Annual report pursuant to Section 13 and 15(d)

Real Estate Investments - Continuing Operations (Details)

v2.4.1.9
Real Estate Investments - Continuing Operations (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Real Estate Properties [Line Items]    
Real estate investment property, at cost $ 2,470,953us-gaap_RealEstateInvestmentPropertyAtCost $ 2,102,227us-gaap_RealEstateInvestmentPropertyAtCost
Properties under development or held for future development 76,235us-gaap_DevelopmentInProcess 61,315us-gaap_DevelopmentInProcess
Office [Member]    
Real Estate Properties [Line Items]    
Real estate investment property, at cost 1,502,052us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= wre_OfficeMember
1,296,967us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= wre_OfficeMember
Properties under development or held for future development 36,379us-gaap_DevelopmentInProcess
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= wre_OfficeMember
12,175us-gaap_DevelopmentInProcess
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= wre_OfficeMember
Retail [Member]    
Real Estate Properties [Line Items]    
Real estate investment property, at cost 463,716us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= wre_RetailMember
415,899us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= wre_RetailMember
Properties under development or held for future development 500us-gaap_DevelopmentInProcess
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= wre_RetailMember
495us-gaap_DevelopmentInProcess
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= wre_RetailMember
Multifamily [Member]    
Real Estate Properties [Line Items]    
Real estate investment property, at cost 505,185us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= wre_MultifamilyMember
389,361us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= wre_MultifamilyMember
Properties under development or held for future development 39,356us-gaap_DevelopmentInProcess
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= wre_MultifamilyMember
48,645us-gaap_DevelopmentInProcess
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= wre_MultifamilyMember
Six Fifty North Glebe Road [Member]    
Real Estate Properties [Line Items]    
Real estate investment property, at cost 31,300us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
 
Properties under development or held for future development 17,900us-gaap_DevelopmentInProcess
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
 
Variable Interest Entity, Consolidated, Carrying Amount, Assets $ 17,947us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
$ 27,343us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember