Annual report pursuant to Section 13 and 15(d)

Real Estate Investments - Real Estate Impairment (Details)

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Real Estate Investments - Real Estate Impairment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Real Estate Properties [Line Items]        
Real estate impairment, including amounts in discontinued operations $ 2,100wre_RealEstateImpairmentIncludingDiscontinuedOperations $ 0wre_RealEstateImpairmentIncludingDiscontinuedOperations $ 0wre_RealEstateImpairmentIncludingDiscontinuedOperations $ 2,097wre_RealEstateImpairmentIncludingDiscontinuedOperations
Real Estate Investment Property, Net   1,906,754us-gaap_RealEstateInvestmentPropertyNet 1,598,200us-gaap_RealEstateInvestmentPropertyNet  
4661 Kenmore Avenue [Member]        
Real Estate Properties [Line Items]        
Real Estate Investment Property, Net   $ 3,800us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_A4661KenmoreAvenueMember