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FAIR VALUE MEASUREMENTS - Long-Lived Assets Measured at Fair Value (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 4 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2016 USD ($) office_building | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) mall | Dec. 31, 2017 USD ($) mall outparcel | Dec. 31, 2016 USD ($) property office_building mall outparcel store | Sep. 30, 2016 USD ($) | Mar. 31, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 71,285 | $ 174,529 | $ 71,401 | $ 116,822 |  |
Number of malls with impairment (mall) | mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 2 | 9 |  |
Fair Value |  |  |  |  |  |  |  |  |  | $ 91,841 |  |  |  | $ 46,200 |  |  |  |  | $ 91,841 | $ 81,350 | $ 46,200 |  |
Assets |  |  |  |  |  |  |  |  |  | 5,340,853 |  |  |  | 6,104,640 |  |  |  |  | 5,340,853 | $ 5,704,808 | $ 6,104,640 |  |
Number of stores with Impairment (outparcel) | outparcel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 3 |  |
Number of office buildings with impairment (office building) | office_building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Mortgage and other indebtedness, net |  |  |  |  |  |  |  |  |  | 4,043,180 |  |  |  |  |  |  |  |  | 4,043,180 | $ 4,230,845 |  |  |
Cary Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  | 2,693 | $ 51,983 |  |  |  |  |  |  |  |  |  |  |  |
Eastland Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  | 36,525 |  |  |  |  |  |  |  |  |  |  |  |  |
Honey Creek Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  | 48,640 |  |  |  |  |  |  |  |  |  |  |  |  |
Acadiana Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  | $ 43,007 |  |  |  |  |  |  |  |  |  |
Hickory Point Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  | $ 24,525 |  |  |  |  |  |  |  |  |  |  |
Outparcel Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash impairment of long-lived asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 854 |  |
Number of properties disposed of (property) | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Bonita Lakes Mall and Crossing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  | $ 5,323 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  | $ 0
Assets |  |  |  |  |  |  |  |  | 27,440 |  |  |  |  |  |  | 27,440 |  |  |  |  |  |  | $ 27,440
Concentration risk (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.70%
Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,910 |  |  |  |  |  |  | $ 27,910 |  |
Midland Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  | 4,681 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  | $ 29,200 |  |  |  |  |  |  | 29,200 |  |  |  |  |  |  | $ 29,200
Concentration risk (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.60% |  |
Estimated selling costs relative to total fair value (as a percent) |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
River Ridge Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  | $ 9,594 |  |  |  |  | 84 |  | 9,510 |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  | 0 |  |  |  |  |  |  | $ 0
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 0.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for future capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,100 |  |  |  |  |  |  |
The Lakes and Fashion Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  | $ 32,096 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,447 |  |  |  |  |  |  | $ 65,447 |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.60% |  |
Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,500 |  |  |  |  |  |  | $ 66,500 |  |
Wausau Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  | 10,738 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  | $ 11,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.30% |  |
Number of stores sold | store |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Estimated selling costs relative to total fair value (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |
Randolph Mall, Regency Mall, and Walnut Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  | $ 43,144 |  |  |  |  |  |  | (150) | $ 43,294 |  |  |  |  |  |  |  |
Number of malls with impairment (mall) | mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Fair Value |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  | $ 0 |
Assets |  |  |  |  |  |  | 31,318 |  |  |  |  |  |  |  | 31,318 |  |  |  |  |  |  | $ 31,318 |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |
Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,250 |  |  |  |  |  |  | $ 32,250 |  |
One and Two Oyster Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  | 3,844 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  | $ 6,000 |  |  |  |  |  |  |  | 6,000 |  |  |  |  |  |  | $ 6,000 |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.30% |  |
Number of office buildings with impairment (office building) | office_building |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated selling costs relative to total fair value (as a percent) |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oak Branch Business Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  | (22) | 122 |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 |
Cobblestone Village at Palm Coast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  | 6,448 |  |  |  |  |  |  | 150 | 6,298 |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  | $ 0 |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.10% |
Estimated selling costs relative to total fair value (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Non-Recourse Loans on Operating Properties | Wausau Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage and other indebtedness, net |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,689 |  |  |  |  |  |  | $ 17,689 |  |
Malls | Janesville Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  | $ 18,061 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in consolidated joint venture, fair value |  | $ 17,640 |  |  |  |  |  |  |  |  | 17,640 |  |  |  |  |  |  |  |  |  |  |  |
Malls | Cary Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  | 54,678 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value |  | $ 30,971 |  |  |  |  |  |  |  |  | $ 30,971 |  |  |  |  |  |  |  |  |  |  |  |
Malls | Acadania Mall - Macy's & Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,593 |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  | 3,920 |  |  |  |  |  |  |  |  | 3,920 |  |  |  |
Investment in consolidated joint venture, fair value |  |  |  |  |  |  |  |  |  | 3,920 |  |  |  |  |  |  |  |  | 3,920 |  |  |  |
