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MORTGAGE AND OTHER INDEBTEDNESS, NET (Fixed Rate Loans Repaid) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Aug. 31, 2017 | Jun. 30, 2017 | Apr. 30, 2017 | Mar. 31, 2017 | Feb. 28, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Aug. 31, 2016 | Jun. 30, 2016 | Apr. 30, 2016 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jul. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  |  |  |  |  |  |  |  | $ 427,247 | $ 291,607 |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | 30,927 |  | $ 256 |
Mortgage and other indebtedness, net |  |  |  |  |  |  |  |  |  |  |  |  | 4,230,845 | $ 4,465,294 |  |
The Plaza at Fayette, Lexington, KY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 5.67% |  |  |  |  |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  |  | $ 37,146 |  |  |  |  |  |  |  |  |
The Shoppes at St. Clair Square, Fairview Heights, IL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 5.67% |  |  |  |  |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  |  | $ 18,827 |  |  |  |  |  |  |  |  |
Hamilton Corner, Chattanooga, TN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 5.67% |  |  |  |  |  |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  | $ 14,227 |  |  |  |  |  |  |  |  |  |
Layton Hills Mall, Layton, UT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 5.66% |  |  |  |  |  |  |  |  |  |  |
Principal Balance Repaid |  |  |  |  | $ 89,526 |  |  |  |  |  |  |  |  |  |  |
The Outlet Shoppes at Oklahoma City, Oklahoma City, OK |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 5.73% |  |  |  |  |  |  |  |  |  |  |  |
Principal Balance Repaid |  |  |  | $ 53,386 |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  | $ (8,500) |  |  |  |  |  |  |  |  |  |  |  |
Outlet Shoppes at Oklahoma City - Phase II |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 3.53% |  |  |  |  |  |  |  |  |  |  |  |
Principal Balance Repaid |  |  |  | $ 5,545 |  |  |  |  |  |  |  |  |  |  |  |
Outlet Shoppes at Oklahoma City - Phase III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 3.53% |  |  |  |  |  |  |  |  |  |  |  |
Principal Balance Repaid |  |  |  | $ 2,704 |  |  |  |  |  |  |  |  |  |  |  |
Hanes Mall, Winston-Salem, NC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 6.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Balance Repaid | $ 144,325 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt | $ (371) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Outlet Shoppes At El Paso |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 7.06% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Balance Repaid | $ 61,561 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cool Springs Crossing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 4.54% |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  |  |  |  |  |  | $ 11,313 |  |  |  |  |
Gunbarrel Pointe |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 4.64% |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  |  |  |  |  |  | $ 10,083 |  |  |  |  |
Stroud Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 4.59% |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  |  |  |  |  |  | $ 30,276 |  |  |  |  |
York Galleria |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 4.55% |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  |  |  |  |  |  | $ 48,337 |  |  |  |  |
Hamilton Place |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 5.86% |  |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  |  |  |  |  | $ 98,181 |  |  |  |  |  |
Loan amount |  |  |  |  |  |  |  |  |  | $ 107,000 |  |  |  |  |  |
Stated Interest Rate |  |  |  |  |  |  |  |  |  | 4.36% |  |  |  |  |  |
Dakota Square Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 6.23% |  |  |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  |  |  |  | $ 55,103 |  |  |  |  |  |  |
Southaven Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 5.50% |  |  |  |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  |  |  | $ 38,314 |  |  |  |  |  |  |  |
Fashion Square | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage and other indebtedness, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,150
Stated Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.95%
Midland Mall | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 6.10% |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  | $ 3,760 |  |  |  |  |  |  |  |  |
Balance of Non-recourse Debt |  |  |  |  |  |  | $ 31,953 |  |  |  |  |  |  |  |  |
Chesterfield Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  | $ 20,420 |  |  |  |
Chesterfield Mall | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 5.74% |  |  |  |  |  |  |  |  | 5.74% |  |  |  |
Gain (loss) on extinguishment of debt |  |  | $ 29,187 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance of Non-recourse Debt |  |  | $ 140,000 |  |  |  |  |  |  |  |  | $ 140,000 |  |  |  |
Wausau Center | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  | $ 6,851 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance of Non-recourse Debt |  | $ 17,689 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chesterfield Mall, Midland Mall, and Wausau Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | 39,798 |  |  |
Balance of Non-recourse Debt |  |  |  |  |  |  |  |  |  |  |  |  | 189,642 |  |  |
Chesterfield Mall, Midland Mall, and Wausau Center | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage and other indebtedness, net |  |  |  |  |  |  |  |  |  |  |  |  | $ 122,435 |  |  |

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