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Indebtedness - Additional Information (Details)
1 Months Ended 6 Months Ended
Jul. 13, 2017
USD ($)
Apr. 07, 2017
USD ($)
Feb. 01, 2017
USD ($)
Feb. 25, 2016
leverage_ratio_increase
Jul. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 29, 2017
USD ($)
Mar. 31, 2017
USD ($)
Feb. 24, 2017
USD ($)
Dec. 31, 2016
USD ($)
Feb. 20, 2015
USD ($)
Harrisonburg Regal                      
Indebtedness                      
Repayments of long-term debt   $ 3,200,000                  
Commonwealth Of Virginia | Chesapeake, Virginia | Subsequent Event                      
Indebtedness                      
Repayments of long-term debt $ 4,900,000                    
Note Payable Five | North Point Center                      
Indebtedness                      
Repayments of long-term debt     $ 600,000                
Construction Loans                      
Indebtedness                      
Borrowings under construction loans           $ 2,900,000          
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
Financial covenant, leverage ratio consecutive quarters following any significant acquisition       65.00%              
Financial covenant, number of consecutive quarters maintaining leverage ratio following any significant acquisition       6 months              
Financial covenant, investments to total asset value       10.00%              
Financial covenant, maximum number of times maximum leverage ratio can increase | leverage_ratio_increase       2              
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           2.53%          
Revolving credit facility, extension option           1 year          
Credit facility, amount outstanding           $ 28,000,000          
Operating Partnership | Unsecured Debt | New Credit Facility | Revolving Credit Facility | Subsequent Event                      
Indebtedness                      
Increase in borrowing         $ 30,000,000            
Operating Partnership | Unsecured Debt | New Credit Facility | Revolving Credit Facility | Minimum | LIBOR                      
Indebtedness                      
Stated interest rate, basis spread on variable rate           1.40%          
Operating Partnership | Unsecured Debt | New Credit Facility | Revolving Credit Facility | Maximum | LIBOR                      
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   $ 100,000,000.0 $ 50,000,000.0
Interest rate on credit facility as of end of period           2.48%          
Credit facility, amount outstanding           $ 125,000,000          
Operating Partnership | Unsecured Debt | New Credit Facility | Term Loan Facility | Minimum | LIBOR                      
Indebtedness                      
Stated interest rate, basis spread on variable rate           1.35%          
Operating Partnership | Unsecured Debt | New Credit Facility | Term Loan Facility | Maximum | LIBOR                      
Indebtedness                      
Stated interest rate, basis spread on variable rate           1.95%