v3.26.3
Investments in Partially Owned Entities (Schedule of Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Schedule Of Equity Method Investments        
Equity in net income     $ 99,335 $ 135,588
Return on preferred equity, net of our share of the expense     86,015 80,548
Our share of net income (loss) $ 23,318 $ 21,940 $ 99,335 135,588
Fifth Avenue and Times Square JV        
Schedule Of Equity Method Investments        
Interest 51.50%   51.50%  
Equity in net income $ 3,652 2,286 $ 13,588 11,772
Return on preferred equity, net of our share of the expense 6,241 6,241 18,519 21,287
Net gain on sale 0 0 0 76,162
Our share of net income (loss) $ 9,893 8,527 $ 32,107 109,221
Alexander's        
Schedule Of Equity Method Investments        
Interest 32.40%   32.40%  
Equity in net income $ 8,805 2,069 $ 12,579 7,911
Net gain on sale 0 0 44,329 0
Management, leasing and development fees 3,013 1,405 7,750 4,444
Our share of net income (loss) 11,818 3,474 64,658 12,355
Partially owned office buildings        
Schedule Of Equity Method Investments        
Our share of net income (loss) (3,691) 6,953 (8,488) 976
Other investments        
Schedule Of Equity Method Investments        
Our share of net income (loss) $ 5,298 $ 2,986 $ 11,058 $ 13,036