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Stock Based Compensation (Schedules Of Fair Market Value Of Restricted Shares) (Details) (USD $) In Thousands | 9 Months Ended
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Sep. 30, 2011
Relative TSR [Member] | Restricted Share Awards [Member] |
Grant Date Fair Value | $ 1,066
Relative TSR [Member] | Unrestricted Share Awards [Member] |
Grant Date Fair Value | 1,066
Absolute TSR [Member] | Restricted Share Awards [Member] |
Grant Date Fair Value | 365
Absolute TSR [Member] | Unrestricted Share Awards [Member] |
Grant Date Fair Value | $ 365

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Grant Date Fair Value + Details
Name: | wre_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodGrantDateFairValue
Namespace Prefix: | wre
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration