Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Narrative (Details)

v3.20.1
Stock Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based compensation expense $ 1.8 $ 2.8
Restricted Share Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of share awards vested $ 0.4 $ 1.3
Total unvested restricted share awards (in shares) 503,600  
Weighted average grant date fair value (in dollars per share) $ 29.99  
Total compensation cost related to unvested restricted share awards $ 11.9  
Total compensation cost related to unvested restricted share awards, expected period for recognition (in months) 27 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  
Stock based plan, period in effect (in years) 10 years