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Derivative Instruments and Hedging Activities Derivative Instrument and Hedging Activities Notional Table (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Jan. 06, 2016
Derivative [Line Items]        
Fair Value $ (58,646) $ (3,533)    
Interest Rate Swap [Member]        
Derivative [Line Items]        
Notional Amount 1,000,000   $ 950,000  
Fair Value (68,948)   (10,302)  
Boston Properties Limited Partnership | Interest Rate Swap [Member]        
Derivative [Line Items]        
Notional Amount 550,000   550,000  
Fair Value (36,561)   (4,231)  
Boston Properties Limited Partnership | Interest Rate Swap [Member] | Interest Rate Swap Range 2.129% - 2.571% [Member]        
Derivative [Line Items]        
Derivative Liability, Notional Amount $ 550,000      
Derivative, Lower Fixed Interest Rate Range 2.129%      
Derivative, Higher Fixed Interest Rate Range 2.571%      
Fair Value $ (36,561)      
Boston Properties Limited Partnership | Interest Rate Swap [Member] | Interest Rate Swap Range 2.348% - 2.571% [Member]        
Derivative [Line Items]        
Derivative Liability, Notional Amount     $ 400,000  
Derivative, Lower Fixed Interest Rate Range     2.348%  
Derivative, Higher Fixed Interest Rate Range     2.571%  
Fair Value     $ (5,419)  
Boston Properties Limited Partnership | Interest Rate Swap [Member] | Interest Rate Swap Range 2.129% - 2.325% [Member]        
Derivative [Line Items]        
Derivative Asset, Notional Amount     $ 150,000  
Derivative, Lower Fixed Interest Rate Range     2.129%  
Derivative, Higher Fixed Interest Rate Range     2.325%  
Fair Value     $ 1,188  
767 Fifth Partners LLC [Member] | Interest Rate Swap [Member]        
Derivative [Line Items]        
Notional Amount 450,000   400,000 $ 50,000
Fair Value (32,387)   (6,071)  
767 Fifth Partners LLC [Member] | Interest Rate Swap [Member] | Interest Rate Swap Range 2.336% - 2.950% [Member]        
Derivative [Line Items]        
Derivative Liability, Notional Amount $ 450,000      
Derivative, Lower Fixed Interest Rate Range 2.336%      
Derivative, Higher Fixed Interest Rate Range 2.95%      
Fair Value $ (32,387)      
767 Fifth Partners LLC [Member] | Interest Rate Swap [Member] | Interest Rate Swap Range 2.677% - 2.950% [Member]        
Derivative [Line Items]        
Derivative Liability, Notional Amount     $ 250,000  
Derivative, Lower Fixed Interest Rate Range     2.677%  
Derivative, Higher Fixed Interest Rate Range     2.95%  
Fair Value     $ (7,247)  
767 Fifth Partners LLC [Member] | Interest Rate Swap [Member] | Interest Rate Swap Range 2.336% - 2.430% [Member]        
Derivative [Line Items]        
Derivative Asset, Notional Amount     $ 150,000  
Derivative, Lower Fixed Interest Rate Range     2.336%  
Derivative, Higher Fixed Interest Rate Range     2.43%  
Fair Value     $ 1,176