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Investments in Partially Owned Entities (825 Seventh Avenue) (Details)
ft² in Thousands, $ in Thousands
Jul. 25, 2019
USD ($)
ft²
Jul. 24, 2019
USD ($)
Sep. 30, 2019
USD ($)
Joint Venture | 825 Seventh Avenue      
Schedule Of Equity Method Investments      
Equity method ownership percentage 50.00%    
825 Seventh Avenue | Matures in 2022 | Office      
Schedule Of Equity Method Investments      
Loans payable $ 60,000   $ 28,882
Square footage of real estate property (in sqft) | ft² 165    
Length of extension available (years) 1 year    
Debt instrument, interest rate, stated percentage (percent)     3.78%
825 Seventh Avenue | Maturing in September 2019 | Office      
Schedule Of Equity Method Investments      
Loans payable   $ 20,500  
LIBOR | 825 Seventh Avenue | Matures in 2022 | Office      
Schedule Of Equity Method Investments      
Spread Over LIBOR (percent) 1.65%    
LIBOR | 825 Seventh Avenue | Maturing in September 2019 | Office      
Schedule Of Equity Method Investments      
Spread Over LIBOR (percent)   1.40%