Quarterly report pursuant to Section 13 or 15(d)

Real Estate - Variable Interest Entities (Details)

v2.4.1.9
Real Estate - Variable Interest Entities (Details) (USD $)
3 Months Ended 1 Months Ended
Mar. 31, 2015
Nov. 30, 2011
Dec. 31, 2014
Real Estate Properties [Line Items]      
Land 543,247,000us-gaap_Land   $ 543,546,000us-gaap_Land
Mortgage notes payable 419,250,000us-gaap_SecuredDebt   418,525,000us-gaap_SecuredDebt
First Street 1225 [Member]      
Real Estate Properties [Line Items]      
Variable interest entity, qualitative or quantitative information, ownership percentage 95.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ us-gaap_RealEstatePropertiesAxis
= wre_FirstStreet1225Member
   
Noncontrolling interest, ownership percentage by noncontrolling owners 5.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RealEstatePropertiesAxis
= wre_FirstStreet1225Member
   
Percentage of capital contribution through debt 70.00%wre_PercentageOfCapitalContributionThroughDebt
/ us-gaap_RealEstatePropertiesAxis
= wre_FirstStreet1225Member
   
Six Fifty North Glebe Road [Member]      
Real Estate Properties [Line Items]      
Variable interest entity, qualitative or quantitative information, ownership percentage 90.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ us-gaap_RealEstatePropertiesAxis
= wre_SixFiftyNorthGlebeRoadMember
   
Noncontrolling interest, ownership percentage by noncontrolling owners 10.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RealEstatePropertiesAxis
= wre_SixFiftyNorthGlebeRoadMember
   
650 N Glebe [Member] [Domain]      
Real Estate Properties [Line Items]      
Mortgage notes payable 29,535,000us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= wre_A650NGlebeMemberDomain
  27,700,000us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= wre_A650NGlebeMemberDomain
Six Fifty North Glebe Road [Member]      
Real Estate Properties [Line Items]      
Land 12,851,000us-gaap_Land
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  12,851,000us-gaap_Land
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
Investment Building and Building Improvements 37,647,000us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  18,432,000us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (543,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  0us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
Land and capitalized development costs related to joint ventures 0us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  17,947,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
Other Assets 393,000us-gaap_OtherAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  0us-gaap_OtherAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
Real Estate Investments, Joint Ventures 50,348,000us-gaap_RealEstateInvestmentsJointVentures
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  49,230,000us-gaap_RealEstateInvestmentsJointVentures
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
Construction Payable 2,006,000us-gaap_ConstructionPayableCurrentAndNoncurrent
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  2,196,000us-gaap_ConstructionPayableCurrentAndNoncurrent
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
Accrued Liabilities 35,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  17,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
Accounts payable and accrued liabilities related to joint ventures 31,576,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
  29,903,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_SixFiftyNorthGlebeRoadMember
First Street 1225 [Member]      
Real Estate Properties [Line Items]      
Cash, Cash Equivalents, and Short-term Investments 390,000us-gaap_CashCashEquivalentsAndShortTermInvestments
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FirstStreet1225Member
  395,000us-gaap_CashCashEquivalentsAndShortTermInvestments
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FirstStreet1225Member
Land and capitalized development costs related to joint ventures 20,807,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FirstStreet1225Member
  20,807,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FirstStreet1225Member
Accounts payable and accrued liabilities related to joint ventures 81,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FirstStreet1225Member
  38,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FirstStreet1225Member
First Street 1225 [Member] | First Street 1225 [Member]      
Real Estate Properties [Line Items]      
Estimated development costs   $ 95,300,000wre_EstimatedDevelopmentCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_FirstStreet1225Member
/ us-gaap_RealEstatePropertiesAxis
= wre_FirstStreet1225Member