Recent Transactions (Rental Property Held for Sale, Net) (Narrative) (Details)
$ in Thousands, ft² in Millions |
3 Months Ended |
9 Months Ended |
12 Months Ended |
|
Sep. 30, 2016
USD ($)
ft²
item
property
|
Sep. 30, 2016
USD ($)
ft²
item
property
|
Dec. 31, 2015
property
|
| Real Estate Properties [Line Items] |
|
|
|
| Unrealized losses on properties held for sale |
|
$ (24,393)
|
|
| Number of properties sold | property |
|
|
6
|
| Sales proceeds |
|
$ 452,183
|
|
| Multi-Family Properties [Member] |
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
| Number of units | item |
5,214
|
5,214
|
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
| Estimated expected sales proceeds |
$ 113,000
|
|
|
| Assets held for sale, Deferred charges and other assets |
7,600
|
$ 7,600
|
|
| Assets held for sale, Unbilled rents receivable, net |
5,600
|
5,600
|
|
| Assets held for sale, Accounts payable, accrued expenses and other liabilities |
2,900
|
2,900
|
|
| Assets held for sale, Rents received in advance and security deposits |
$ 2,800
|
2,800
|
|
| Expected assets to be written off |
|
12,500
|
|
| Expected liabilities to be written off |
|
$ 2,800
|
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Office [Member] |
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
| Area of property (in square feet) | ft² |
1.8
|
1.8
|
|
| Number of properties held for sale | property |
14
|
14
|
|