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MORTGAGE AND OTHER INDEBTEDNESS, NET (Scheduled Principal Payments) (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($)
Maturities of Long-term Debt [Abstract] |  |  |
2018 |  | $ 667,720,000 |
2019 |  | 361,411,000 |
2020 |  | 544,957,000 |
2021 |  | 498,168,000 |
2022 |  | 431,331,000 |
Thereafter |  | 1,635,792,000 |
Total |  | 4,139,379,000 |
Net unamortized discounts and premium |  | (12,031,000) |
Unamortized deferred financing costs |  | (18,938,000) | $ (17,855,000)
Mortgage and other indebtedness, net |  | 4,230,845,000 | 4,465,294,000
Operating Property Loan |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
2018 |  | $ 82,190,000 |
Number of operating property loans (loan) | loan |  | 4 |
Unsecured Term Loan |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
2018 |  | $ 540,000,000 |
Number of debt instruments (loan) | loan |  | 2 |
Extension option, term |  | 1 year |
Unsecured Term Loan 2 |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
2018 |  | $ 350,000,000 |
Debt instrument, face value |  | $ 350,000,000 | 50,000,000
Extension option, term |  | 1 year |
Other |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
2018 |  | $ 190,000,000 |
Debt instrument, face value | $ 490,000,000 |  | $ 400,000,000
Extension option, term | 1 year |  |
Principal Amortization |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
2018 |  | 45,530,000 |
Mortgages | Operating Property Loan |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
2018 |  | $ 27,446,000 |
Extension option, term |  | 1 year |
Mortgages | Remaining Loans |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
2018 |  | $ 244,744,000 |
Chesterfield Mall, Midland Mall, and Wausau Center | Mortgages |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
Mortgage and other indebtedness, net |  | $ 122,435,000 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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