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Earnings Per Share / Common Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Basic Earnings:        
Net income attributable to the company's common shareholders / unitholders $ 222,989 $ 111,703 $ 366,044 $ 203,372
Net income attributable to the company's common shareholders / unitholders (in shares / units) 156,720,000 156,107,000 156,685,000 156,016,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit) $ 1.42   $ 2.33  
Allocation of undistributed earnings to participating securities $ (267)   $ (236)  
Allocation of undistributed earnings to participating securities (in shares / units) 0   0  
Allocation of undistributed earnings to participating securities (in dollars per share / unit) $ 0   $ 0  
Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic $ 222,722 $ 111,703 $ 365,808 $ 203,372
Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares) 156,720,000 156,107,000 156,685,000 156,016,000
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share) $ 1.42 $ 0.72 $ 2.33 $ 1.30
Effect of Dilutive Securities:        
Stock Based Compensation $ 0 $ 0 $ 0 $ 0
Stock Based Compensation (in shares / units) 472,000 412,000 413,000 291,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share) $ 0 $ (0.01) $ 0 $ 0
Diluted Earnings:        
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders $ 222,722 $ 111,703 $ 365,808 $ 203,372
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units) 157,192,000 156,519,000 157,098,000 156,307,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) $ 1.42 $ 0.71 $ 2.33 $ 1.30
Boston Properties Limited Partnership        
Redeemable Common Units 17,672,000 17,043,000 17,638,000 17,018,000
Basic Earnings:        
Net income attributable to the company's common shareholders / unitholders $ 253,788 $ 125,846 $ 415,617 $ 231,619
Net income attributable to the company's common shareholders / unitholders (in shares / units) 174,392,000 173,150,000 174,323,000 173,034,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit) $ 1.45   $ 2.38 $ 1.34
Allocation of undistributed earnings to participating securities $ (297)   $ (263)  
Allocation of undistributed earnings to participating securities (in shares / units) 0   0  
Allocation of undistributed earnings to participating securities (in dollars per share / unit) $ 0   $ 0  
Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic $ 253,491 $ 125,846 $ 415,354 $ 231,619
Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares) 174,392,000 173,150,000 174,323,000 173,034,000
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share) $ 1.45 $ 0.73 $ 2.38 $ 1.34
Effect of Dilutive Securities:        
Stock Based Compensation $ 0 $ 0 $ 0 $ 0
Stock Based Compensation (in shares / units) 472,000 412,000 413,000 291,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share) $ 0 $ 0 $ 0 $ 0
Diluted Earnings:        
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders $ 253,491 $ 125,846 $ 415,354 $ 231,619
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units) 174,864,000 173,562,000 174,736,000 173,325,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) $ 1.45 $ 0.73 $ 2.38 $ 1.34