Annual report pursuant to Section 13 and 15(d)

Real Estate Investments - Acquistions (Details)

v2.4.1.9
Real Estate Investments - Acquistions (Details) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
note
Dec. 31, 2013
Dec. 31, 2012
Mar. 26, 2014
sqft
May 02, 2014
sqft
Oct. 02, 2014
sqft
Jun. 21, 2012
sqft
Feb. 21, 2014
Oct. 02, 2013
Business Acquisition [Line Items]                                  
Contract Purchase Price $ 2,470,953,000us-gaap_RealEstateInvestmentPropertyAtCost       $ 2,102,227,000us-gaap_RealEstateInvestmentPropertyAtCost       $ 2,470,953,000us-gaap_RealEstateInvestmentPropertyAtCost $ 2,102,227,000us-gaap_RealEstateInvestmentPropertyAtCost              
Real estate rental revenue 74,359,000us-gaap_RealEstateRevenueNet 73,413,000us-gaap_RealEstateRevenueNet 72,254,000us-gaap_RealEstateRevenueNet 68,611,000us-gaap_RealEstateRevenueNet 66,721,000us-gaap_RealEstateRevenueNet 65,828,000us-gaap_RealEstateRevenueNet 65,915,000us-gaap_RealEstateRevenueNet 64,560,000us-gaap_RealEstateRevenueNet 288,637,000us-gaap_RealEstateRevenueNet 263,024,000us-gaap_RealEstateRevenueNet 254,794,000us-gaap_RealEstateRevenueNet            
Land                 104,403,000us-gaap_PaymentsToAcquireLandHeldForUse 8,568,000us-gaap_PaymentsToAcquireLandHeldForUse 17,750,000us-gaap_PaymentsToAcquireLandHeldForUse            
Buildings                 172,671,000us-gaap_PaymentsToAcquireBuildings 37,930,000us-gaap_PaymentsToAcquireBuildings 26,893,000us-gaap_PaymentsToAcquireBuildings            
Tenant origination costs 9,377,000wre_TenantOriginationCosts       32,000wre_TenantOriginationCosts       9,377,000wre_TenantOriginationCosts 32,000wre_TenantOriginationCosts 3,100,000wre_TenantOriginationCosts            
Leasing commissions/absorption costs 16,474,000wre_LeasingCommissionsAbsorptionCosts       943,000wre_LeasingCommissionsAbsorptionCosts       16,474,000wre_LeasingCommissionsAbsorptionCosts 943,000wre_LeasingCommissionsAbsorptionCosts 4,172,000wre_LeasingCommissionsAbsorptionCosts            
Net lease intangible assets 7,331,000wre_NetLeaseIntangibleAssets       102,000wre_NetLeaseIntangibleAssets       7,331,000wre_NetLeaseIntangibleAssets 102,000wre_NetLeaseIntangibleAssets 508,000wre_NetLeaseIntangibleAssets            
Net lease intangible liabilities (8,323,000)wre_NetLeaseIntangibleLiabilities       (117,000)wre_NetLeaseIntangibleLiabilities       (8,323,000)wre_NetLeaseIntangibleLiabilities (117,000)wre_NetLeaseIntangibleLiabilities (173,000)wre_NetLeaseIntangibleLiabilities            
Fair value of assumed mortgage (107,125,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt       0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt       (107,125,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt            
Furniture, fixtures & equipment 932,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment       742,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment       932,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment 742,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment            
Total property purchase price                 195,740,000wre_TotalPropertyPurchasePrice 48,200,000wre_TotalPropertyPurchasePrice 52,250,000wre_TotalPropertyPurchasePrice            
Payments to Acquire Real Estate                 194,536,000us-gaap_PaymentsToAcquireRealEstate 48,200,000us-gaap_PaymentsToAcquireRealEstate 52,142,000us-gaap_PaymentsToAcquireRealEstate            
Number of Mortgage Notes Assumed                 2wre_NumberOfMortgageNotesAssumed                
Notes Assumed                 100,900,000us-gaap_NotesAssumed1                
Credits received at settlement                     100,000wre_CreditsReceivedAtSettlement            
Business Acquisition, Pro Forma Revenue                 295,876,000us-gaap_BusinessAcquisitionsProFormaRevenue 286,523,000us-gaap_BusinessAcquisitionsProFormaRevenue              
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax                 4,524,000us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax (4,128,000)us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax              
Business Acquisition, Pro Forma Net Income (Loss)                 111,055,000us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss 33,411,000us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss              
Business Acquisition, Pro Forma Earnings Per Share, Diluted                 $ 1.66us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted $ 0.50us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted              
Tenant Origination Costs Member                                  
Business Acquisition [Line Items]                                  
Weighted remaining average life, in months                 66 months                
Leasing Commissions Absorption Costs Member                                  
Business Acquisition [Line Items]                                  
Weighted remaining average life, in months                 59 months                
Net Lease Intangible Assets Member                                  
Business Acquisition [Line Items]                                  
Weighted remaining average life, in months                 69 months                
Net Lease Intangible Liabilities Member                                  
Business Acquisition [Line Items]                                  
Weighted remaining average life, in months                 105 months                
Property Acquired [Member]                                  
Business Acquisition [Line Items]                                  
Rentable Square Feet                 368,000wre_SquareFootageOfRealEstatePropertyAcquired
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
  142,000wre_SquareFootageOfRealEstatePropertyAcquired
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
           
