Tenant Leases (Future Minimum Rentals To Be Received Under Non-Cancelable Operating Leases) (Details) $ in Thousands |
12 Months Ended |
|---|---|
|
Dec. 31, 2017
USD ($)
| |
| Property Subject to or Available for Operating Lease [Line Items] | |
| 2018 | $ 362,261 |
| 2019 | 328,399 |
| 2020 | 296,227 |
| 2021 | 265,393 |
| 2022 | 237,020 |
| 2023 and thereafter | 951,264 |
| Total | $ 2,440,564 |
| Tenant Leases [Member] | |
| Property Subject to or Available for Operating Lease [Line Items] | |
| Operating leases with various expiration dates through year | Dec. 31, 2035 |
| Multi-Family Properties [Member] | |
| Property Subject to or Available for Operating Lease [Line Items] | |
| Lease period | 1 year |