Deferred Charges And Other Assets (Details) (USD $) In Thousands | Sep. 30, 2011 | Dec. 31, 2010 |
|---|---|---|
| Deferred Charges And Other Assets [Abstract] | ||
| Deferred leasing costs | $ 254,959 | $ 241,281 |
| Deferred financing costs | 20,163 | 20,149 |
| Deferred charges, gross | 275,122 | 261,430 |
| Accumulated amortization | (125,383) | (120,580) |
| Deferred charges, net | 149,739 | 140,850 |
| In-place lease values, related intangible and other assets, net | 31,230 | 41,155 |
| Prepaid expenses and other assets, net | 36,881 | 30,033 |
| Total deferred charges and other assets, net | $ 217,850 | $ 212,038 |