Recent Transactions (Schedule Of Disposed Properties) (Details)
$ in Thousands |
|
3 Months Ended |
|
|
|
Apr. 01, 2019
USD ($)
item
|
Mar. 31, 2019
USD ($)
ft²
item
shares
|
Dec. 31, 2018
USD ($)
|
Dec. 31, 2017
USD ($)
|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
|
|
| Valuation allowance |
|
$ 11,600
|
|
$ 5,300
|
| Disposal Group, Not Discontinued Operations [Member] |
|
|
|
|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
|
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| Number of Buildings, Disposed | item |
|
62
|
|
|
| Rentable Square Feet, Disposed | ft² |
|
3,645,028
|
|
|
| Net Sales Proceeds |
|
$ 555,635
|
|
|
| Net Carrying Value |
|
285,026
|
|
|
| Realized Gains (losses)/Unrealized Losses, net |
|
270,609
|
|
|
| Unrealized losses on rental properties held for sale |
|
(2,500)
|
|
|
| Totals |
|
$ 268,109
|
|
|
| Disposal Group, Not Discontinued Operations [Member] | 721 Route 202/206 South [Member] |
|
|
|
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
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| Number of Buildings, Disposed | item |
|
1
|
|
|
| Rentable Square Feet, Disposed | ft² |
|
192,741
|
|
|
| Net Sales Proceeds |
|
$ 5,651
|
|
|
| Net Carrying Value |
|
5,410
|
|
|
| Realized Gains (losses)/Unrealized Losses, net |
|
$ 241
|
|
|
| Valuation allowance |
|
|
$ 9,300
|
|
| Disposal Group, Not Discontinued Operations [Member] | Park Square [Member] |
|
|
|
|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
|
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| Number of Buildings, Disposed | item |
|
1
|
|
|
| Rentable Square Feet, Disposed | ft² |
|
159
|
|
|
| Net Sales Proceeds |
|
$ 34,045
|
|
|
| Net Carrying Value |
|
34,032
|
|
|
| Realized Gains (losses)/Unrealized Losses, net |
|
13
|
|
|
| Net sales proceeds held by qualified intermediary |
|
$ 9,000
|
|
|
| Valuation allowance |
|
|
6,300
|
|
| Disposal Group, Not Discontinued Operations [Member] | 2115 Linwood Avenue [Member] |
|
|
|
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
|
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| Number of Buildings, Disposed | item |
|
1
|
|
|
| Rentable Square Feet, Disposed | ft² |
|
68,000
|
|
|
| Net Sales Proceeds |
|
$ 15,197
|
|
|
| Net Carrying Value |
|
7,433
|
|
|
| Realized Gains (losses)/Unrealized Losses, net |
|
$ 7,764
|
|
|
| Disposal Group, Not Discontinued Operations [Member] | 201 Littleton Road [Member] |
|
|
|
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
|
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| Number of Buildings, Disposed | item |
|
1
|
|
|
| Rentable Square Feet, Disposed | ft² |
|
88,369
|
|
|
| Net Sales Proceeds |
|
$ 4,842
|
|
|
| Net Carrying Value |
|
4,937
|
|
|
| Realized Gains (losses)/Unrealized Losses, net |
|
(95)
|
|
|
| Net sales proceeds held by qualified intermediary |
|
$ 4,900
|
|
|
| Valuation allowance |
|
|
$ 3,600
|
|
| Disposal Group, Not Discontinued Operations [Member] | 320 & 321 University Avenue [Member] |
|
|
|
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
|
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| Number of Buildings, Disposed | item |
|
2
|
|
|
| Rentable Square Feet, Disposed | ft² |
|
147,406
|
|
|
| Net Sales Proceeds |
|
$ 25,552
|
|
|
| Net Carrying Value |
|
18,456
|
|
|
| Realized Gains (losses)/Unrealized Losses, net |
|
$ 7,096
|
|
|
| Disposal Group, Not Discontinued Operations [Member] | Flex Portfolio [Member] |
|
|
|
|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
|
|
| Number of Buildings, Disposed | item |
|
56
|
|
|
| Number of properties disposed | item |
|
2
|
|
|
| Rentable Square Feet, Disposed | ft² |
|
3,148,512
|
|
|
| Net Sales Proceeds |
|
$ 470,348
|
|
|
| Net Carrying Value |
|
214,758
|
|
|
| Realized Gains (losses)/Unrealized Losses, net |
|
255,590
|
|
|
| Carrying Amount of Mortgages |
|
350,000
|
|
|
| Net sales proceeds held by qualified intermediary |
|
$ 251,000
|
|
|
| Redemption of common units, shares | shares |
|
301,638
|
|
|
| Proceeds from sale of properties |
|
$ 6,600
|
|
|
| Disposal Group, Not Discontinued Operations [Member] | Flex Portfolio [Member] | Unsecured Term Loan [Member] |
|
|
|
|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
|
|
| Repayment of mortgage loans |
|
90,000
|
|
|
| Disposal Group, Not Discontinued Operations [Member] | Unsecured Revolving Credit Facility [Member] | Flex Portfolio [Member] |
|
|
|
|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
|
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| Carrying Amount of Mortgages |
|
$ 119,900
|
|
|
| Subsequent Event [Member] | Jersey City, New Jersey [Member] |
|
|
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
|
|
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| Number Of Units | item |
377
|
|
|
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| Funds from qualified intermediary |
$ 217,400
|
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