Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation (Details)

v3.21.1
Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based compensation expense $ 1.7 $ 1.8
Restricted share awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of share awards vested $ 1.0 $ 0.4
Total unvested restricted share awards (in shares) 463,100  
Weighted average grant date fair value (in dollars per share) $ 28.36  
Compensation costs not yet recognized $ 9.2  
Recognition period for compensation expense 23 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  
Incentive plan, period in effect (in years) 10 years