Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Real Estate - Properties Sold and Held for Sale (Details)
ft² in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 21, 2020
USD ($)
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Dec. 19, 2019
USD ($)
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Aug. 27, 2019
USD ($)
ft²
Aug. 21, 2019
USD ($)
ft²
Jul. 23, 2019
USD ($)
ft²
property
Jun. 26, 2019
USD ($)
ft²
Jun. 30, 2020
USD ($)
ft²
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
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Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
ft²
Properties Sold and Held for Sale [Line Items]                      
(Loss) gain on sale             $ (7,539) $ (1,046) $ (7,539) $ (1,046)  
Quantico Corporate Center | Office                      
Properties Sold and Held for Sale [Line Items]                      
Rentable Square Feet (sq ft) | ft²           272          
Contract Sales Price           $ 33,000          
(Loss) gain on sale           $ 1,000          
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)                
Held for sale | John Marshall II | Office                      
Properties Sold and Held for Sale [Line Items]                      
Contract sales price per agreement $ 57,000                   $ 63,400
2020 Properties                      
Properties Sold and Held for Sale [Line Items]                      
Rentable Square Feet (sq ft) | ft²             223   223    
Contract Sales Price             $ 57,000   $ 57,000    
(Loss) gain on sale                 $ (6,855)    
2020 Properties | Disposal group, not discontinued operations | John Marshall II | Office                      
Properties Sold and Held for Sale [Line Items]                      
Rentable Square Feet (sq ft) | ft² 223                    
Contract Sales Price $ 57,000                    
(Loss) gain on sale $ (6,855)                    
2019 Properties                      
Properties Sold and Held for Sale [Line Items]                      
Rentable Square Feet (sq ft) | ft²                     2,184
Contract Sales Price                     $ 728,750
(Loss) gain on sale                     $ 398,985
2019 Properties | Disposal group, not discontinued operations | Quantico Corporate Center | Office                      
Properties Sold and Held for Sale [Line Items]                      
Rentable Square Feet (sq ft) | ft²           272          
Contract Sales Price           $ 33,000          
(Loss) gain on sale           $ (1,046)          
2019 Properties | Disposal group, not discontinued operations | 1776 G Street | Office                      
Properties Sold and Held for Sale [Line Items]                      
Rentable Square Feet (sq ft) | ft²   262                  
Contract Sales Price   $ 129,500                  
(Loss) gain on sale   $ 61,007                  
2019 Properties | Discontinued operations | Shopping Center Portfolio | Retail                      
Properties Sold and Held for Sale [Line Items]                      
Rentable Square Feet (sq ft) | ft²         800            
Contract Sales Price         $ 485,250            
(Loss) gain on sale         $ 333,023            
Number of properties | property         5            
2019 Properties | Discontinued operations | Frederick Crossing and Frederick County Square | Retail                      
Properties Sold and Held for Sale [Line Items]                      
Rentable Square Feet (sq ft) | ft²       520              
Contract Sales Price       $ 57,500              
(Loss) gain on sale       $ 9,507              
2019 Properties | Discontinued operations | Centre at Hagerstown | Retail                      
Properties Sold and Held for Sale [Line Items]                      
Rentable Square Feet (sq ft) | ft²     330                
Contract Sales Price     $ 23,500                
(Loss) gain on sale     $ (3,506)