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Schedule III - Real Estate And Accumulated Depreciation (Changes In Total Real Estate Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Schedule III - Real Estate And Accumulated Depreciation [Abstract]      
Balance, beginning of period $ 5,647,677 $ 5,461,626 $ 5,455,834
Acquisition   238,885  
Development 180,028 21,798 36,495
Improvements 61,037 44,405 35,377
Classification from held for sale     9,518
Cost of real estate sold contributed to joint venture (12,578) (119,037) (3,345)
Cost of real estate sold, other (32,673)    
Impairment     (72,253)
Classification to held for sale (23,951)    
Balance, end of period $ 5,819,540 $ 5,647,677 $ 5,461,626