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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% |  |  |

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