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MORTGAGE AND OTHER INDEBTEDNESS, NET - Scheduled Principal Payments (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($)
Maturities of Long-term Debt [Abstract] |  |
2019 | $ 664,093,000 |
2020 | 640,330,000 |
2021 | 507,582,000 |
2022 | 432,638,000 |
2023 | 522,905,000 |
Thereafter | 1,182,824,000 |
Total | 3,950,372,000 |
Net unamortized discounts and premium | (10,989,000) |
Unamortized deferred financing costs | (15,963,000) | $ (18,938,000)
Mortgage and other indebtedness, net | 4,043,180,000 | 4,230,845,000
Liabilities related to assets held for sale | (43,716,000) | $ 0
Operating Property Loan |  |
Maturities of Long-term Debt [Abstract] |  |
2019 | $ 220,031,000 |
Number of operating property loans (loan) | loan | 6 |
Unsecured Term Loan |  |
Maturities of Long-term Debt [Abstract] |  |
2019 | $ 350,000,000 |
Number of debt instruments | loan | 1 |
Unsecured Term Loan |  |
Maturities of Long-term Debt [Abstract] |  |
Face value of debt instrument | $ 51,896,000 |
Principal Amortization |  |
Maturities of Long-term Debt [Abstract] |  |
2019 | 42,166,000 |
Mortgages | Operating Property Loan |  |
Maturities of Long-term Debt [Abstract] |  |
2019 | $ 68,101,000 |
Term of extension option | 1 year |
Mortgages | Operating Property Loan |  |
Maturities of Long-term Debt [Abstract] |  |
2019 | $ 54,550,000 |
Term of extension option | 2 years |
Mortgages | Remaining Loans |  |
Maturities of Long-term Debt [Abstract] |  |
2019 | $ 97,380,000 |
Chesterfield Mall, Midland Mall, and Wausau Center | Mortgages |  |
Maturities of Long-term Debt [Abstract] |  |
Mortgage and other indebtedness, net | $ 163,476,000 |

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