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Impairment (Summary of Impairments) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Real Estate [Line Items]        
Impairment of real estate $ 672,492 $ 0 $ 672,492 $ 0
Total Impairment   $ 0   $ 0
Seaport Segment        
Real Estate [Line Items]        
Impairment of real estate 672,492   672,492  
Investments in unconsolidated ventures 37,001   37,001  
Total Impairment 709,493   709,493  
Seaport Segment | Buildings and equipment        
Real Estate [Line Items]        
Impairment of real estate 450,944   450,944  
Seaport Segment | Land        
Real Estate [Line Items]        
Impairment of real estate 11,106   11,106  
Seaport Segment | Developments        
Real Estate [Line Items]        
Impairment of real estate $ 210,442   $ 210,442