Quarterly report pursuant to Section 13 or 15(d)

Borrowings - Summary of Borrowings (Details)

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Borrowings - Summary of Borrowings (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total borrowings, net $ 293,424 $ 301,002
Mortgage notes and bonds payable    
Debt Instrument [Line Items]    
Total mortgage notes and bonds payable 291,944 292,988
Debt issuance costs – mortgage notes and bonds payable (2,020) (1,986)
Total borrowings, net 289,924 291,002
Notes payable to bank | Fixed-rate mortgage notes payable    
Debt Instrument [Line Items]    
Total mortgage notes and bonds payable $ 206,393 208,469
Notes payable to bank | Fixed-rate mortgage notes payable | Minimum    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 3.16%  
Notes payable to bank | Fixed-rate mortgage notes payable | Maximum    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 4.99%  
Notes payable to bank | Fixed-rate mortgage notes payable | Weighted average    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 3.63%  
Bonds payable | Fixed-rate bonds payable    
Debt Instrument [Line Items]    
Total mortgage notes and bonds payable $ 85,551 84,519
Bonds payable | Fixed-rate bonds payable | Minimum    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 2.38%  
Bonds payable | Fixed-rate bonds payable | Maximum    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 4.47%  
Bonds payable | Fixed-rate bonds payable | Weighted average    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 3.15%  
MetLife Lines of Credit | Variable-rate revolving lines of credit | Revolving credit facility    
Debt Instrument [Line Items]    
Total borrowings, net $ 3,500 $ 10,000
Stated interest rate (as percent) 4.57%