Quarterly report pursuant to Section 13 or 15(d)

Unsecured Lines of Credit Payable - Line of Credit Facility, Increase (decrease), net (Details)

v2.4.1.9
Unsecured Lines of Credit Payable - Line of Credit Facility, Increase (decrease), net (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Line of Credit Facility, Increase (Decrease) During the Period [Roll Forward]    
Balance at December 31, 2014   $ 50,000us-gaap_LineOfCredit
Balance at March 31, 2015 30,000us-gaap_LineOfCredit 50,000us-gaap_LineOfCredit
Credit Facility No. 1 | Line of Credit    
Line of Credit Facility, Increase (Decrease) During the Period [Roll Forward]    
Balance at December 31, 2014 5,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= wre_CreditFacilityNo1Member
 
Repayments (5,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= wre_CreditFacilityNo1Member
 
Balance at March 31, 2015 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= wre_CreditFacilityNo1Member
 
Credit Facility No. 2 | Line of Credit    
Line of Credit Facility, Increase (Decrease) During the Period [Roll Forward]    
Balance at December 31, 2014 45,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= wre_CreditFacilityNo2Member
 
Repayments (15,000)us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= wre_CreditFacilityNo2Member
 
Balance at March 31, 2015 $ 30,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= wre_CreditFacilityNo2Member