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ORGANIZATION AND BASIS OF PRESENTATION (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 USD ($) property | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) property | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Reallocation of noncontrolling interest | $ 38,800,000 |  | $ 0 |  | $ 31,800,000
Number of retail properties (in properties) | property | 168 |  | 168 |  |
Impairment of asset | $ 0 | $ 5,000,000 | $ 0 | $ 5,000,000 |
Brandywine Portfolio |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Noncontrolling interest, ownership percentage |  | 77.78% |  | 77.78% |
Impairment of asset |  | $ 5,000,000 |  |  |
Core Portfolio |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Number of retail properties (in properties) | property | 110 |  | 110 |  |
Impairment of asset |  | 5,000,000 |  | $ 5,000,000 |
Opportunity Funds |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Number of retail properties (in properties) | property | 58 |  | 58 |  |
Impairment of asset |  | 0 |  | $ 0 |
Operating Partnership | Brandywine Portfolio |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Impairment of asset |  | $ 1,100,000 |  |  |
Mortgages |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Debt instrument face amount | $ 21,384,000 |  | $ 21,384,000 |  |
Non-Recourse Mortgage Debt Due 2016 | Mortgages |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Debt instrument face amount | $ 26,300,000.0 |  | $ 26,300,000.0 |  |
Operating Partnership, as General Partner or Managing Member |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Ownership interest by general partner or managing partner |  |  | 94.00% |  |
Remaining funds rate of distribution to partnership | 20.00% |  | 20.00% |  |
Institutional Investors |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Remaining funds rate of distribution to all partners | 80.00% |  | 80.00% |  |

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