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Mortgage Notes Payable - Schedule of Mortgage Notes Payable (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	$ 177,621	$ 181,069
Carrying Amount of Mortgage Notes, Other	3,667,537	4,427,518
Arrowhead Towne Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 0	221,194
Effective Interest Rate (percent)	0.00%
Monthly Debt Service	$ 0
Chandler Fashion Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 199,816	199,766
Effective Interest Rate (percent)	3.77%
Monthly Debt Service	$ 625
Danbury Fair Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	108,733	111,078
Carrying Amount of Mortgage Notes, Other	$ 108,732	111,079
Effective Interest Rate (percent)	5.53%
Monthly Debt Service	$ 1,538
Deptford Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 0	193,337
Effective Interest Rate (percent)	0.00%
Monthly Debt Service	$ 0
Deptford Mall Two
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 0	13,999
Effective Interest Rate (percent)	0.00%
Monthly Debt Service	$ 0
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	$ 198,875	198,653
Effective Interest Rate (percent)	2.18%
Monthly Debt Service	$ 337
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	$ 116,495	117,708
Effective Interest Rate (percent)	4.89%
Monthly Debt Service	$ 727
Flagstaff Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 0	37,000
Effective Interest Rate (percent)	0.00%
Monthly Debt Service	$ 0
FlatIron Crossing
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 0	254,075
Effective Interest Rate (percent)	0.00%
Monthly Debt Service	$ 0
Freehold Raceway Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 221,709	224,836
Effective Interest Rate (percent)	4.20%
Monthly Debt Service	$ 1,132
Green Acres Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 299,375	303,960
Effective Interest Rate (percent)	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	$ 459,342	466,266
Effective Interest Rate (percent)	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	$ 63,549	63,783
Effective Interest Rate (percent)	3.40%
Monthly Debt Service	$ 147
Oaks, The
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 202,332	205,555
Effective Interest Rate (percent)	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	$ 128,021	130,108
Effective Interest Rate (percent)	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 (percent)	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	$ 220,901	224,815
Effective Interest Rate (percent)	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	$ 128,466	130,638
Effective Interest Rate (percent)	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	$ 101,048	105,494
Effective Interest Rate (percent)	1.80%
Monthly Debt Service	$ 640
Superstition Springs Center
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 67,525	67,749
Effective Interest Rate (percent)	2.35%
Monthly Debt Service	$ 159
Towne Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0	0
Carrying Amount of Mortgage Notes, Other	$ 21,670	21,956
Effective Interest Rate (percent)	4.48%
Monthly Debt Service	$ 117
Tucson La Encantada
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	68,888	69,991
Carrying Amount of Mortgage Notes, Other	$ 0	0
Effective Interest Rate (percent)	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	$ 114,544	114,500
Effective Interest Rate (percent)	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	$ 270,556	274,417
Effective Interest Rate (percent)	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	$ 144,581	$ 146,630
Effective Interest Rate (percent)	4.49%
Monthly Debt Service	$ 783

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