Recent Transactions (Summary Of Income From Property Held For Sale, Net) (Details) - USD ($) $ in Thousands |
Mar. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | ||
| Less - Accumulated depreciation | $ (1,055,562) | $ (1,087,083) |
| Rental property held for sale, net | 38,566 | $ 171,578 |
| Paramus And Rochelle Park [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 | 12,428 | |
| Buildings and improvements | 55,809 | |
| Less - Accumulated depreciation | (29,671) | |
| Rental property held for sale, net | $ 38,566 |