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Fair Value Measurements - Recurring Basis (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of mortgage and other indebtedness $ 2,661,981,000 $ 2,970,246,000
Available-for-sale securities - at fair value (amortized cost of $153,150 in 2020) [1] 153,172,000  
Available-for-sale securities, fair value 153,150,000  
Accrued interest receivable 1,082,000  
U.S. Treasury securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities - at fair value (amortized cost of $153,150 in 2020) 153,150,000  
Available-For-Sale Securities Held, unrealized gains/(losses) 22,000  
Available-for-sale securities, fair value $ 153,172,000  
[1] As of March 31, 2020, includes $367,622 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $171,605 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 7