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
|
|
|
|