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Real Estate Transactions - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended
May 09, 2018
shares
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
May 31, 2018
USD ($)
a
shares
Aug. 31, 2016
a
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Real Estate [Line Items]              
Payments to acquire real estate           $ 2,874 $ 3,483
Real estate investments   $ 1,948,165       $ 1,981,414  
Ashbrook Marketplace              
Real Estate [Line Items]              
Area of real estate acquired (in acres) | a       13.7      
Additions to real estate investments, noncash       $ 8,800      
Acquisition costs       $ 200      
7316 Wisconsin Avenue              
Real Estate [Line Items]              
Payments to acquire real estate     $ 35,500        
Property acquisition costs     $ 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