Recent Transactions (Rental Property Held for Sale, Net) (Narrative) (Details)
$ in Thousands |
6 Months Ended |
|
Jun. 30, 2017
USD ($)
ft²
property
|
|---|
| Real Estate Properties [Line Items] |
|
| Unrealized losses on rental properties held for sale |
$ (45,746)
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |
|
| Real Estate Properties [Line Items] |
|
| Assets held for sale, Deferred charges and other assets |
13,800
|
| Assets held for sale, Unbilled rents receivable, net |
10,900
|
| Assets held for sale, Accounts payable, accrued expenses and other liabilities |
4,200
|
| Expected assets to be written off |
23,400
|
| Expected liabilities to be written off |
$ 600
|
| East Brunswick, New Jersey [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Office [Member] |
|
| Real Estate Properties [Line Items] |
|
| Area of property (in square feet) | ft² |
4
|
| Number of properties held for sale | property |
50
|
| Estimated expected sales proceeds |
$ 372,000
|
| Number of properties not epected to recover from estimated net sales proceeds | property |
9
|