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Mortgage and Other Indebtedness (Operating Properties) (Details) $ in Thousands	1 Months Ended			9 Months Ended	12 Months Ended
	Aug. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Apr. 30, 2016 USD ($)	Sep. 30, 2016 USD ($) loan extension_option	Dec. 31, 2015 USD ($)	Jul. 31, 2016 USD ($)	May 31, 2016
Mortgages on Operating Properties [Abstract]
Percentage of equity interest in real estate property				50.00%
Schedule of principal repayments [Abstract]
2016				$ 85,143
2017				840,726
2018				708,861
2019				170,270
2020				609,740
Thereafter				1,942,580
Mortgage and other indebtedness				4,357,320
Net unamortized premiums (discounts)				(988)
Total fixed-rate and variable-rate debt				4,356,332
Unamortized deferred financing costs				(14,705)	$ (16,059)
Total mortgage and other indebtedness				$ 4,531,269	$ 4,710,628
Weighted average maturity of mortgage and other indebtedness (in years)				4 years	4 years 4 months 24 days
Hamilton Place
Mortgages on Operating Properties [Abstract]
Stated Interest Rate (as a percentage)		4.36%
Amount Financed or Extended		$ 107,000
Interest rate at repayment date (as a percent)		5.86%
Principal Balance Repaid		$ 98,181
Statesboro Crossing
Mortgages on Operating Properties [Abstract]
Stated Interest Rate (as a percentage)		1.80%
Amount Financed or Extended		$ 11,035
Debt instrument, option extension term				1 year
Hickory Point Mall
Mortgages on Operating Properties [Abstract]
Stated Interest Rate (as a percentage)			5.85%	5.85%
Amount Financed or Extended			$ 27,446
Dakota Square Mall
Mortgages on Operating Properties [Abstract]
Interest rate at repayment date (as a percent)	6.23%
Principal Balance Repaid	$ 51,605
CoolSprings Crossing
Mortgages on Operating Properties [Abstract]
Interest rate at repayment date (as a percent)			4.54%
Principal Balance Repaid			$ 11,313
Gunbarrel Pointe
Mortgages on Operating Properties [Abstract]
Interest rate at repayment date (as a percent)			4.64%
Principal Balance Repaid			$ 10,083
Stroud Mall
Mortgages on Operating Properties [Abstract]
Interest rate at repayment date (as a percent)			4.59%
Principal Balance Repaid			$ 30,276
York Galleria
Mortgages on Operating Properties [Abstract]
Interest rate at repayment date (as a percent)			4.55%
Principal Balance Repaid			$ 48,337
Mortgages \| Chesterfield Mall, Midland Mall, and Wausau Center
Mortgages on Operating Properties [Abstract]
Debt Instrument, Debt Default, Amount				$ 189,642
Schedule of principal repayments [Abstract]
Total mortgage and other indebtedness				$ 189,642
Number of debt instruments \| loan				3
Mortgages \| Midland Mall and Chesterfield Mall
Schedule of principal repayments [Abstract]
Total mortgage and other indebtedness				$ 171,953
Mortgages \| Wausau Center
Schedule of principal repayments [Abstract]
Total mortgage and other indebtedness				17,689
Operating property loan
Mortgages on Operating Properties [Abstract]
Debt retired		$ 98,181
Operating property loan \| Hamilton Place
Mortgages on Operating Properties [Abstract]
Stated Interest Rate (as a percentage)		5.86%
Operating property loan \| Operating Property Loan with 2016 Maturity Date
Schedule of principal repayments [Abstract]
2016				70,801
Operating property loan \| Principal amortization
Schedule of principal repayments [Abstract]
2016				$ 14,342
Laredo Outlet Shoppes, LLC
Mortgages on Operating Properties [Abstract]
Debt instrument, option extension term				24 months
Amount Financed				$ 91,300
Percentage Guaranteed by the Operating Partnership				100.00%
Number of extension options available \| extension_option				1
Fashion Square \| Mortgages
Mortgages on Operating Properties [Abstract]
Stated Interest Rate (as a percentage)						4.95%
Mortgage note payables assumed						$ 38,237
Parent Company \| Laredo Outlet Shoppes, LLC
Mortgages on Operating Properties [Abstract]
Percentage of equity interest in real estate property				65.00%			65.00%
Corporate Joint Venture \| Laredo Outlet Shoppes, LLC
Mortgages on Operating Properties [Abstract]
Percentage of equity interest in real estate property				35.00%			35.00%
LIBOR \| Laredo Outlet Shoppes, LLC
Mortgages on Operating Properties [Abstract]
Stated Interest Rate (as a percentage)				2.50%
LIBOR \| The Outlet Shoppes at Laredo, once development is complete and certain debt and operational metrics are met
Mortgages on Operating Properties [Abstract]
Stated Interest Rate (as a percentage)				2.25%