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Summary of Significant Accounting Policies - Deferred Leasing Incentives (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Deferred Leasing Incentives [Line Items] |  |  |
Amortization of deferred leasing incentives | $ 789 | $ 664 | $ 208
Gross Carrying Value Deferred Leasing Incentives [Member] |  |  |
Deferred Leasing Incentives [Line Items] |  |  |
Gross Carrying Value | 6,578 | 4,651 |
Accumulated Amortization Deferred Leasing Incentives [Member] |  |  |
Deferred Leasing Incentives [Line Items] |  |  |
Accumulated Amortization | 1,698 | 909 |
Net Deferred Leasing Incentives [Member] |  |  |
Deferred Leasing Incentives [Line Items] |  |  |
Net | $ 4,880 | $ 3,742 |

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- Definition This item represents the deferred charge for an incentive or inducement granted by a lessor to a lessee, in order to motivate the lessee to enter the lease agreement, which incentive or inducement is to be recognized as a reduction of rental revenue over the lease term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e40019-112707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Technical Bulletin (FTB) -Number 88-1 -Paragraph 6-9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Technical Bulletin (FTB) -Number 85-3 -Paragraph 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e40010-112707 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Lease Incentive -URI http://asc.fasb.org/extlink&oid=6516590 + Details
Name: | us-gaap_IncentiveToLessee
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Deferred Leasing Incentives Amortization + References No definition available. + Details
Name: | wre_DeferredLeasingIncentivesAmortization
Namespace Prefix: | wre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | wre_DeferredLeasingIncentivesLineItems
Namespace Prefix: | wre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Incentive to Lessee, Accumulated Amortization + References No definition available. + Details
Name: | wre_IncentiveToLesseeAccumulatedAmortization
Namespace Prefix: | wre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Incentive to Lessee, Gross + References No definition available. + Details
Name: | wre_IncentiveToLesseeGross
Namespace Prefix: | wre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant