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Mortgage and Other Indebtedness (Operating Properties) (Details) $ in Thousands	1 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($) loan extension_option	Apr. 30, 2016 USD ($)	Jun. 30, 2016 USD ($) loan extension_option	Dec. 31, 2015 USD ($)	May 31, 2016
Mortgages on Operating Properties [Abstract]
Debt instrument, option extension term			24 months
Number of extension options available \| extension_option	1		1
Schedule of principal repayments [Abstract]
2016	$ 327,669		$ 327,669
2017	842,315		842,315
2018	710,542		710,542
2019	126,468		126,468
2020	596,563		596,563
Thereafter	1,990,738		1,990,738
Mortgage and other indebtedness	4,594,295		4,594,295
Net unamortized premiums	(345)		(345)
Total fixed-rate and variable-rate debt	4,593,950		4,593,950	$ 4,726,687
Long-term debt	$ 4,540,479		$ 4,540,479	$ 4,710,628
Weighted average maturity of mortgage and other indebtedness (in years)			4 years 2 months 6 days	4 years 4 months 24 days
Hamilton Place
Mortgages on Operating Properties [Abstract]
Stated Interest Rate (as a percentage)	4.36%		4.36%
Amount Financed or Extended	$ 107,000
Interest rate at repayment date (as a percent)	5.86%		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%	5.85%
Amount Financed or Extended		$ 27,446
Cool Springs 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
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%		5.86%
Operating property loan \| Greenbrier Mall
Schedule of principal repayments [Abstract]
Long-term debt	$ 71,265		$ 71,265
Operating property loan \| Operating Property Loan with 2016 Maturity Date
Schedule of principal repayments [Abstract]
2016	$ 298,485		$ 298,485
Operating property loan \| Principal balance
Schedule of principal repayments [Abstract]
Number of debt instruments \| loan	4		4
Operating property loan \| Principal amortization
Schedule of principal repayments [Abstract]
2016	$ 29,184		$ 29,184
Real estate loan to be retired or refinanced
Schedule of principal repayments [Abstract]
2016	126,464		126,464
Real estate loan to be retired \| Dakota Square Mall
Schedule of principal repayments [Abstract]
Long-term debt	$ 55,199		55,199
Laredo Outlet Shoppes, LLC
Mortgages on Operating Properties [Abstract]
Amount Financed			$ 91,300
Percentage Guaranteed by the Operating Partnership			100.00%
Parent Company \| Laredo Outlet Shoppes, LLC
Mortgages on Operating Properties [Abstract]
Percentage of equity interest in real estate property	65.00%		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%		35.00%
LIBOR \| Laredo Outlet Shoppes, LLC
Mortgages on Operating Properties [Abstract]
Stated Interest Rate (as a percentage)	2.50%		2.50%
LIBOR \| The Outlet Shoppes of 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%		2.25%