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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures - Ground Leases (Details)
 3 Months Ended
Mar. 31, 2019
USD ($)
item
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Variable Interest Entities      
Revenues $ 21,155,000 $ 19,534,000  
VIE ground leases and aggregate carrying amount and maximum exposure to loss      
Restricted cash $ 337,000 429,000 $ 1,106,000
Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entities      
Number of affiliated owner/operators | item 2    
Variable Interest Entity, Not Primary Beneficiary | The Briarbrook Village Apartments, Wheaton, Illinois and Vue Apartments, Beachwood, Ohio      
VIE ground leases and aggregate carrying amount and maximum exposure to loss      
Land Contract Purchase Price $ 24,426,000    
Units in Apartment Complex | item 690    
Owner/ Operator Mortgage from Third Party $ 106,855,000    
Carrying Amount and Maximum Exposure to Loss 24,437,000    
Variable Interest Entity, Not Primary Beneficiary | The Briarbrook Village Apartments, Wheaton, Illinois      
VIE ground leases and aggregate carrying amount and maximum exposure to loss      
Land Contract Purchase Price $ 10,530,000    
Units in Apartment Complex | item 342    
Owner/ Operator Mortgage from Third Party $ 39,411,000    
Restricted cash 337,000   356,000
Variable Interest Entity, Not Primary Beneficiary | The Briarbrook Village Apartments, Wheaton, Illinois | Land      
VIE ground leases and aggregate carrying amount and maximum exposure to loss      
Carrying Amount and Maximum Exposure to Loss 10,536,000    
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio      
VIE ground leases and aggregate carrying amount and maximum exposure to loss      
Land Contract Purchase Price $ 13,896,000    
Units in Apartment Complex | item 348    
Owner/ Operator Mortgage from Third Party $ 67,444,000    
Escrow deposit     $ 750,000
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio | Land      
VIE ground leases and aggregate carrying amount and maximum exposure to loss      
Carrying Amount and Maximum Exposure to Loss 13,901,000    
Variable Interest Entity, Not Primary Beneficiary | Rental income, net      
Variable Interest Entities      
Revenues $ 486,000 1,006,000  
Variable Interest Entity, Not Primary Beneficiary | Rental income, net | Property in Lakemoor, Illinois      
Variable Interest Entities      
Revenues   $ 325,000