Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation - Narrative (Details)

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Stock Based Compensation - Narrative (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Washington Real Estate Investment Trust 2016 Omnibus Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized (in shares) 2,400,000  
Plan in effect, period (in years) 10 years  
Options outstanding (in shares) 0 0
Washington Real Estate Investment Trust 2007 Omnibus Long-Term Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized (in shares) 2,000,000