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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures - Ground Leases (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
item
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
item
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Variable Interest Entities            
Number of VIEs through ground leases | item   3   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   $ 416,000   $ 416,000   $ 443,000
Accrued expenses and other liabilities            
Variable Interest Entities            
Fixed rent payment balance   5,762,000   5,762,000   $ 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       $ 158,186,000    
Carrying Amount and Maximum Exposure to Loss   34,029,000   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       $ 51,331,000    
The Meadows Apartments, Lakemoor, Illinois | Land            
Variable Interest Entities            
Carrying Amount and Maximum Exposure to Loss   9,592,000   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   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   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   $ 941,000 $ 917,000 $ 1,947,000 $ 1,804,000