Annual report pursuant to Section 13 and 15(d)

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

v3.19.3.a.u2
Real Estate - Properties Sold and Held for Sale Narrative (Details)
ft² in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 19, 2019
USD ($)
ft²
Aug. 27, 2019
USD ($)
Aug. 21, 2019
USD ($)
Jul. 23, 2019
USD ($)
Jun. 26, 2019
USD ($)
ft²
Jun. 28, 2018
USD ($)
ft²
Jan. 19, 2018
USD ($)
ft²
Oct. 23, 2017
USD ($)
apartment
Jun. 30, 2019
agreement
buyer
Dec. 31, 2019
USD ($)
ft²
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
ft²
buildings
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
ft²
Dec. 31, 2019
USD ($)
ft²
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
apartment
Apr. 22, 2019
USD ($)
Real Estate [Line Items]                                      
(Loss) gain on sale                   $ 61,000   $ (1,000)   $ 2,500   $ 59,961 $ 2,495 $ 24,915  
Impairment of real estate                         $ 8,400   $ 1,900 8,374 1,886 33,152  
(Loss) gain on sale                     $ 339,000         339,024 0 0  
Loss on extinguishment of debt                               $ 764 $ 0 0  
2019 Properties                                      
Real Estate [Line Items]                                      
Area of property (sq ft) | ft²                   2,407           2,407      
Contract sales price                   $ 792,100           $ 792,100      
2019 Properties | Disposal group, not discontinued operations                                      
Real Estate [Line Items]                                      
Loss on extinguishment of debt                     $ 800                
2018 Properties                                      
Real Estate [Line Items]                                      
Area of property (sq ft) | ft²                                 648    
Contract sales price                                 $ 194,600    
(Loss) gain on sale                                 2,495    
2018 Properties | Disposal group, not discontinued operations                                      
Real Estate [Line Items]                                      
(Loss) gain on sale                                 $ 2,495    
2017 Properties                                      
Real Estate [Line Items]                                      
Contract sales price                                   32,200  
(Loss) gain on sale                                   23,838  
2017 Properties | Disposal group, not discontinued operations                                      
Real Estate [Line Items]                                      
(Loss) gain on sale                                   23,838  
Quantico Corporate Center | Office | 2019 Properties | Disposal group, not discontinued operations                                      
Real Estate [Line Items]                                      
Number of buildings | buildings                         2            
Area of property (sq ft) | ft²         272               272            
Contract sales price         $ 33,000                           $ 33,000
(Loss) gain on sale         $ (1,046)                            
Impairment of real estate                         $ 8,400            
Shopping Center Portfolio and Power Center Portfolio                                      
Real Estate [Line Items]                                      
Number of purchase and sale agreements | agreement                 2                    
Number of buyers | buyer                 2                    
Shopping Center Portfolio | 2019 Properties | Disposal group, not discontinued operations                                      
Real Estate [Line Items]                                      
(Loss) gain on sale       $ 333,000                              
Frederick Crossing and Frederick County Square | 2019 Properties | Disposal group, not discontinued operations                                      
Real Estate [Line Items]                                      
(Loss) gain on sale     $ 9,500                                
Centre at Hagerstown | 2019 Properties | Disposal group, not discontinued operations                                      
Real Estate [Line Items]                                      
(Loss) gain on sale   $ 3,500                                  
1776 G Street | Office | 2019 Properties | Disposal group, not discontinued operations                                      
Real Estate [Line Items]                                      
Area of property (sq ft) | ft² 262                                    
Contract sales price $ 129,500                                    
(Loss) gain on sale $ 61,007                                    
John Marshall II | Office | 2019 Properties | Held for sale                                      
Real Estate [Line Items]                                      
Area of property (sq ft) | ft²                   223           223      
Contract sales price                   $ 63,350           $ 63,350      
Braddock Metro Center | Office | 2018 Properties | Disposal group, not discontinued operations                                      
Real Estate [Line Items]                                      
Area of property (sq ft) | ft²             356                        
Contract sales price             $ 93,000                        
(Loss) gain on sale             $ 0                        
Impairment of real estate                                   9,100  
2445 M Street | Office | 2018 Properties | Disposal group, not discontinued operations                                      
Real Estate [Line Items]                                      
Area of property (sq ft) | ft²           292                 292        
Contract sales price           $ 101,600               $ 101,600 $ 100,000        
(Loss) gain on sale           $ 2,495                          
Impairment of real estate                             $ 1,900     24,100  
Walker House Apartments | Multifamily | 2017 Properties | Disposal group, not discontinued operations                                      
Real Estate [Line Items]                                      
Contract sales price               $ 32,200                   32,200  
(Loss) gain on sale               $ 23,838                   $ 23,800  
Number of units | apartment               212                   212