Annual report pursuant to Section 13 and 15(d)

Notes Payable (Details)

v2.4.1.9
Notes Payable (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Total principal $ 414,500us-gaap_DebtInstrumentCarryingAmount  
Notes Payable 747,208us-gaap_NotesPayable 846,703us-gaap_NotesPayable
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Total principal 750,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Net unamortized discount (2,792)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Notes Payable 747,208us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Unsecured Debt [Member] | 10 Year Unsecured Notes 5.359% [Member]    
Debt Instrument [Line Items]    
Coupon stated rate 5.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wre_A10YearUnsecuredNotes5359Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Effective rate 5.359%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= wre_A10YearUnsecuredNotes5359Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
[1]  
Notes Payable 50,000us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= wre_A10YearUnsecuredNotes5359Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Debt Instrument, Maturity Date May 01, 2015 [2]  
Unsecured Debt [Member] | 10 Year Unsecured Notes 5.49% [Member]    
Debt Instrument [Line Items]    
Coupon stated rate 5.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wre_A10YearUnsecuredNotes549Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Effective rate 5.49%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= wre_A10YearUnsecuredNotes549Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
[1]  
Notes Payable 100,000us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= wre_A10YearUnsecuredNotes549Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Debt Instrument, Maturity Date May 01, 2015 [2]  
Unsecured Debt [Member] | 10 Year Unsecured Notes 5.053% [Member]    
Debt Instrument [Line Items]    
Coupon stated rate 4.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wre_A10YearUnsecuredNotes5053Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Effective rate 5.053%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= wre_A10YearUnsecuredNotes5053Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
[1]  
Notes Payable 250,000us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= wre_A10YearUnsecuredNotes5053Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Debt Instrument, Maturity Date Oct. 01, 2020 [2]  
Unsecured Debt [Member] | 10 Year Unsecured Notes 3.950 % [Member]    
Debt Instrument [Line Items]    
Coupon stated rate 3.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wre_ThreePointNineFivePercentUnsecuredNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Effective rate 4.018%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= wre_ThreePointNineFivePercentUnsecuredNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
[1]  
Notes Payable 300,000us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= wre_ThreePointNineFivePercentUnsecuredNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Debt Instrument, Maturity Date Oct. 15, 2022 [2]  
Unsecured Debt [Member] | 20 Year Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Coupon stated rate 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wre_A20YearUnsecuredNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Effective rate 7.36%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= wre_A20YearUnsecuredNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
[1]  
Notes Payable $ 50,000us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= wre_A20YearUnsecuredNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Debt Instrument, Maturity Date Feb. 25, 2028 [2]  
Unsecured Debt [Member] | 10 Year Unsecured Notes 5.125% [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayment Terms 100000  
Unsecured Debt [Member] | 10 Year Unsecured Notes 5.34% [Member]    
Debt Instrument [Line Items]    
Coupon stated rate 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wre_A10YearUnsecuredNotes534Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
[1] Yield on issuance date, including the effects of discounts on the notes.
[2] No principal amounts are due prior to maturity.