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SUBSEQUENT EVENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Subsequent Event [Line Items]    
Encumbrances $ 1,908,027  
Mortgage and other indebtedness, net 4,230,845 $ 4,465,294
Kirkwood Mall, Bismarck, ND    
Subsequent Event [Line Items]    
Encumbrances 37,295  
Hammock Landing - Phase I and Phase II and The Pavilion at Port Orange | Secured Debt    
Subsequent Event [Line Items]    
Mortgage and other indebtedness, net $ 115,652