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Noncontrolling Interests (Property Partnerships) (Narrative) (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Nov. 13, 2023
USD ($)
Buildings
Jul. 28, 2023
USD ($)
Dec. 31, 2023
USD ($)
Real_Estate_Properties
Dec. 31, 2023
USD ($)
Real_Estate_Properties
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Noncontrolling Interest [Line Items]            
Noncontrolling Interest in Limited Partnerships     $ 1,640,704 $ 1,640,704 $ 1,547,317  
Contribution of Property       17,519 0 $ 0
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships       $ 244,541 $ 849 $ 18,002
Construction in Progress            
Noncontrolling Interest [Line Items]            
Number of real estate properties | Real_Estate_Properties     10 10    
Noncontrolling Interest [Member] | 343 Madison Avenue            
Noncontrolling Interest [Line Items]            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   45.00%        
Parent | 343 Madison Avenue            
Noncontrolling Interest [Line Items]            
Noncontrolling Interest, Ownership Percentage by Parent   55.00%        
343 Madison Avenue | Noncontrolling Interest [Member]            
Noncontrolling Interest [Line Items]            
Payments to Acquire Investments   $ 4,800        
Contribution of Property   17,500        
343 Madison Avenue | Parent            
Noncontrolling Interest [Line Items]            
Payments to Acquire Investments   5,900        
Contribution of Property   $ 21,400        
300 Binney and 290 Binney | Construction in Progress            
Noncontrolling Interest [Line Items]            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 45.00%          
Number of real estate properties | Buildings 2          
300 Binney Street            
Noncontrolling Interest [Line Items]            
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships $ 212,900          
Noncontrolling Interest, Increase from Sale of Parent Equity Interest 35,500   $ 17,000      
Difference Between Proceeds from Sale and Noncontrolling Interest $ 177,400          
300 Binney Street | Noncontrolling Interest [Member]            
Noncontrolling Interest [Line Items]            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 45.00%          
Noncontrolling Interest, Ownership Percentage by Parent 55.00%