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Noncontrolling Interests (Property Partnerships) (Narrative) (Details)
$ in Thousands
12 Months Ended
Mar. 21, 2024
USD ($)
Dec. 31, 2024
USD ($)
ft²
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jan. 05, 2023
ft²
Noncontrolling Interest [Line Items]          
Noncontrolling Interest in Limited Partnerships   $ 1,933,545 $ 1,640,704    
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships   $ 376,544 $ 244,541 $ 849  
Construction in Progress          
Noncontrolling Interest [Line Items]          
Net Rentable Area (in sf) | ft²   2,300,000      
290 Binney Street          
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        
Difference Between Proceeds from Sale and Noncontrolling Interest $ 7,500        
Percent of Carrying Value of Real Estate, Gross 45.00%        
290 Binney Street | Construction in Progress | Office and Life Sciences Building [Member]          
Noncontrolling Interest [Line Items]          
Net Rentable Area (in sf) | ft²   573,000     573,000
Leased percentage   100.00%     100.00%
290 Binney Street | Noncontrolling Interest [Member] | Consolidated Joint Venture Partner          
Noncontrolling Interest [Line Items]          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 45.00%        
290 Binney Street | Noncontrolling Interest [Member] | Company's Share [Member]          
Noncontrolling Interest [Line Items]          
Noncontrolling Interest, Ownership Percentage by Parent 55.00%