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Stock Based Compensation (Unamortized Value Of Awards With Market Conditions) (Details) (USD $) In Thousands | 9 Months Ended
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Sep. 30, 2011
Relative TSR [Member] | Restricted Share Awards [Member] |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |
Unamortized value of shares | $ 894
Relative TSR [Member] | Unrestricted Share Awards [Member] |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |
Unamortized value of shares | 834
Absolute TSR [Member] | Restricted Share Awards [Member] |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |
Unamortized value of shares | 306
Absolute TSR [Member] | Unrestricted Share Awards [Member] |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |
Unamortized value of shares | $ 286

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Unamortized Value Of Shares + Details
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Namespace Prefix: | wre
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration