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Unsecured Senior Notes Schedule of Unsecured Senior Notes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 04, 2017
Dec. 31, 2016
Aug. 17, 2016
Debt Instrument [Line Items]        
Deferred finance costs, net $ (34,680)      
Total 7,247,330   $ 7,245,953  
Boston Properties Limited Partnership        
Debt Instrument [Line Items]        
Deferred finance costs, net (34,700)      
Total 7,247,330   $ 7,245,953  
Boston Properties Limited Partnership | Senior Notes [Member]        
Debt Instrument [Line Items]        
Principal Amount 7,300,000      
Net unamortized discount (17,894)      
Deferred finance costs, net (34,776)      
Total $ 7,247,330      
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 5.967%        
Debt Instrument [Line Items]        
Coupon/Stated Rate 5.875%      
Effective Rate [1] 5.967%      
Principal Amount $ 700,000      
Maturity date [2] Oct. 15, 2019      
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 5.708%        
Debt Instrument [Line Items]        
Coupon/Stated Rate 5.625%      
Effective Rate [1] 5.708%      
Principal Amount $ 700,000      
Maturity date [2] Nov. 15, 2020      
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 4.289%        
Debt Instrument [Line Items]        
Coupon/Stated Rate 4.125%      
Effective Rate [1] 4.289%      
Principal Amount $ 850,000      
Maturity date [2] May 15, 2021      
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 3.954%        
Debt Instrument [Line Items]        
Coupon/Stated Rate 3.85%      
Effective Rate [1] 3.954%      
Principal Amount $ 1,000,000      
Maturity date [2] Feb. 01, 2023      
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 3.279%        
Debt Instrument [Line Items]        
Coupon/Stated Rate 3.125%      
Effective Rate [1] 3.279%      
Principal Amount $ 500,000      
Maturity date [2] Sep. 01, 2023      
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 3.916%        
Debt Instrument [Line Items]        
Coupon/Stated Rate 3.80%      
Effective Rate [1] 3.916%      
Principal Amount $ 700,000      
Maturity date [2] Feb. 01, 2024      
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 3.35% [Member]        
Debt Instrument [Line Items]        
Coupon/Stated Rate 3.20% 3.20%    
Effective Rate 3.35% [1] 3.35%    
Principal Amount $ 850,000      
Maturity date [2] Jan. 15, 2025      
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Note 3.766%        
Debt Instrument [Line Items]        
Coupon/Stated Rate 3.65%      
Effective Rate [1] 3.766%      
Principal Amount $ 1,000,000      
Maturity date [2] Feb. 01, 2026      
Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Note 3.495%        
Debt Instrument [Line Items]        
Coupon/Stated Rate 2.75%     2.75%
Effective Rate [1] 3.495%      
Principal Amount $ 1,000,000      
Maturity date [2] Oct. 01, 2026      
[1] Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.
[2] No principal amounts are due prior to maturity.