Annual report pursuant to Section 13 and 15(d)

Real Estate Investments - Noncontrolling Interests in Subsidiaries and VIEs (Details)

v2.4.1.9
Real Estate Investments - Noncontrolling Interests in Subsidiaries and VIEs (Details) (USD $)
12 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2014
Jun. 30, 2011
Dec. 31, 2013
Nov. 30, 2011
Aug. 31, 2007
acre
Feb. 21, 2013
Real Estate Properties [Line Items]            
Percentage of capital contribution through debt 70.00%wre_PercentageOfCapitalContributionThroughDebt          
Land $ 543,546,000us-gaap_Land   $ 426,575,000us-gaap_Land      
Mortgage notes payable 418,525,000us-gaap_SecuredDebt   294,671,000us-gaap_SecuredDebt      
Minimum [Member]            
Real Estate Properties [Line Items]            
Ownership percentage 90.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
         
Maximum [Member]            
Real Estate Properties [Line Items]            
Ownership percentage 95.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
         
4661 Kenmore Avenue [Member]            
Real Estate Properties [Line Items]            
Land, Acres Held         0.8wre_LandAcresHeld
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_A4661KenmoreAvenueMember
 
Six Fifty North Glebe Road [Member]            
Real Estate Properties [Line Items]            
Variable Interest Entity, Consolidated, Carrying Amount, Assets 17,947,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  27,343,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
     
Estimated development costs   49,900,000wre_EstimatedDevelopmentCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
       
Construction loan agreement           33,000,000wre_Constructionloanagreement
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
Ownership percentage   90.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
       
Percentage Of residential property to be leased to achieve project stabilization stage   90.00%wre_PercentageOfResidentialPropertyToBeLeasedToAchieveProjectStabilizationStage
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
       
Ownership percentage by noncontrolling owners   10.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
       
Land 12,851,000us-gaap_Land
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  0us-gaap_Land
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
     
Investment Building and Building Improvements 18,432,000us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  0us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
     
Real Estate Investments, Joint Ventures 49,230,000us-gaap_RealEstateInvestmentsJointVentures
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  27,343,000us-gaap_RealEstateInvestmentsJointVentures
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
     
Mortgage notes payable 27,690,000us-gaap_SecuredDebt
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  7,297,000us-gaap_SecuredDebt
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
[1],[2]      
Construction Payable 2,196,000us-gaap_ConstructionPayableCurrentAndNoncurrent
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  1,785,000us-gaap_ConstructionPayableCurrentAndNoncurrent
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
     
Accrued Liabilities 17,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  0us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
     
Variable Interest Entity, Classification of Carrying Amount, Liabilities 29903   9082      
1225 First Street [Member]            
Real Estate Properties [Line Items]            
Variable Interest Entity, Consolidated, Carrying Amount, Assets 20,807,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FirstStreet1225Member
  20,788,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FirstStreet1225Member
     
Estimated development costs       95,300,000wre_EstimatedDevelopmentCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FirstStreet1225Member
   
Ownership percentage       95.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FirstStreet1225Member
   
Ownership percentage by noncontrolling owners       5.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FirstStreet1225Member
   
Percentage of capital contribution through debt       70.00%wre_PercentageOfCapitalContributionThroughDebt
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FirstStreet1225Member
   
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities $ 38,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FirstStreet1225Member
  $ 39,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FirstStreet1225Member
     
[1] Interest rate on The Maxwell is variable, based on LIBOR plus 2.15%. The maturity date can be extended for up to two years, subject to fees and compliance with certain provisions in the loan agreement, until February 20, 2018.
[2] Interest only is payable monthly until the maturity date upon which all unpaid principal and interest are payable in full.