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Unsecured Senior Notes (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 21, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Total $ 8,390,708   $ 7,544,697
Boston Properties Limited Partnership      
Debt Instrument [Line Items]      
Total 8,390,708   $ 7,544,697
Boston Properties Limited Partnership | Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross 8,450,000    
Net unamortized discount 18,802    
Deferred financing costs, net 40,490    
Total $ 8,390,708    
Boston Properties Limited Partnership | Senior Notes [Member] | 10 Year Unsecured Senior Notes 5.708% [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.625%    
Debt Instrument, Interest Rate, Effective Percentage [1] 5.708%    
Long-term Debt, Gross $ 700,000    
Debt Instrument, Maturity Date [2] Nov. 15, 2020    
Boston Properties Limited Partnership | Senior Notes [Member] | 10 Year Unsecured Senior Notes 4.289% [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.125%    
Debt Instrument, Interest Rate, Effective Percentage [1] 4.289%    
Long-term Debt, Gross $ 850,000    
Debt Instrument, Maturity Date [2] May 15, 2021    
Boston Properties Limited Partnership | Senior Notes [Member] | 11 Year Unsecured Senior Notes 3.954%[Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.85%    
Debt Instrument, Interest Rate, Effective Percentage [1] 3.954%    
Long-term Debt, Gross $ 1,000,000    
Debt Instrument, Maturity Date [2] Feb. 01, 2023    
Boston Properties Limited Partnership | Senior Notes [Member] | 10.5 year Unsecured Senior Notes 3.279% [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.125%    
Debt Instrument, Interest Rate, Effective Percentage [1] 3.279%    
Long-term Debt, Gross $ 500,000    
Debt Instrument, Maturity Date [2] Sep. 01, 2023    
Boston Properties Limited Partnership | Senior Notes [Member] | 10.5 Year Unsecured Senior Notes 3.916%[Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.80%    
Debt Instrument, Interest Rate, Effective Percentage [1] 3.916%    
Long-term Debt, Gross $ 700,000    
Debt Instrument, Maturity Date [2] Feb. 01, 2024    
Boston Properties Limited Partnership | Senior Notes [Member] | 7 Year Unsecured Senior Notes 3.350% [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.20%    
Debt Instrument, Interest Rate, Effective Percentage [1] 3.35%    
Long-term Debt, Gross $ 850,000    
Debt Instrument, Maturity Date [2] Jan. 15, 2025    
Boston Properties Limited Partnership | Senior Notes [Member] | 10 Year Unsecured Senior Notes 3.766%[Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.65%    
Debt Instrument, Interest Rate, Effective Percentage [1] 3.766%    
Long-term Debt, Gross $ 1,000,000    
Debt Instrument, Maturity Date [2] Feb. 01, 2026    
Boston Properties Limited Partnership | Senior Notes [Member] | 10 Year Unsecured Senior Notes 3.495% [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 2.75%    
Debt Instrument, Interest Rate, Effective Percentage [1] 3.495%    
Long-term Debt, Gross $ 1,000,000    
Debt Instrument, Maturity Date [2] Oct. 01, 2026    
Boston Properties Limited Partnership | Senior Notes [Member] | 10 Year Unsecured Senior Notes 4.628%[Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.50%    
Debt Instrument, Interest Rate, Effective Percentage [1] 4.628%    
Long-term Debt, Gross $ 1,000,000    
Debt Instrument, Maturity Date [2] Dec. 01, 2028    
Boston Properties Limited Partnership | Senior Notes [Member] | 10 Year Unsecured Senior Notes 3.505% [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.40% 3.40%  
Debt Instrument, Interest Rate, Effective Percentage [1] 3.505% 3.505%  
Long-term Debt, Gross $ 850,000 $ 850,000  
Debt Instrument, Maturity Date [2] Jun. 21, 2029    
[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.