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Mortgage Notes Payable - Schedule of Mortgage Notes Payable (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jan. 06, 2016	Dec. 31, 2015
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	$ 178,785		$ 181,069
Carrying Amount of Mortgage Notes, Other	3,718,404		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%	4.05%
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	$ 199,803		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	109,525		111,078
Carrying Amount of Mortgage Notes, Other	$ 109,525		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	$ 198,781		198,653
Effective Interest Rate (percent)	2.10%
Monthly Debt Service	$ 323
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	$ 117,203		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	$ 37,000		37,000
Effective Interest Rate (percent)	8.97%
Monthly Debt Service	$ 153
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	$ 222,762		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	$ 300,909		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	$ 461,659		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	$ 63,662		$ 63,783
Effective Interest Rate (percent)	3.35%		3.30%
Monthly Debt Service	$ 143
Oaks, The
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0		$ 0
Carrying Amount of Mortgage Notes, Other	$ 203,418		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	$ 128,723		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	$ 222,209		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	$ 129,192		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	$ 102,543		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	$ 67,599		$ 67,749
Effective Interest Rate (percent)	2.27%		2.17%
Monthly Debt Service	$ 154
Towne Mall
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0		$ 0
Carrying Amount of Mortgage Notes, Other	$ 21,765		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	69,260		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	$ 114,529		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	$ 271,847		274,417
Effective Interest Rate (percent)	3.55%
Monthly Debt Service	$ 1,255
Westside Pavilion
Mortgage loans payable on real estate
Carrying Amount of Mortgage Notes, Related Party	0		0
Carrying Amount of Mortgage Notes, Other	$ 145,275		$ 146,630
Effective Interest Rate (percent)	4.49%
Monthly Debt Service	$ 783

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