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Noncontrolling Interests (Property Partnerships) (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 21, 2024
USD ($)
Sep. 30, 2024
USD ($)
ft²
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
ft²
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Jan. 05, 2023
ft²
Noncontrolling Interest [Line Items]              
Noncontrolling Interest in Limited Partnerships   $ 1,874,272   $ 1,874,272   $ 1,640,704  
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships   $ 95,724 $ 22,635 $ 306,147 $ 30,190    
Construction in Progress              
Noncontrolling Interest [Line Items]              
Net Rentable Area (in sf) | ft²   2,700,000   2,700,000      
290 Binney              
Noncontrolling Interest [Line Items]              
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships $ 97,200            
Noncontrolling Interest, Increase from Sale of Parent Equity Interest 104,600 $ (27,100)   $ 7,800      
Difference Between Proceeds from Sale and Noncontrolling Interest $ 7,500            
Percent of Carrying Value of Real Estate, Gross 45.00%            
290 Binney | Construction in Progress | Office and Life Sciences Building [Member]              
Noncontrolling Interest [Line Items]              
Net Rentable Area (in sf) | ft²   573,000   573,000     573,000
Leased percentage   100.00%   100.00%     100.00%
290 Binney | Noncontrolling Interest [Member] | Consolidated Joint Venture Partner              
Noncontrolling Interest [Line Items]              
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 45.00%            
290 Binney | Noncontrolling Interest [Member] | Company's Share [Member]              
Noncontrolling Interest [Line Items]              
Noncontrolling Interest, Ownership Percentage by Parent 55.00%