v2.4.0.6
Notes Payable, Unsecured Notes and Credit Facility (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Notes Payable, Unsecured Notes and Credit Facility    
Total notes payable and unsecured notes $ 3,362,573 $ 3,600,025
Total mortgage notes payable, unsecured notes and Credit Facility 3,362,573 3,600,025
Amount of debt discount 1,553 1,802
Debt basis adjustment 0 11
Amount of debt premium 1,344 962
Unsecured notes
   
Notes Payable, Unsecured Notes and Credit Facility    
Fixed rate notes 1,451,601 1,556,001
Variable rate notes   75,000
Total notes payable and unsecured notes 1,451,601  
Mortgage notes payable
   
Notes Payable, Unsecured Notes and Credit Facility    
Fixed rate notes 1,534,037 1,528,783
Variable rate notes 376,935 440,241
Total notes payable and unsecured notes $ 1,728,313