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Investments in Partially Owned Entities (Alexander's Inc.) (Details) - Alexanders Inc - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Apr. 05, 2018
Nov. 30, 2012
Sep. 30, 2018
Equity Method Investments And Income From Equity Method Investments      
Ownership common shares, investee (in shares)     1,654,068
Equity method ownership percentage     32.40%
Closing share price (in dollars per share)     $ 343.30
Equity method investment fair value     $ 567,842
Excess of investee's fair value over carrying amount     456,000
Excess of investee's carrying amount over equity in net assets     39,093
Additional real estate transfer tax     $ 7,708
Kings Plaza Regional Shopping Center      
Equity Method Investments And Income From Equity Method Investments      
Real estate transfer tax   $ 3,971  
Additional real estate transfer tax $ 23,797    
Vornado Realty Trust      
Equity Method Investments And Income From Equity Method Investments      
Equity method ownership percentage     32.40%