Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Narrative (Details)

v3.20.2
Stock Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense $ 2.0 $ 1.7 $ 3.8 $ 4.5
Restricted Share Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of share awards vested     $ 0.8 $ 1.7
Total unvested restricted share awards (in shares) 502,500   502,500  
Weighted average grant date fair value (in dollars per share) $ 29.99   $ 29.99  
Total compensation cost related to unvested restricted share awards $ 10.3   $ 10.3  
Total compensation cost related to unvested restricted share awards, expected period for recognition (in months)     25 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  
Stock based plan, period in effect (in years)     10 years