Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
Commitments And Contingencies (Construction Projects) (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
item
Commitments And Contingencies [Line Items]        
Costs of the project incurred $ 39,054 $ 42,598 $ 49,624  
Number of units | item 1,317      
Amount outstanding $ 790,939 $ 822,288    
XS Hotel Urban Renewal Associates LLC [Member]        
Commitments And Contingencies [Line Items]        
Percentage of interest in venture       90.00%
Development costs 147,100      
Number of units | item       372
Total project costs $ 159,900      
XS Hotel Urban Renewal Associates LLC, Residence Inn [Member]        
Commitments And Contingencies [Line Items]        
Number of units | item       164
XS Hotel Urban Renewal Associates LLC, Marriott Envue [Member]        
Commitments And Contingencies [Line Items]        
Number of units | item       208
Portside 5/6 [Member]        
Commitments And Contingencies [Line Items]        
Number of units | item 296      
Chase III, Overlook Ridge [Member]        
Commitments And Contingencies [Line Items]        
Costs of the project incurred $ 20,200      
Delivery date to tenant fourth quarter 2020      
Number of units | item 326      
Amount to fund $ 37,900      
Building 89 [Member]        
Commitments And Contingencies [Line Items]        
Costs of the project incurred $ 35,400      
Delivery date to tenant fourth quarter 2020      
Number of units | item 313      
Total project costs $ 142,600      
Amount to fund 50,600      
Construction Loan [Member] | XS Hotel Urban Renewal Associates LLC [Member]        
Commitments And Contingencies [Line Items]        
Maximum borrowing capacity 94,000      
Amount outstanding 73,400      
Construction Loan [Member] | Chase III, Overlook Ridge [Member]        
Commitments And Contingencies [Line Items]        
Total project costs 99,900      
Amount to fund 62,000      
Construction Loan [Member] | Building 89 [Member]        
Commitments And Contingencies [Line Items]        
Development costs 35,400      
Amount outstanding $ 92,000