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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures - Ground Leases (Details)
 1 Months Ended 3 Months Ended
Nov. 30, 2017
USD ($)
Mar. 31, 2018
USD ($)
item
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Variable Interest Entities        
Number of VIEs through ground leases | item   3    
Owner/operator supplemental mortgage $ 7,556,000      
Owner/operator original mortgage 43,824,000      
Fixed rent payment due to second mortgage $ 5,906,000      
Cash Reserves - ground lease   $ 429,000   $ 443,000
Accrued expenses and other liabilities        
Variable Interest Entities        
Fixed rent payment balance   5,816,000   $ 5,870,000
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   $ 158,210,000    
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   $ 51,355,000    
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 Apartment Lakemoor, Illinois; Briarbrook Village Apartment, Wheaton, Illinois; and Vue Apartment, Beachwood, Ohio        
Variable Interest Entities        
Revenue from the ground lease   $ 1,006,000 $ 888,000