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Consolidated Statements Of Equity And Perpetual Preferred Units Consolidated Statements Of Equity and Perpetual Preferred Units (Parentheticals) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Common shares issued 555 11,192 1,751
Common share options exercised 183,871 468,839 504,838
Conversions and redemptions of operating partnership units 2 558 66
Cash distributions declared to equity holders per share $ 2.52 $ 2.24 $ 1.96
Additional Paid-In Capital
      
Common share options exercised 0 0 68