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MORTGAGE AND OTHER INDEBTEDNESS, NET - Fixed Rate Debt (Details) - USD ($) $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Aug. 31, 2018 | Sep. 30, 2017 | Aug. 31, 2017 | Jun. 30, 2017 | Apr. 30, 2017 | Mar. 31, 2017 | Feb. 28, 2017 | Jan. 31, 2017 | Sep. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 04, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount Financed or Extended |  |  |  |  |  |  |  |  |  | $ 102,446 |  | $ 0 | $ 1,802 | $ 0 |
Principal Balance Repaid |  |  |  |  |  |  |  |  |  |  |  | $ 17,278 | 427,247 |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | 30,927 |  |
Fixed Rate Operating Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average remaining term to maturity |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Non-Recourse Loans on Operating Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value of debt instrument |  |  |  |  |  |  |  |  |  |  |  | $ 43,716 |  |  | $ 43,716
Hickory Point Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 5.85% |  |  |  |  |  |  |  |  |  |  |  |  |
Amount Financed or Extended |  | $ 27,446 |  |  |  |  |  |  |  |  |  |  |  |  |
The Outlet Shoppes At El Paso |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 5.10% |  |  |  |  |  |  |  |  | 5.10% |  |  |  |  |
Amount Financed or Extended | $ 75,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 7.06% |  |  |  |  |  |  |  |  |  |  |  |
Principal Balance Repaid |  |  | $ 61,561 |  |  |  |  |  |  |  |  |  |  |  |
Kirkwood Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 5.75% |  |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  |  |  |  | $ 37,295 |  |  |  |  |  |
The Plaza at Fayette, Lexington, KY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 5.67% |  |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  |  |  |  | $ 37,146 |  |  |  |  |  |
The Shoppes at St. Clair Square, Fairview Heights, IL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 5.67% |  |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  |  |  |  | $ 18,827 |  |  |  |  |  |
Hamilton Corner, Chattanooga, TN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 5.67% |  |  |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  |  |  | $ 14,227 |  |  |  |  |  |  |
Layton Hills Mall, Layton, UT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 5.66% |  |  |  |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  |  | $ 89,526 |  |  |  |  |  |  |  |
The Outlet Shoppes at Oklahoma City, Oklahoma City, OK |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 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 (as a percent) |  |  |  |  |  | 3.53% |  |  |  |  |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  | $ 5,545 |  |  |  |  |  |  |  |  |
Outlet Shoppes at Oklahoma City - Phase III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 3.53% |  |  |  |  |  |  |  |  |
Principal Balance Repaid |  |  |  |  |  | $ 2,704 |  |  |  |  |  |  |  |  |
Hanes Mall, Winston-Salem, NC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 6.99% |  |  |  |  |  |  |  |  |  |  |  |
Principal Balance Repaid |  |  | $ 144,325 |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  | $ (371) |  |  |  |  |  |  |  |  |  |  |  |
Midland Mall | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 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 (as a percent) |  |  |  |  | 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 (as a percent) |  |  |  | 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 |  |
Outlet Shoppes at Atlanta - Ridgewalk | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance of Non-recourse Debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,466 |  |
Minimum | Fixed Rate Operating Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of debt bearing fixed interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |
Maximum | Fixed Rate Operating Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of debt bearing fixed interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |

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