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Consolidated Statements Of Equity And Perpetual Preferred Units (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Common share options exercised 504,838 141,213 18,521
Cash distributions per share $ 1.96 $ 1.80 $ 2.05
Common Shares Of Beneficial Interest [Member]
      
Common shares issued 1,751,000 4,868,000 10,350,000
Conversions and redemptions of operating partnership units, shares 66,000 279,000 139,000
Additional Paid-In Capital [Member]
      
Common shares issued 1,751,000 4,868,000 10,350,000
Common share options exercised 68,000 41,000 19,000
Conversions and redemptions of operating partnership units, shares 66,000 279,000 139,000
Distributions In Excess Of Net Income [Member]
      
Cash distributions per share $ 1.96 $ 1.8 $ 2.05
Treasury Shares, At Cost [Member]
      
Common share options exercised 68,000    
Noncontrolling Interests [Member]
      
Conversions and redemptions of operating partnership units, shares 66,000 279,000 139,000
Cash distributions per share $ 1.96 $ 1.8 $ 2.05