Recent Transactions (Dispositions/Rental Property Held for Sale) (Narrative) (Details)
$ in Thousands |
1 Months Ended |
2 Months Ended |
12 Months Ended |
|
Feb. 28, 2018
USD ($)
|
Feb. 28, 2017
USD ($)
|
Dec. 31, 2017
USD ($)
ft²
item
property
|
Dec. 31, 2016
USD ($)
ft²
item
property
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
| Assets held for sale, Deferred charges and other assets |
|
|
|
$ 1,700
|
| Assets held for sale, Unbilled rents receivable, net |
|
|
|
1,200
|
| Assets held for sale, Accounts payable, accrued expenses and other liabilities |
|
|
|
1,100
|
| Assets held for sale, Rents received in advance and security deposits |
|
|
|
1,900
|
| Expected assets to be written off |
|
|
|
2,900
|
| Expected liabilities to be written off |
|
|
|
$ 500
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Three Office Properties Disposed [Member] |
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
| Sales proceeds |
|
$ 45,800
|
|
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Office [Member] |
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
| Area of property (in square feet) | ft² |
|
|
|
750,000
|
| Number of properties held for sale | property |
|
|
|
8
|
| Estimated expected sales proceeds |
|
|
|
$ 49,000
|
| Disposal Group, Not Discontinued Operations [Member] |
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
| Unrealized losses on rental properties held for sale |
|
|
$ (12,331)
|
(7,665)
|
| Sales proceeds |
|
|
$ 399,332
|
$ 664,481
|
| Number of properties sold | item |
|
|
60
|
30
|
| Parsippany, Paramus, Rochelle Park, Hamilton And Wall, New Jersey And White Plains, New York [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
| Assets held for sale, Deferred charges and other assets |
|
|
$ 9,800
|
|
| Assets held for sale, Unbilled rents receivable, net |
|
|
4,700
|
|
| Assets held for sale, Accounts payable, accrued expenses and other liabilities |
|
|
4,600
|
|
| Expected assets to be written off |
|
|
13,400
|
|
| Expected liabilities to be written off |
|
|
$ 300
|
|
| Parsippany, Paramus, Rochelle Park, Hamilton And Wall, New Jersey And White Plains, New York [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Office [Member] |
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
| Area of property (in square feet) | ft² |
|
|
2,000,000
|
|
| Number of properties held for sale | property |
|
|
21
|
|
| Estimated expected sales proceeds |
|
|
$ 223,000
|
|
| Number of properties not epected to recover from estimated net sales proceeds | property |
|
|
7
|
|
| Parsippany, Paramus, Rochelle Park, Hamilton And Wall, New Jersey And White Plains, New York [Member] | Disposal Group, Not Discontinued Operations [Member] | Office [Member] | Subsequent Event [Member] |
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
| Sales proceeds |
$ 25,900
|
|
|
|