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Noncontrolling Interests (Property Partnerships) (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2024
USD ($)
ft²
Mar. 21, 2024
USD ($)
Mar. 31, 2024
USD ($)
ft²
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Jan. 05, 2023
ft²
Noncontrolling Interest [Line Items]            
Noncontrolling Interest in Limited Partnerships $ 1,734,904   $ 1,734,904   $ 1,640,704  
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships     $ 142,942 $ 7,555    
Construction in Progress            
Noncontrolling Interest [Line Items]            
Net Rentable Area (in sf) | ft² 3,200,000   3,200,000      
290 Binney            
Noncontrolling Interest [Line Items]            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   45.00%        
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 $ 50,700 104,600        
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 566,000   566,000     566,000
Leased percentage 100.00%   100.00%     100.00%
290 Binney | Noncontrolling Interest [Member]            
Noncontrolling Interest [Line Items]            
Noncontrolling Interest, Ownership Percentage by Parent   55.00%