Quarterly report pursuant to Section 13 or 15(d)

Unsecured Lines of Credit Payable - Narrative (Details)

v2.4.1.9
Unsecured Lines of Credit Payable - Narrative (Details) (Line of Credit, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Credit Facility No. 1  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Expiration Date Jun. 30, 2015
Line of Credit Facility, Maximum Borrowing Capacity $ 100,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= wre_CreditFacilityNo1Member
Credit Facility No. 2  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Expiration Date Jul. 31, 2016
Line of Credit Facility, Maximum Borrowing Capacity 400,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= wre_CreditFacilityNo2Member
Credit Facility Accordion Feature | Credit Facility No. 1  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity 200,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= wre_CreditFacilityNo1Member
/ us-gaap_StatementScenarioAxis
= wre_CreditFacilityAccordionFeatureMember
Credit Facility Accordion Feature | Credit Facility No. 2  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity $ 600,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= wre_CreditFacilityNo2Member
/ us-gaap_StatementScenarioAxis
= wre_CreditFacilityAccordionFeatureMember