Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation (Details)

v2.4.0.8
Stock Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   $ 1.2 $ 1.3 $ 3.6 $ 4.0
CEO consulting fees 0.5        
Restricted Share Awards [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       103,312  
Share grants awarded at weighted average grant date fair       $ 26.97  
Fair value of share grants vested       0.7 0.3
Total unvested restricted share awards (in shares)   224,484   224,484  
Weighted average grant date fair value (in dollars per share)   $ 27.24   $ 27.24  
Total compensation costs, non-vested restricted share awards   $ 2.1   $ 2.1  
Total compensation cost not yet recognized, period for recognition (in months)       15 months  
Washington Real Estate Investment Trust 2007 Omnibus Long-Term Incentive Plan [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock based plan, aggregate number of shares authorized (in shares)   2,000,000   2,000,000  
Stock based plan, period in effect (in years)       10 years