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Noncontrolling Interests on the Company's Consolidated Financial Statements (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Noncontrolling Interest (Textuals) [Abstract]          
Changes to noncontrolling interest $ 0 $ 0 $ 0 $ 0  
Percentage of general partnership interest owned by the company in the Operating Partnership 97.10% 96.70% 97.10% 96.70% 96.80%
Common limited partnership interest rate 2.90% 3.30% 2.90% 3.30% 3.20%
Common units outstanding 1,718,131 1,723,131 1,718,131 1,723,131 1,723,131
Conversion ratio of common units for common stock 1   1    
Common stock, par value $ 0.01   $ 0.01   $ 0.01
Number of trading days     10    
Aggregate value upon redemption of outstanding noncontrolling common units $ 66.6   $ 66.6   $ 61.4
Series A Preferred Units [Member]
         
Temporary Equity [Line Items]          
7.45% Series A cumulative redeemable preferred units of the Operating Partnership issued 1,500,000   1,500,000   1,500,000
7.45% Series A cumulative redeemable preferred units of the Operating Partnership outstanding 1,500,000   1,500,000   1,500,000
Preferred units redemption value per unit $ 50.00   $ 50.00   $ 50.00