Annual report pursuant to Section 13 and 15(d)

Cover Page

Cover Page - USD ($)
12 Months Ended
Dec. 31, 2019
Feb. 13, 2020
Jun. 28, 2019
Cover page.      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-06622    
Entity Central Index Key 0000104894    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 53-0261100    
Entity Address, Address Line One 1775 EYE STREET    
Entity Address, Address Line Two NW, 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 Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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 Public Float     $ 2,125,135,478
Entity Common Stock, Shares Outstanding   82,115,352  
Documents Incorporated by Reference [Text Block] Portions of our definitive Proxy Statement relating to the 2020 Annual Meeting of Shareholders, to be filed with the Securities and Exchange Commission, are incorporated by reference in Part III, Items 10-14 of this Annual Report on Form 10-K as indicated herein.