Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation (Details)

v3.21.2
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