Quarterly report pursuant to Section 13 or 15(d)

Cover

v3.21.1
Cover - shares
3 Months Ended
Mar. 31, 2021
Apr. 26, 2021
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2021  
Document Transition Report false  
Entity File Number 1-6622  
Entity Registrant Name WASHINGTON REAL ESTATE INVESTMENT TRUST  
Entity Central Index Key 0000104894  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 53-0261100  
Entity Address, Address Line One 1775 EYE STREET, NW  
Entity Address, Address Line Two SUITE 1000  
Entity Address, City or Town WASHINGTON  
Entity Address, State or Province DC  
Entity Address, Postal Zip Code 20006  
City Area Code 202  
Local Phone Number 774-3200  
Title of 12(b) Security Shares of Beneficial Interest  
Trading Symbol WRE  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   84,581,984