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Mortgage Notes Payable - Schedule of mortgage notes payable (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	$ 167,747	$ 171,569
Carrying Amount of Mortgage Notes, Other	3,917,114	4,066,511
Chandler Fashion Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 199,954	199,904
Effective Interest Rate	3.77%
Monthly Debt Service	$ 625
Danbury Fair Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	101,977	104,599
Carrying Amount of Mortgage Notes, Other	$ 101,977	104,598
Effective Interest Rate	5.53%
Monthly Debt Service	$ 1,538
Fashion Outlets of Chicago
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 199,541	199,298
Effective Interest Rate	3.76%
Monthly Debt Service	$ 600
Fashion Outlets of Niagara Falls USA
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 110,448	112,770
Effective Interest Rate	4.89%
Monthly Debt Service	$ 727
Freehold Raceway
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 398,171	398,050
Effective Interest Rate	3.94%
Monthly Debt Service	$ 1,300
Fresno Fashion Fair
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 323,410	323,261
Effective Interest Rate	3.67%
Monthly Debt Service	$ 971
Green Acres Commons
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 127,776	$ 107,219
Effective Interest Rate	4.81%	4.07%
Monthly Debt Service	$ 460
Green Acres Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	$ 0
Carrying Amount of Mortgage Notes, Other	$ 286,386	291,366
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, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 439,695	447,231
Effective Interest Rate	3.67%
Monthly Debt Service	$ 2,229
Oaks, The
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 193,229	196,732
Effective Interest Rate	4.14%
Monthly Debt Service	$ 1,064
Pacific View
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 122,132	124,397
Effective Interest Rate	4.08%
Monthly Debt Service	$ 668
Queens Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 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, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	296,882	296,366
Monthly Debt Service	865
SanTan Village Regional Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 122,376	124,703
Effective Interest Rate	3.14%
Monthly Debt Service	$ 589
Towne Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 20,842	21,161
Effective Interest Rate	4.48%
Monthly Debt Service	$ 117
Tucson La Encantada
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	65,770	66,970
Carrying Amount of Mortgage Notes, Other	$ 0	0
Effective Interest Rate	4.23%
Monthly Debt Service	$ 368
Victor Valley, Mall of
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 114,660	114,617
Effective Interest Rate	4.00%
Monthly Debt Service	$ 380
Vintage Faire Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 259,635	263,818
Effective Interest Rate	3.55%
Monthly Debt Service	$ 1,256
Westside Pavilion
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 0	$ 141,020
Effective Interest Rate
Monthly Debt Service

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