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Mortgage Notes Payable - Schedule of Mortgage Notes Payable (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	$ 172,810	$ 176,442
Carrying Amount of Mortgage Notes, Other	3,910,864	3,908,976
Chandler Fashion Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 199,885	199,833
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	105,448	107,929
Carrying Amount of Mortgage Notes, Other	$ 105,448	107,928
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	$ 199,218	198,966
Effective interest rate	2.90%
Monthly Debt Service	$ 457
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	$ 113,534	115,762
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	$ 217,379	220,643
Effective interest rate	4.20%
Monthly Debt Service	$ 1,132
Fresno Fashion Fair
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 323,208	323,062
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	$ 107,446	0
Effective interest rate	3.96%
Monthly Debt Service	$ 312
Green Acres Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 293,004	297,798
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	$ 449,709	456,958
Effective interest rate	3.67%
Monthly Debt Service	$ 2,229
Northgate Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 0	63,434
Effective interest rate	0.00%
Monthly Debt Service	$ 0
Oaks, The
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 197,875	201,235
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	$ 125,136	127,311
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	$ 215,508	219,564
Effective interest rate	2.99%
Monthly Debt Service	$ 1,004
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	$ 125,470	127,724
Effective interest rate	3.14%
Monthly Debt Service	$ 589
Stonewood Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 94,994	99,520
Effective interest rate	1.80%
Monthly Debt Service	$ 640
Towne Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 21,266	21,570
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	67,362	68,513
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	$ 114,602	114,559
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	$ 265,195	269,228
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	$ 141,987	$ 143,881
Effective interest rate	4.49%
Monthly Debt Service	$ 783

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