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
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total borrowings, net $ 316,242 $ 301,002
Mortgage notes and bonds payable    
Debt Instrument [Line Items]    
Total mortgage notes and bonds payable 318,406 292,988
Debt issuance costs – mortgage notes and bonds payable (2,264) (1,986)
Total borrowings, net 316,142 291,002
Notes payable to bank | Fixed-rate mortgage notes payable    
Debt Instrument [Line Items]    
Total mortgage notes and bonds payable $ 227,529 208,469
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) 5.38%  
Notes payable to bank | Fixed-rate mortgage notes payable | Weighted average    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 3.81%  
Bonds payable | Fixed-rate bonds payable    
Debt Instrument [Line Items]    
Total mortgage notes and bonds payable $ 90,877 84,519
Bonds payable | Fixed-rate bonds payable | Minimum    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 2.80%  
Bonds payable | Fixed-rate bonds payable | Maximum    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 4.57%  
Bonds payable | Fixed-rate bonds payable | Weighted average    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 3.55%  
Line of credit | Variable-rate revolving lines of credit | Revolving credit facility    
Debt Instrument [Line Items]    
Total borrowings, net $ 100 $ 10,000
Stated interest rate (as percent) 4.59%