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Commitments and Contingencies (Litigation and contingencies) (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 15, 2015
USD ($)
Jun. 24, 2014
USD ($)
Feb. 28, 2014
Fires
Mar. 31, 2016
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2001
a
Paramus Property                
Mortgages payable, net of deferred debt issuance costs           $ 1,052,359,000 $ 1,053,262,000  
Letters Of Credit                
Standby letters of credit, outstanding           2,074,000    
Letters Of Credit Issued           $ 2,074,000    
Minimum                
Paramus Property                
Lease term range as Lessor           5 years    
Maximum                
Paramus Property                
Lease term range as Lessor           25 years    
Rego Park I                
Loss Contingency                
Proceeds from Legal Settlements           $ 825,000 $ 2,100,000  
Rego Park I | Sears                
Loss Contingency                
Number Of Fires | Fires     2          
Rego Park I | Sears | Minimum                
Loss Contingency                
Loss Contingency, Damages Sought, Value   $ 4,000,000            
Rego Park I | Sears | Minimum | Estimated Future Damages                
Loss Contingency                
Loss Contingency, Damages Sought, Value   $ 25,000,000            
Rego Park I | Sears | Forecast                
Loss Contingency                
Loss Contingency, Damages Sought, Value       $ 650,000        
Rego Park I | Sears | Forecast | Maximum                
Loss Contingency                
Estimate of possible loss           650,000    
Paramus | Tenant Occupant | Ikea                
Paramus Property                
Area Of Land | a               30.3
Mortgages payable, net of deferred debt issuance costs           $ 68,000,000    
Fixed interest rate on the debt (in percentage)           2.90%    
Debt Instrument Maturity Date String           Oct. 01, 2018    
Triple-net rent, annual amount           $ 700,000    
Paramus | Tenant Occupant | Ikea | Forecast                
Paramus Property                
Property purchase option exercisable be leasee with purchase option in 2021         $ 75,000,000      
Purchase option exercised, net cash proceeds from sale of land         7,000,000      
Purchase option excercised, gain on sale of land         60,000,000      
Purchase option not excercised amount included in triple net rent over remainder of lease         $ 68,000,000      
Loan Amortization Period         20 years      
Lease term range as Lessor         20 years      
The Kings Plaza Regional Shopping Center                
Loss Contingency                
Loss Contingency, Damages Sought, Value $ 21,300,000