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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
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