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VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - Ground Leases (Details)
 1 Months Ended 12 Months Ended
Nov. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Variable Interest Entities        
Number of VIEs through ground leases | item   3    
Owner/operator closed supplemental mortgage $ 7,556,000      
Owner/operator closed original mortgage 43,824,000      
Fixed rent payment resulting from second mortgage $ 5,906,000      
Cash Reserves - ground lease   $ 443,000 $ 643,000  
The Meadows Apartments, Lakemoor, Illinois; Briarbrook Village Apartments, Wheaton, Illinois and Vue Apartments, Beachwood, Ohio        
Variable Interest Entities        
Land Contract Purchase Price   $ 33,726,000    
Units in Apartment Complex | item   1,186    
Owner/ Operator Mortgage from Third Party   $ 158,235,000    
Carrying Amount and Maximum Exposure to Loss   34,029,000    
The Meadows Apartments, Lakemoor, Illinois        
Variable Interest Entities        
Land Contract Purchase Price   $ 9,300,000    
Units in Apartment Complex | item   496    
Owner/ Operator Mortgage from Third Party   $ 51,380,000    
The Meadows Apartments, Lakemoor, Illinois | Land        
Variable Interest Entities        
Carrying Amount and Maximum Exposure to Loss   9,592,000    
The Briarbrook Village Apartments Wheaton, Illinois        
Variable Interest Entities        
Land Contract Purchase Price   $ 10,530,000    
Units in Apartment Complex | item   342    
Owner/ Operator Mortgage from Third Party   $ 39,411,000    
The Briarbrook Village Apartments Wheaton, Illinois | Land        
Variable Interest Entities        
Carrying Amount and Maximum Exposure to Loss   10,536,000    
The Vue Apartments, Beachwood, Ohio        
Variable Interest Entities        
Land Contract Purchase Price   $ 13,896,000    
Units in Apartment Complex | item   348    
Owner/ Operator Mortgage from Third Party   $ 67,444,000    
The Vue Apartments, Beachwood, Ohio | Land        
Variable Interest Entities        
Carrying Amount and Maximum Exposure to Loss   13,901,000    
The Meadows Apartments, Lakemoor, Illinois; Briarbrook Village Apartments, Wheaton, Illinois; Vue Apartments, Beachwood, Ohio and River Crossing Apartments, Sandy Springs, Georgia        
Variable Interest Entities        
Revenue from the ground lease   $ 3,702,000 2,361,000 $ 1,280,000
River Crossing Apartments, Sandy Springs, Georgia        
Variable Interest Entities        
Revenue from the ground lease     $ 308,000 $ 419,000