falls USA
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 91,903	95,329
Effective Interest Rate (as a percent)	6.45%
Monthly Debt Service	$ 727
Freehold Raceway Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 398,836	398,711
Effective Interest Rate (as a percent)	3.94%
Monthly Debt Service	$ 1,300
Fresno Fashion Fair
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 324,205	324,056
Effective Interest Rate (as a percent)	3.67%
Monthly Debt Service	$ 971
Green Acres Commons
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 125,161	124,875
Effective Interest Rate (as a percent)	5.58%
Monthly Debt Service	$ 555
Green Acres Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 239,639	246,061
Effective Interest Rate (as a percent)	3.94%
Monthly Debt Service	$ 1,447
Kings Plaza Shopping Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 536,313	535,928
Effective Interest Rate (as a percent)	3.71%
Monthly Debt Service	$ 1,629
Oaks, The
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 167,050	176,721
Effective Interest Rate (as a percent)	5.49%
Monthly Debt Service	$ 1,138
Pacific View
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 70,927	111,481
Effective Interest Rate (as a percent)	5.45%
Monthly Debt Service	$ 328
Queens Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 600,000	600,000
Effective Interest Rate (as a percent)	3.49%
Monthly Debt Service	$ 1,744
Santa Monica Place - Swapped
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 299,875	299,314
Effective Interest Rate (as a percent)	4.54%
Monthly Debt Service	$ 1,073
SanTan Village Regional Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 219,391	219,323
Effective Interest Rate (as a percent)	4.34%
Monthly Debt Service	$ 788
Towne Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 18,934	19,320
Effective Interest Rate (as a percent)	4.48%
Monthly Debt Service	$ 117
Victor Valley, Mall of
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 114,893	114,850
Effective Interest Rate (as a percent)	4.00%
Monthly Debt Service	$ 380
Vintage Faire Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes	$ 235,287	$ 240,124
Effective Interest Rate (as a percent)	3.55%
Monthly Debt Service	$ 1,256