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Mortgage Notes Payable - Schedule of Mortgage Notes Payable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	$ 176,442	$ 181,069
Carrying amount of mortgage notes, other	3,908,976	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 (as a 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	$ 199,833	199,766
Effective interest rate (as a percent)	3.77%
Monthly debt service	$ 625
Danbury Fair Mall
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	107,929	111,078
Carrying amount of mortgage notes, other	$ 107,928	111,079
Effective interest rate (as a percent)	5.53%
Monthly debt service	$ 1,538
Deptford Mall One
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 (as a 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 (as a 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	198,966	198,653
Monthly debt service	378
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	$ 115,762	117,708
Effective interest rate (as a 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 (as a 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 (as a 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	$ 220,643	224,836
Effective interest rate (as a percent)	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	323,062	0
Monthly debt service	971
Green Acres Mall
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 297,798	303,960
Effective interest rate (as a 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	$ 456,958	466,266
Effective interest rate (as a 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	$ 63,434	63,783
Effective interest rate (as a percent)	3.50%
Monthly debt service	$ 206
Oaks, The
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 201,235	205,555
Effective interest rate (as a 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	$ 127,311	130,108
Effective interest rate (as a 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 (as a 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	$ 219,564	224,815
Effective interest rate (as a 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	$ 127,724	130,638
Effective interest rate (as a 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	$ 99,520	105,494
Effective interest rate (as a 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	$ 0	67,749
Effective interest rate (as a percent)	0.00%
Monthly debt service	$ 0
Towne Mall
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	0	0
Carrying amount of mortgage notes, other	$ 21,570	21,956
Effective interest rate (as a percent)	4.48%
Monthly debt service	$ 117
Tucson La Encantada
Mortgage loans payable on real estate
Carrying amount of mortgage notes, related party	68,513	69,991
Carrying amount of mortgage notes, other	$ 0	0
Effective interest rate (as a 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	$ 114,559	114,500
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, related party	0	0
Carrying amount of mortgage notes, other	$ 269,228	274,417
Effective interest rate (as a 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	$ 143,881	$ 146,630
Effective interest rate (as a percent)	4.49%
Monthly debt service	$ 783

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