Tenant Leases (Details) - Jun. 30, 2015 - USD ($) $ in Thousands |
Total |
|---|---|
| Property Subject to or Available for Operating Lease [Line Items] | |
| July 1 through December 31, 2015 | $ 223,162 |
| 2016 | 441,825 |
| 2017 | 392,032 |
| 2018 | 308,731 |
| 2019 | 250,839 |
| 2020 and thereafter | 997,712 |
| Total | $ 2,614,301 |
| 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 |