Recent Transactions (Schedule Of Purchase Price Allocation) (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
USD ($)
Above Market, In-Place And Below Market Leases [Member]  
Business Acquisition [Line Items]  
Amortization period 8 years 1 month 6 days
11 Martine Avenue [Member]  
Business Acquisition [Line Items]  
Land and leasehold interest $ 2,460
Buildings and improvements 8,290
Net assets recorded upon acquisition/consolidation 10,750
320, 321 University Avenue [Member]  
Business Acquisition [Line Items]  
Land and leasehold interest 7,305
Buildings and improvements 15,695
Net assets recorded upon acquisition/consolidation 23,000
101 Wood Avenue South [Member]  
Business Acquisition [Line Items]  
Land and leasehold interest 8,509
Buildings and improvements 72,738
Above market leases 58 [1]
In-place lease values 6,743 [1]
Sub Total 88,048
Less: Below market lease values (5,748) [1]
Net assets recorded upon acquisition/consolidation 82,300
111 River Street [Member]  
Business Acquisition [Line Items]  
Land and leasehold interest 204
Buildings and improvements 198,609
Above market leases 617 [1]
In-place lease values 43,801 [1]
Other assets 11,279
Sub Total 254,510
Less: Below market lease values (43,749) [1]
Net assets recorded upon acquisition/consolidation $ 210,761
[1] Above market, in-place and below market leases will be amortized over a weighted-average term of 8.1 years.