Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation (Narrative) (Details)

 v2.3.0.11
Stock Based Compensation (Narrative) (Details) (USD $)
6 Months Ended
Jun. 30, 2011
New STIP [Member]
 
Percentage of cash portion pursuant to deferred compensation plan 80.00%
Percentage of deferred amounts in restricted cash 25.00%
Percentage of restricted shares subject to performance conditions 20.00%
New STIP [Member] | Performance-Based Awards [Member]
 
Vesting period three
New STIP [Member] | Performance-Based Awards [Member] | Cash [Member]
 
Percentage of awards earned 50.00%
New STIP [Member] | Performance-Based Awards [Member] | Restricted Share Units [Member]
 
Percentage of awards earned 50.00%
New STIP [Member] | Service-Based Awards [Member]
 
Vesting period three
New STIP [Member] | Service-Based Awards [Member] | Restricted Share Units [Member]
 
Percentage of awards earned 15.00%
New LTIP [Member]
 
Percentage of restricted shares subject to performance conditions 60.00%
Percentage of potential award depend upon market condition 40.00%
New LTIP [Member] | Restricted Share Units [Member]
 
Percentage of awards earned 50.00%
Vesting period one
New LTIP [Member] | Unrestricted Share Units [Member]
 
Percentage of awards earned 50.00%
New LTIP [Member] | Restricted Share Awards [Member]
 
Compensation expense recognized period 4
New LTIP [Member] | Unrestricted Share Awards [Member]
 
Compensation expense recognized period 3
Prior LTIP [Member]
 
Vesting period five
Compensation expense recognized period 6
Number of restricted shares subsequent to adoption of new share-based compensation plan 154,400
Remaining unvested restricted shares granted 0
Restricted shares granted during the period 0
Washington Real Estate Investment Trust 2007 Omnibus Long-Term Incentive Plan [Member]
 
Stock based plan, aggregate number of shares authorized 2,000,000
Stock based plan, period in force 10
Vest on December 31, 2011 [Member] | Restricted Share Units [Member]
 
Total number of share units awarded 89,000
Vest on December 31, 2012 [Member] | Restricted Share Units [Member]
 
Total number of share units awarded 65,400
Restricted And Unrestricted Shares [Member]
 
Total Fair value of vested shares 28,800
Shares vested 0
Remaining unvested restricted shares granted 10,822
Restricted shares granted during the period 10,822
Unamortized value of share units 300,000
Unamortized value of unvested share awards 295,200
Compensation cost of restricted shares 1,000,000
Weighted average period of recognition, unamortized value (months) 30
Options [Member]
 
Options outstanding 114,403
Exercise price, minimum 24.85
Exercise price, maximum 33.09
Weighted average exercise price, options outstanding 27.23
Weighted average remaining contractual term, options outstanding (years) 1.8
Aggregate intrinsic value of outstanding exercisable shares 600,000
Options exercised 31,582
Aggregate intrinsic value of options exercised 200,000
Restricted Share Units [Member]
 
Total Fair value of vested shares 247,100
Value of unvested restricted share units 5,000,000
Weighted average period of recognition, compensation cost (months) 28
Weighted average period of recognition, unamortized value (months) 30
Future expected expense expected to be awarded to non-officers 1,100,000
Restricted Share Awards [Member]
 
Weighted average period of recognition, unamortized value (months) 42
Unrestricted Share Awards [Member]
 
Weighted average period of recognition, unamortized value (months) 30