Malls | Eastland Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,525 |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  | 26,450 |  |  |  |  |  |  |  |  | 26,450 |  |  |  |
Investment in consolidated joint venture, fair value |  |  |  |  |  |  |  |  |  | 26,450 |  |  |  |  |  |  |  |  | 26,450 |  |  |  |
Malls | Honey Creek Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,640 |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  | 16,400 |  |  |  |  |  |  |  |  | 16,400 |  |  |  |
Investment in consolidated joint venture, fair value |  |  |  |  |  |  |  |  |  | 16,400 |  |  |  |  |  |  |  |  | 16,400 |  |  |  |
Malls | Woodstock, GA - Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  | $ 3,147 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in consolidated joint venture, fair value |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Malls | Acadiana Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  | $ 43,007 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  | 67,300 |  |  |  |  |  |  |  | 67,300 |  |  |  |  |  |  |  |  |  |
Investment in consolidated joint venture, fair value |  |  |  |  | $ 67,300 |  |  |  |  |  |  |  | $ 67,300 |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.90% |  |  |
Malls | Hickory Point Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  | $ 24,525 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  | 14,050 |  |  |  |  |  |  |  | 14,050 |  |  |  |  | $ 14,050 | 14,050 |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |
Malls/ All Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 606 |  |  |  |  |  |
Fair Value |  |  |  | $ 0 |  |  |  |  |  |  |  | $ 0 |  |  |  |  | $ 0 | $ 0 |  |  |  |  |
Malls/ All Other | D'Ibervilee, MS - Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment | $ 14,598 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value | $ 8,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in consolidated joint venture, fair value |  |  |  |  |  |  |  |  |  | 8,100 |  |  |  |  |  |  |  |  | 8,100 |  |  |  |
Malls/ All Other | Pavilion at Port Orange - Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 434 |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  | $ 6,000 |  |  |  |  |  |  |  |  | $ 6,000 |  |  |  |
Retail Site |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 115,968 |  |
Outparcel Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 116 |  |  |
Number of stores sold | outparcel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Expected Term | Midland Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Holding period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Expected Term | Wausau Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Holding period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Expected Term | Minimum | One and Two Oyster Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Holding period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Expected Term | Maximum | One and Two Oyster Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Holding period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |
Expected Term | Malls | Cary Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Holding period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Expected Term | Malls | Eastland Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Holding period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Expected Term | Malls | Honey Creek Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Holding period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Expected Term | Malls | Acadiana Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Holding period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |
Expected Term | Malls | Hickory Point Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Holding period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |
Cap Rate | Midland Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  |  |  |  |  |  |  |  | 0.0975 |  |  |  |  |  |  | 0.0975 |  |  |  |  |  |  | 0.0975
Cap Rate | Wausau Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.1325 |  |  |  |  |  |  | 0.1325 |  |
Cap Rate | One and Two Oyster Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.080 |  |  |  |  |  |  | 0.080 |  |
Cap Rate | Cobblestone Village at Palm Coast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  |  |  |  |  |  | 0.090 |  |  |  |  |  |  |  | 0.090 |  |  |  |  |  |  | 0.090 |
Cap Rate | Malls | Cary Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  | 0.120 |  |  |  |  |  |  |  |  | 0.120 |  |  |  |  |  |  |  |  |  |  |  |
Cap Rate | Malls | Eastland Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  | 0.150 |  |  |  |  |  |  |  |  | 0.150 |  |  |  |  |  |  |  |  |  |  |  |
Cap Rate | Malls | Honey Creek Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  | 0.180 |  |  |  |  |  |  |  |  | 0.180 |  |  |  |  |  |  |  |  |  |  |  |
Cap Rate | Malls | Acadiana Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  |  |  |  | 0.155 |  |  |  |  |  |  |  | 0.155 |  |  |  |  |  |  |  |  |  |
Cap Rate | Malls | Hickory Point Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  |  |  | 0.180 |  |  |  |  |  |  |  | 0.180 |  |  |  |  | 0.180 | 0.180 |  |  |  |  |
Discount Rate | Midland Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  |  |  |  |  |  |  |  | 0.115 |  |  |  |  |  |  | 0.115 |  |  |  |  |  |  | 0.115
Discount Rate | Wausau Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.130 |  |  |  |  |  |  | 0.130 |  |
Discount Rate | One and Two Oyster Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.100 |  |  |  |  |  |  | 0.100 |  |
Discount Rate | Cobblestone Village at Palm Coast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  |  |  |  |  |  | 0.1075 |  |  |  |  |  |  |  | 0.1075 |  |  |  |  |  |  | 0.1075 |
Discount Rate | Malls | Cary Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  | 0.13 |  |  |  |  |  |  |  |  | 0.13 |  |  |  |  |  |  |  |  |  |  |  |
Discount Rate | Malls | Eastland Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  | 0.170 |  |  |  |  |  |  |  |  | 0.170 |  |  |  |  |  |  |  |  |  |  |  |
Discount Rate | Malls | Honey Creek Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  | 0.200 |  |  |  |  |  |  |  |  | 0.200 |  |  |  |  |  |  |  |  |  |  |  |
Discount Rate | Malls | Acadiana Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  |  |  |  | 0.1575 |  |  |  |  |  |  |  | 0.1575 |  |  |  |  |  |  |  |  |  |
Discount Rate | Malls | Hickory Point Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  |  |  | 0.190 |  |  |  |  |  |  |  | 0.190 |  |  |  |  | 0.190 | 0.190 |  |  |  |  |

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