Contract Purchase Price 297,000,000us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
      48,200,000us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
      297,000,000us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
48,200,000us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
52,250,000us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
           
Real estate rental revenue                 16,260,000us-gaap_RealEstateRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
907,000us-gaap_RealEstateRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
3,358,000us-gaap_RealEstateRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
           
Net (loss) income                 (3,168,000)us-gaap_NetInvestmentIncome
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
(105,000)us-gaap_NetInvestmentIncome
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
325,000us-gaap_NetInvestmentIncome
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
           
Property Acquired [Member] | Yale West [Member]                                  
Business Acquisition [Line Items]                                  
Contract Purchase Price                               73,000,000us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_YaleWestMember
 
Other Payments to Acquire Businesses                 3,600,000us-gaap_OtherPaymentsToAcquireBusinesses
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_YaleWestMember
               
Property Acquired [Member] | The Army Navy Club Building [Member]                                  
Business Acquisition [Line Items]                                  
Rentable Square Feet                       108,000wre_SquareFootageOfRealEstatePropertyAcquired
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_TheArmyNavyClubBuildingMember
         
Contract Purchase Price                       79,000,000us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_TheArmyNavyClubBuildingMember
         
Property Acquired [Member] | 1775 Eye Street [Member]                                  
Business Acquisition [Line Items]                                  
Rentable Square Feet                         185,000wre_SquareFootageOfRealEstatePropertyAcquired
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_A1775EyeStreetMember
       
Contract Purchase Price                         104,500,000us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_A1775EyeStreetMember
       
Other Payments to Acquire Businesses                 1,900,000us-gaap_OtherPaymentsToAcquireBusinesses
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_A1775EyeStreetMember
               
Property Acquired [Member] | Spring Vally Retail Center [Member]                                  
Business Acquisition [Line Items]                                  
Rentable Square Feet                           75,000wre_SquareFootageOfRealEstatePropertyAcquired
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SpringVallyRetailCenterMember
     
Contract Purchase Price                           40,500,000us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SpringVallyRetailCenterMember
     
Property Acquired [Member] | The Paramount [Member]                                  
Business Acquisition [Line Items]                                  
Contract Purchase Price                                 48,200,000us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_TheParamountMember
Property Acquired [Member] | Fairgate at Ballston [Member]                                  
Business Acquisition [Line Items]                                  
Rentable Square Feet                             142,000wre_SquareFootageOfRealEstatePropertyAcquired
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FairgateAtBallstonMember
   
Contract Purchase Price                             $ 52,250,000us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_BusinessAcquisitionAxis
= wre_PropertyAcquiredMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FairgateAtBallstonMember