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ORGANIZATION - Properties Owned by Operating Partnership (Details)
Dec. 31, 2018
property
associated_center
mixed_use_center
office_building
mall
community_center
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 67
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 7
Number of office buildings in which interest is owned by the partnership (office building) 6
Number of real estate properties (property) | property 103
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 59
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 2
Number of office buildings in which interest is owned by the partnership (office building) 5
Number of real estate properties (property) | property 86
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 5
Number of office buildings in which interest is owned by the partnership (office building) 1
Number of real estate properties (property) | property 17