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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 |  |

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