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Real Estate Transactions - Narrative (Details)
$ in Thousands
1 Months Ended 9 Months Ended
May 09, 2018
shares
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
May 31, 2018
USD ($)
a
shares
Aug. 31, 2016
a
Sep. 30, 2019
USD ($)
property
Sep. 30, 2018
USD ($)
Sep. 01, 2019
tenant
Real Estate [Line Items]                
Deferred leasing costs, net   $ 28,083       $ 24,947    
Accumulated amortization deferred leasing cost   37,700       40,400    
Amortization expense deferred leasing cost           4,500 $ 4,300  
Depreciation expense           30,700 29,700  
Repairs and maintenance expense           9,700 8,700  
Payments to acquire real estate           13,398 6,586  
Construction in progress   185,972       317,798    
Real estate investments   1,948,165       $ 2,052,369    
Shopping Centers                
Real Estate [Line Items]                
Number of real estate properties | property           49    
Mixed-Use Properties                
Real Estate [Line Items]                
Number of real estate properties | property           6    
Non-operating Development Properties                
Real Estate [Line Items]                
Number of real estate properties | property           5    
Ashbrook Marketplace                
Real Estate [Line Items]                
Area of real estate acquired (in acres) | a       13.7        
Additions to real estate investments, noncash       $ 8,800     8,776  
Acquisition costs       $ 200        
Construction in progress   11,124       $ 22,570    
7316 Wisconsin Avenue                
Real Estate [Line Items]                
Payments to acquire real estate     $ 35,500          
Number of tenants | tenant               2
Construction in progress   0       $ 42,626    
Property acquisition costs     $ 700       $ 700  
Parcel Adjacent To 7316 Wisconsin Avenue                
Real Estate [Line Items]                
Payments to acquire real estate   4,500            
2018 Acquisitions                
Real Estate [Line Items]                
Real estate investments   $ 49,500            
BF Saul Real Estate Investment Trust | Ashbrook Marketplace                
Real Estate [Line Items]                
Limited partnership units issued for purchase (in shares) | shares 176,680     176,680        
Area of real estate acquired (in acres) | a         13.7      
Building | Minimum                
Real Estate [Line Items]                
Estimated useful life (in years)           35 years    
Building | Maximum                
Real Estate [Line Items]                
Estimated useful life (in years)           50 years    
Building Improvements | Maximum                
Real Estate [Line Items]                
Estimated useful life (in years)           20 years