Quarterly report pursuant to Section 13 or 15(d)

Recent Transactions (Schedule Of Dispositions/Rental Property Held For Sale) (Details)

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Recent Transactions (Schedule Of Dispositions/Rental Property Held For Sale) (Details) - Disposal Group, Not Discontinued Operations [Member]
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
ft²
item
Dec. 31, 2016
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Number of Buildings, Disposed | item 8  
Rentable Square Feet, Disposed | ft² 745,652  
Net Sales Proceeds $ 48,221  
Net Book Value 42,715  
Totals $ 5,506  
Cranford Portfolio [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Number of Buildings, Disposed | item 6  
Rentable Square Feet, Disposed | ft² 435,976  
Net Sales Proceeds $ 26,598  
Net Book Value 22,736  
Realized Gain (loss)/Unrealized Losses, net $ 3,862  
440 Route 22 East [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Number of Buildings, Disposed | item [1] 1  
Rentable Square Feet, Disposed | ft² [1] 198,376  
Net Sales Proceeds [1] $ 10,074  
Net Book Value [1] 10,069  
Realized Gain (loss)/Unrealized Losses, net [1] $ 5  
Impairments   $ 7,700
3 Independence Way [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Number of Buildings, Disposed | item 1  
Rentable Square Feet, Disposed | ft² 111,300  
Net Sales Proceeds $ 11,549  
Net Book Value 9,910  
Realized Gain (loss)/Unrealized Losses, net $ 1,639  
[1] The Company recorded a valuation allowance of $7.7 million on this property during the year ended December 31, 2016.