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DISPOSITIONS AND HELD FOR SALE - Summary (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jun. 30, 2019 USD ($) | Apr. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Apr. 30, 2017 USD ($) loan | Mar. 31, 2019 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2019 USD ($) outparcel joint_venture | Dec. 31, 2018 USD ($) outparcel | Dec. 31, 2017 USD ($) outparcel
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | $ 120,308,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 118,383,000 |  |
Gain/(Loss) |  |  |  |  | $ 7,471,000 |  | $ 75,980,000 |  |  |  |  | 8,246,000 |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  | 239,521,000 | $ 174,529,000 | $ 71,401,000
Gain (loss) on sales of real estate assets |  |  |  |  |  |  |  |  |  |  |  | $ 16,274,000 | 19,001,000 | 93,792,000
Number of joint venture | joint_venture |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Gain (loss) on sale of outparcels |  |  |  |  |  |  |  |  |  |  |  | $ 33,000 |  |
Proceeds from sale of real estate |  |  |  |  | 53,402,000 |  | 112,076,000 |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  | 65,000,000 |  | 189,750,000 |  |  |  |  |  |  |
Held for sale | [1] |  |  |  | $ 30,971,000 |  |  |  |  |  |  |  | $ 30,971,000 |
Real Estate Held-for-sale, Percentage of Total Assets |  |  |  |  | 0.60% |  |  |  |  |  |  |  | 0.60% |
Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |
Non-recourse loans on operating properties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance of Non-recourse Debt |  |  |  |  | $ 43,716,000 |  |  |  |  |  |  |  | $ 43,716,000 |
Outparcel Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate assets |  |  |  |  |  |  |  |  |  |  |  | $ 6,434,000 | $ 11,530,000 | $ 17,812,000
Number of stores sold (outparcel) | outparcel |  |  |  |  |  |  |  |  |  |  |  | 5 | 12 | 12
Parkdale Self Storage L L C |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) related to land contributed |  |  |  |  |  |  |  |  |  |  |  | $ 1,627,000 |  |
Janesville Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  | $ 8,582,000 | $ (239,000) | $ 2,284,000 |  | $ 18,061,000 |  |  |  |  |  |  |  |
Acadania Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,593,000 | $ 43,007,000
Non-cash default interest expense |  |  |  |  |  |  |  |  | $ 305,000 |  |  |  |  |
Proceeds from sale of real estate |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |
Cary Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  | $ 54,678,000 |
Non-cash default interest expense |  |  |  |  |  |  |  |  | 237,000 |  |  |  |  |
Proceeds from sale of real estate |  |  |  |  |  |  |  |  | $ 31,500,000 |  |  |  |  |
Gulf Coast Town Center Phase I I I |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  | 2,236,000 |  |  |  |  |  |  |  |  |
Proceeds from sale of real estate |  |  |  |  | 8,769,000 |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  | 9,000,000 |  |  |  |  |  |  |  |  |
Statesboro Crossing | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
Statesboro Crossing | Consolidated Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
Outlet Shoppes At Oklahoma City |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Priority received |  |  |  |  |  |  |  | $ 7,477,000 |  |  |  |  |  |
Number of loans retired (loan) | loan |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Outlet Shoppes At Oklahoma City | Consolidated Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) |  |  |  |  |  |  |  | $ 48,800,000 |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |
Malls | College Square Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) |  |  |  |  |  |  |  |  |  | $ (1,448,000) | $ 1,994,000 |  |  |
Malls | Cary Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 31,500,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 31,068,000 |  |
Malls | Honey Creek Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 14,600,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 14,360,000 |  |
Malls | Shopsat Hickory Point |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 2,508,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 2,407,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 1,326,000 |  |
Malls | Janesville Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of real estate |  |  |  |  | 17,783,000 |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  | 18,000,000 |  |  |  |  |  |  |  |  |
Malls | College Square Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  | 742,000 |  |  |  |  |  |  |  |  |
Malls | Outlet Shoppes At Oklahoma City |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  |  |  | 75,434,000 |  |  |  |  |  |  |
Proceeds from sale of real estate |  |  |  |  |  |  | 55,368,000 |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  | 130,000,000 |  |  |  |  |  |  |
Malls | College Square Malland Foothills Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  |  |  | 546,000 |  |  |  |  |  |  |
Proceeds from sale of real estate |  |  |  |  |  |  | 50,566,000 |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  | 53,500,000 |  |  |  |  |  |  |
All Other | Courtyardby Marriottat Pearland Town Center |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 15,100,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 14,795,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 1,910,000 |  |
All Other | A850 Greenbriar Circle |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 10,500,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 10,332,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 96,000 |  |
All Other | Krogerat Foothill Plaza |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 2,350,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 2,267,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 1,139,000 |  |
All Other | The Forumat Grandview |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 31,750,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 31,606,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 47,000 |  |
All Other | Barnes Nobleat High Point |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 1,899,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 821,000 |  |
All Other | Dicks Sporting Goodsat Hanes Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 9,649,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | $ 2,907,000 |  |
All Other | Statesboro Crossing |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  | 3,215,000 |  |  |  |  |  |  |  |  |
Proceeds from sale of real estate |  |  |  |  | 10,532,000 |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  | 21,500,000 |  |  |  |  |  |  |  |  |
All Other | Parkway Plaza |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  | 1,419,000 |  |  |  |  |  |  |  |  |
Proceeds from sale of real estate |  |  |  |  | 16,318,000 |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  | 16,500,000 |  |  |  |  |  |  |  |  |
All Other | Oneand Two Oyster Point |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of real estate |  |  |  |  |  |  | 6,142,000 |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  | $ 6,250,000 |  |  |  |  |  |  |
Malls And All Other | Prior Sales Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) |  |  |  |  | $ (141,000) |  |  |  |  |  |  |  |  |
[1] | As of December 31, 2019, includes $ 370,629 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $ 177,506 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 10 .

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