Recent Transactions (Summary Of Income From Property Held For Sale, Net) (Details) - USD ($) $ in Thousands |
Jun. 30, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | ||
| Less - Accumulated depreciation | $ (1,072,029) | $ (1,087,083) |
| Rental property held for sale, net | 56,419 | $ 171,578 |
| Paramus, Hamilton And Rochelle Park, New Jersey And White Plains, New York [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | ||
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | ||
| Land | 13,472 | |
| Buildings and improvements | 87,969 | |
| Less - Accumulated depreciation | (44,522) | |
| Less: Unrealized losses on properties held for sale | (500) | |
| Rental property held for sale, net | $ 56,419 |