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Mortgages Payable (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 14, 2020
Dec. 12, 2018
Dec. 31, 2019
Dec. 31, 2018
Oct. 03, 2018
Oct. 02, 2018
Debt Instrument [Line Items]            
Mortgages payable, net of deferred debt issuance costs     $ 970,961 $ 965,826    
Net carrying value of real estate collateralizing the debt     $ 573,975      
Document Period End Date     Dec. 31, 2019      
Paramus, NJ            
Debt Instrument [Line Items]            
Interest rate           2.90%
Paramus, NJ | Matures in October 2021            
Debt Instrument [Line Items]            
Mortgages payable, net of deferred debt issuance costs         $ 68,000  
Interest rate         4.72%  
Rego Park II | Matures in December 2025            
Debt Instrument [Line Items]            
Interest rate     3.15%      
Mortgages            
Debt Instrument [Line Items]            
Mortgages payable, net of deferred debt issuance costs     $ 970,961 $ 965,826    
Mortgages | Paramus, NJ            
Debt Instrument [Line Items]            
Interest rate     4.72%      
Mortgages | Retail space | Rego Park II            
Debt Instrument [Line Items]            
Interest rate     3.15%      
Mortgages | Retail space | Rego Park II | Matures in December 2025            
Debt Instrument [Line Items]            
Mortgages payable, net of deferred debt issuance costs   $ 252,544        
Loan participation balance     $ 195,708      
Mortgages payable, net of loan participation     $ 56,836      
LIBOR | Mortgages | Retail space | Rego Park II            
Debt Instrument [Line Items]            
Basis spread over LIBOR     1.35%      
LIBOR | Mortgages | Retail space | Rego Park II | Matures in December 2025            
Debt Instrument [Line Items]            
Basis spread over LIBOR   1.35%        
Subsequent Event | Rego Park II            
Debt Instrument [Line Items]            
Loan participation balance $ 50,000          
Proceeds from loan participation $ 145,000