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Noncontrolling Interests (Property Partnerships) (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 28, 2023
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Noncontrolling Interest [Line Items]        
Noncontrolling Interest in Limited Partnerships   $ 1,588,906 $ 1,588,906 $ 1,547,317
Contribution of Property   $ 17,519 $ 17,519  
Variable Interest Entity, Primary Beneficiary [Member] | 343 Madison Avenue        
Noncontrolling Interest [Line Items]        
Consolidated Entities, Ownership Percentage 0.55      
Payments to Acquire Investments $ 5,900      
Contribution of Property $ 21,400      
Variable Interest Entity, Not Primary Beneficiary | 343 Madison Avenue        
Noncontrolling Interest [Line Items]        
Consolidated Entities, Ownership Percentage 0.45      
Payments to Acquire Investments $ 4,800      
Contribution of Property $ 17,500