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Investments in Partially Owned Entities (Schedule of Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Schedule Of Equity Method Investments        
Equity in net income     $ 76,017 $ 113,648
Return on preferred equity, net of our share of the expense     52,871 54,205
Our share of net income (loss) $ 63,195 $ 16,671 $ 76,017 113,648
Fifth Avenue and Times Square JV        
Schedule Of Equity Method Investments        
Interest 51.50%   51.50%  
Equity in net income $ 5,613 3,649 $ 9,936 9,486
Return on preferred equity, net of our share of the expense 6,173 6,503 12,278 15,046
Net gain on sale 0 0 0 76,162
Our share of net income (loss) $ 11,786 10,152 $ 22,214 100,694
Alexander's        
Schedule Of Equity Method Investments        
Interest 32.40%   32.40%  
Equity in net income $ 2,319 1,919 $ 3,774 5,842
Net gain on sale 44,329 0 44,329 0
Management, leasing and development fees 3,492 1,406 4,737 3,039
Our share of net income (loss) 50,140 3,325 52,840 8,881
Partially owned office buildings        
Schedule Of Equity Method Investments        
Our share of net income (loss) (1,962) (2,355) (4,797) (5,977)
Other investments        
Schedule Of Equity Method Investments        
Our share of net income (loss) $ 3,231 $ 5,549 $ 5,760 $ 10,050