Quarterly report pursuant to Section 13 or 15(d)

Real Estate - Properties Sold and Held for Sale Narrative (Details)

v3.20.1
Real Estate - Properties Sold and Held for Sale Narrative (Details)
ft² in Thousands, $ in Thousands
1 Months Ended 3 Months Ended
Aug. 27, 2019
USD ($)
Aug. 21, 2019
USD ($)
Jul. 23, 2019
USD ($)
Jun. 26, 2019
USD ($)
ft²
buildings
Jun. 30, 2019
agreement
buyer
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Apr. 21, 2020
USD ($)
Dec. 31, 2019
USD ($)
Properties Sold and Held for Sale [Line Items]                    
Real estate impairment           $ 0   $ 8,374    
Loss on extinguishment of debt             $ 800      
Quantico Corporate Center | Office                    
Properties Sold and Held for Sale [Line Items]                    
Number of buildings | buildings       2            
Rentable square feet (sq ft) | ft²       272            
Contract sales price       $ 33,000            
(Loss) gain on sale       $ 1,000            
Real estate impairment               $ 8,400    
Shopping Center Portfolio and Power Center Portfolio                    
Properties Sold and Held for Sale [Line Items]                    
Number of purchase and sale agreements | agreement         2          
Number of buyers | buyer         2          
Shopping Center Portfolio                    
Properties Sold and Held for Sale [Line Items]                    
(Loss) gain on sale     $ 333,000              
Frederick Crossing and Frederick County Square                    
Properties Sold and Held for Sale [Line Items]                    
(Loss) gain on sale   $ 9,500                
Centre at Hagerstown                    
Properties Sold and Held for Sale [Line Items]                    
(Loss) gain on sale $ (3,500)                  
John Marshall II | Held for sale | Office                    
Properties Sold and Held for Sale [Line Items]                    
Contract sales price per agreement                   $ 63,400
John Marshall II | Held for sale | Office | Subsequent Event                    
Properties Sold and Held for Sale [Line Items]                    
Contract sales price per agreement                 $ 57,000