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Commitments and Contingencies (Details)
3 Months Ended 6 Months Ended
Apr. 12, 2017
USD ($)
Jun. 30, 2017
USD ($)
lease
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
lease
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]            
Number of properties subject to ground leases | lease   1   1    
Ground lease expense   $ 0 $ 107,000 $ 67,000 $ 176,000  
Office space, rent expense   316,000 $ 318,000 671,000 $ 693,000  
Compensatory Damages [Member]            
Loss Contingencies [Line Items]            
Damages awarded in jury verdict $ 6,000,000          
Punitive Damages [Member]            
Loss Contingencies [Line Items]            
Damages awarded in jury verdict 6,000,000          
Legacy Corner Apartments Litigation [Member]            
Loss Contingencies [Line Items]            
Loss contingency accrual   3,000,000   3,000,000   $ 0
Potential loss contingency exposure $ 6,000,000          
Litigation settlement paid by insurance carrier   1,000,000   1,000,000    
Other Liabilities [Member] | Legacy Corner Apartments Litigation [Member]            
Loss Contingencies [Line Items]            
Loss contingency accrual   8,000,000   8,000,000    
Deferred Costs and Other Assets [Member] | Legacy Corner Apartments Litigation [Member]            
Loss Contingencies [Line Items]            
Insurance receivable   $ 5,000,000   $ 5,000,000