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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures - Ground Leases (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
item
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
item
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Variable Interest Entities          
Number of VIEs | item 3   3    
Restricted cash - ground lease $ 527,000   $ 527,000   $ 643,000
The Meadows Apartments, Lakemoor, Illinois; Briarbrook Village Apartments, Wheaton, Illinois and Vue Apartments, Beachwood, Ohio          
Variable Interest Entities          
Contract Purchase Price of Land     $ 33,726,000    
Units in Apartment Complex | item     1,186    
Owner/ Operator Mortgage from Third Party     $ 150,679,000    
Carrying Amount and Maximum Exposure to Loss 34,029,000   34,029,000    
The Meadows Apartments, Lakemoor, Illinois          
Variable Interest Entities          
Contract Purchase Price of Land     $ 9,300,000    
Units in Apartment Complex | item     496    
Owner/ Operator Mortgage from Third Party     $ 43,824,000    
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          
Contract Purchase Price of Land     $ 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          
Contract Purchase Price of Land     $ 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 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 $ 917,000 $ 434,000 $ 1,804,000 $ 862,000  
River Crossing Apartments, Sandy Springs, Georgia          
Variable Interest Entities          
Revenue from the ground lease   $ 157,000   $ 308,000