Annual report pursuant to Section 13 and 15(d)

Accounting Policies Fair value of in place leases (Details)

v2.4.1.9
Accounting Policies Fair value of in place leases (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Tenant Origination Costs Member    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 56,327us-gaap_FiniteLivedIntangibleAssetsGross
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_TenantOriginationCostsMember
$ 47,697us-gaap_FiniteLivedIntangibleAssetsGross
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_TenantOriginationCostsMember
Finite-Lived Intangible Assets, Accumulated Amortization 35,463us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_TenantOriginationCostsMember
29,653us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_TenantOriginationCostsMember
Finite-Lived Intangible Assets, Net 20,864us-gaap_FiniteLivedIntangibleAssetsNet
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_TenantOriginationCostsMember
18,044us-gaap_FiniteLivedIntangibleAssetsNet
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_TenantOriginationCostsMember
Leasing Commissions Absorption Costs Member    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 93,729us-gaap_FiniteLivedIntangibleAssetsGross
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_LeasingCommissionsAbsorptionCostsMember
78,629us-gaap_FiniteLivedIntangibleAssetsGross
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_LeasingCommissionsAbsorptionCostsMember
Finite-Lived Intangible Assets, Accumulated Amortization 60,289us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_LeasingCommissionsAbsorptionCostsMember
48,376us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_LeasingCommissionsAbsorptionCostsMember
Finite-Lived Intangible Assets, Net 33,440us-gaap_FiniteLivedIntangibleAssetsNet
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_LeasingCommissionsAbsorptionCostsMember
30,253us-gaap_FiniteLivedIntangibleAssetsNet
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_LeasingCommissionsAbsorptionCostsMember
Net Lease Intangible Assets Member    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 19,724us-gaap_FiniteLivedIntangibleAssetsGross
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_NetLeaseIntangibleAssetsMember
12,495us-gaap_FiniteLivedIntangibleAssetsGross
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_NetLeaseIntangibleAssetsMember
Finite-Lived Intangible Assets, Accumulated Amortization 9,495us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_NetLeaseIntangibleAssetsMember
7,008us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_NetLeaseIntangibleAssetsMember
Finite-Lived Intangible Assets, Net 10,229us-gaap_FiniteLivedIntangibleAssetsNet
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_NetLeaseIntangibleAssetsMember
5,487us-gaap_FiniteLivedIntangibleAssetsNet
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_NetLeaseIntangibleAssetsMember
Net Lease Intangible Liabilities Member    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Liabilities, Net Lease, Gross 34,027wre_FiniteLivedIntangibleLiabilitiesNetLeaseGross
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_NetLeaseIntangibleLiabilitiesMember
26,348wre_FiniteLivedIntangibleLiabilitiesNetLeaseGross
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_NetLeaseIntangibleLiabilitiesMember
Finite-lived Intangible Liabilities, Net Lease, Accumulated Amortization 20,974wre_FiniteLivedIntangibleLiabilitiesNetLeaseAccumulatedAmortization
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_NetLeaseIntangibleLiabilitiesMember
19,403wre_FiniteLivedIntangibleLiabilitiesNetLeaseAccumulatedAmortization
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_NetLeaseIntangibleLiabilitiesMember
Finite-lived Intangible Liabilities, Net Lease, Net 13,053wre_FiniteLivedIntangibleLiabilitiesNetLeaseNet
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_NetLeaseIntangibleLiabilitiesMember
6,945wre_FiniteLivedIntangibleLiabilitiesNetLeaseNet
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_NetLeaseIntangibleLiabilitiesMember
Leases, Acquired-in-Place, Below-Market Ground Lease [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 12,080us-gaap_FiniteLivedIntangibleAssetsGross
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_LeasesAcquiredInPlaceBelowMarketGroundLeaseMember
12,080us-gaap_FiniteLivedIntangibleAssetsGross
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_LeasesAcquiredInPlaceBelowMarketGroundLeaseMember
Finite-Lived Intangible Assets, Accumulated Amortization 1,335us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_LeasesAcquiredInPlaceBelowMarketGroundLeaseMember
1,145us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_LeasesAcquiredInPlaceBelowMarketGroundLeaseMember
Finite-Lived Intangible Assets, Net $ 10,745us-gaap_FiniteLivedIntangibleAssetsNet
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_LeasesAcquiredInPlaceBelowMarketGroundLeaseMember
$ 10,935us-gaap_FiniteLivedIntangibleAssetsNet
/ wre_ComponentsOfFairValueOfInPlaceLeasesAxis
= wre_LeasesAcquiredInPlaceBelowMarketGroundLeaseMember