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, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total borrowings, net $ 271,991 $ 207,347
Mortgage notes and bonds payable    
Debt Instrument [Line Items]    
Total mortgage notes and bonds payable 238,642 192,209
Deferred financing costs – mortgage notes and bonds payable (1,701) (1,412)
Total borrowings, net 236,941 190,797
Notes payable to bank | Fixed-rate mortgage notes payable    
Debt Instrument [Line Items]    
Total mortgage notes and bonds payable $ 157,121 142,861
Notes payable to bank | Fixed-rate mortgage notes payable | Minimum    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 2.90%  
Notes payable to bank | Fixed-rate mortgage notes payable | Maximum    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 4.41%  
Notes payable to bank | Fixed-rate mortgage notes payable | Weighted average    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 3.32%  
Bonds payable | Fixed-rate bonds payable    
Debt Instrument [Line Items]    
Total mortgage notes and bonds payable $ 81,521 49,348
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) 3.63%  
Bonds payable | Fixed-rate bonds payable | Weighted average    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 3.10%  
MetLife Lines of Credit | Variable-rate revolving lines of credit    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 3.26%  
MetLife Lines of Credit | Variable-rate revolving lines of credit | Revolving credit facility    
Debt Instrument [Line Items]    
Total borrowings, net $ 35,050 $ 16,550
Stated interest rate (as percent) 3.40%