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Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock based compensation expense | $ 2.7 | $ 2.1 | $ 6.5 | $ 5.9 |
Restricted share awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Fair value of share awards vested |  |  | $ 1.6 | $ 0.8 |
Total unvested restricted share awards (in shares) | 430,993 |  | 430,993 |  |
Weighted average grant date fair value (in dollars per share) |  |  |  |  | $ 28.46
Compensation costs not yet recognized |  |  |  |  | $ 5.7
Recognition period for compensation expense |  |  | 18 months |  |
Washington Real Estate Investment Trust 2016 Omnibus Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Aggregate number of shares authorized for stock based awards (in shares) | 2,400,000 |  | 2,400,000 |  |
Incentive plan, period in effect (in years) |  |  | 10 years |  |

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