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Indebtedness - Additional Information (Details) - USD ($)
1 Months Ended 9 Months Ended
Oct. 13, 2017
Aug. 10, 2017
Jul. 13, 2017
Apr. 07, 2017
Feb. 01, 2017
Oct. 31, 2017
Sep. 30, 2017
Oct. 26, 2017
Sep. 01, 2017
Aug. 09, 2017
Jun. 29, 2017
Mar. 31, 2017
Feb. 24, 2017
Dec. 31, 2016
Feb. 20, 2015
Harrisonburg Regal                              
Indebtedness                              
Repayments of long-term debt       $ 3,200,000                      
Commonwealth Of Virginia | Chesapeake, Virginia                              
Indebtedness                              
Repayments of long-term debt     $ 4,900,000                        
Hanbury Village                              
Indebtedness                              
Stated interest rate                   3.78%          
Sandbridge Commons                              
Indebtedness                              
Repayments of long-term debt   $ 700,000                          
The Cosmopolitan                              
Indebtedness                              
Stated interest rate                 3.35%         3.75%  
Subsequent Event | Liberty Apartments                              
Indebtedness                              
Repayments of long-term debt $ 5,000,000                            
Note Payable Five | North Point Center                              
Indebtedness                              
Repayments of long-term debt         $ 600,000                    
Construction Loans                              
Indebtedness                              
Borrowings under construction loans             $ 3,600,000                
Construction Loans | Harding Place                              
Indebtedness                              
Construction loan                         $ 29,800,000.0    
Construction Loans | Town Center Phase VI | Virginia Beach, Virginia                              
Indebtedness                              
Construction loan                     $ 27,900,000.0        
Operating Partnership | Unsecured Debt | New Credit Facility                              
Indebtedness                              
Aggregate capacity under the credit facility                       $ 275,000,000.0     $ 200,000,000.0
Operating Partnership | Unsecured Debt | New Credit Facility | Subsequent Event                              
Indebtedness                              
Aggregate capacity under the credit facility               $ 300,000,000              
Operating Partnership | Unsecured Debt | New Credit Facility | Revolving Credit Facility                              
Indebtedness                              
Aggregate capacity under the credit facility                             150,000,000.0
Interest rate on credit facility as of end of period             2.78%                
Revolving credit facility, extension option             1 year                
Credit facility, amount outstanding             $ 58,000,000                
Operating Partnership | Unsecured Debt | New Credit Facility | Revolving Credit Facility | Subsequent Event                              
Indebtedness                              
Increase in borrowing           $ 8,000,000                  
Operating Partnership | Unsecured Debt | New Credit Facility | Revolving Credit Facility | LIBOR | Minimum                              
Indebtedness                              
Stated interest rate, basis spread on variable rate             1.40%                
Operating Partnership | Unsecured Debt | New Credit Facility | Revolving Credit Facility | LIBOR | Maximum                              
Indebtedness                              
Stated interest rate, basis spread on variable rate             2.00%                
Operating Partnership | Unsecured Debt | New Credit Facility | Term Loan Facility                              
Indebtedness                              
Aggregate capacity under the credit facility                       $ 125,000,000   $ 100,000,000 $ 50,000,000.0
Interest rate on credit facility as of end of period             2.74%                
Credit facility, amount outstanding             $ 125,000,000                
Operating Partnership | Unsecured Debt | New Credit Facility | Term Loan Facility | Subsequent Event                              
Indebtedness                              
Aggregate capacity under the credit facility               $ 150,000,000              
Increase in borrowing           $ 25,000,000                  
Operating Partnership | Unsecured Debt | New Credit Facility | Term Loan Facility | LIBOR | Minimum                              
Indebtedness                              
Stated interest rate, basis spread on variable rate             1.35%                
Operating Partnership | Unsecured Debt | New Credit Facility | Term Loan Facility | LIBOR | Maximum                              
Indebtedness                              
Stated interest rate, basis spread on variable rate             1.95%