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ORGANIZATION (Schedule of Properties Owned by Operating Partnership) (Details) | Dec. 31, 2017 property associated_center mall community_center mixed_use_center office_building | Dec. 31, 2015 property
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Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Number of regional malls/open-air centers in which interest is owned by the partnership (mall) | mall | 68 |
Number of associated centers in which interest is owned by the partnership (associated center) | associated_center | 23 |
Number of community centers in which interest is owned by the partnership (community center) | community_center | 9 |
Number of office buildings in which interest is owned by the partnership (office building) | 5 |
Number of real estate properties (property) | property | 105 | 4
Parent |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Number of regional malls/open-air centers in which interest is owned by the partnership (mall) | mall | 60 |
Number of associated centers in which interest is owned by the partnership (associated center) | associated_center | 20 |
Number of community centers in which interest is owned by the partnership (community center) | community_center | 5 |
Number of office buildings in which interest is owned by the partnership (office building) | 5 |
Number of real estate properties (property) | property | 90 |
Number of mixed-use centers owned (mixed use center) | mixed_use_center | 1 |
Parent | Subsidiaries |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Number of office buildings in which interest is owned by the partnership (office building) | 2 |
Noncontrolling Interests |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |
Number of regional malls/open-air centers in which interest is owned by the partnership (mall) | mall | 8 |
Number of associated centers in which interest is owned by the partnership (associated center) | associated_center | 3 |
Number of community centers in which interest is owned by the partnership (community center) | community_center | 4 |
Number of office buildings in which interest is owned by the partnership (office building) | 0 |
Number of real estate properties (property) | property | 15 |

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- Definition The number of community center properties in which interest is owned as of the balance sheet date + References No definition available. + Details
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- Definition Number of regional malls/open air centers in which interest is owned as of the balance sheet date. + References No definition available. + Details
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