Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Construction Projects) (Narrative) (Details)

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Commitments And Contingencies (Construction Projects) (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
item
Sep. 30, 2016
item
Commitments And Contingencies [Line Items]        
Amount outstanding $ 822,288 $ 634,069    
Investment in unconsolidated joint ventures 36,060 $ 35,930 $ 78,027  
XS Hotel Urban Renewal Associates LLC [Member]        
Commitments And Contingencies [Line Items]        
Percentage of interest in venture     90.00%  
Costs of the project incurred $ 101,700      
Delivery date to tenant second quarter 2018      
Number of units | item     372  
Total project costs $ 139,400      
City Square Project [Member]        
Commitments And Contingencies [Line Items]        
Costs of the project incurred 86,900      
Total project costs $ 92,700      
City Square Project Phase One [Member]        
Commitments And Contingencies [Line Items]        
Delivery date to tenant first quarter 2018      
Number of units | item     237  
City Square Project Phase Two [Member]        
Commitments And Contingencies [Line Items]        
Delivery date to tenant third quarter 2018      
Number of units | item       128
250 Johnson Road [Member]        
Commitments And Contingencies [Line Items]        
Costs of the project incurred $ 53,900      
Delivery date to tenant first quarter 2018      
Number of units | item   197    
Total project costs $ 58,700      
Portside 5/6 [Member]        
Commitments And Contingencies [Line Items]        
Costs of the project incurred $ 101,300      
Delivery date to tenant second quarter 2018      
Number of units | item   296    
Total project costs $ 111,400      
Port Imperial South 11 [Member]        
Commitments And Contingencies [Line Items]        
Costs of the project incurred $ 83,600      
Delivery date to tenant second quarter 2018      
Number of units | item 295      
Total project costs $ 125,000      
Construction Loan [Member] | XS Hotel Urban Renewal Associates LLC [Member]        
Commitments And Contingencies [Line Items]        
Maximum borrowing capacity 94,000      
Amount outstanding 43,700      
Construction Loan [Member] | City Square Project [Member]        
Commitments And Contingencies [Line Items]        
Maximum borrowing capacity 58,000      
Amount outstanding 37,800      
Construction Loan [Member] | 250 Johnson Road [Member]        
Commitments And Contingencies [Line Items]        
Amount outstanding 32,500      
Amount to fund 42,000      
Construction Loan [Member] | Portside 5/6 [Member]        
Commitments And Contingencies [Line Items]        
Amount outstanding 45,800      
Amount to fund 73,000      
Construction Loan [Member] | Port Imperial South 11 [Member]        
Commitments And Contingencies [Line Items]        
Amount outstanding 46,100      
Amount to fund 78,000      
Development Property [Member] | Port Imperial South 11 [Member]        
Commitments And Contingencies [Line Items]        
Costs of the project incurred 37,500      
Amount to fund $ 47,000      
Unconsolidated Joint Venture Hotel [Member]        
Commitments And Contingencies [Line Items]        
Number of units | item 350