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Consolidated Balance Sheets (Parenthetical) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Rental properties, accumulated depreciation $ 369,854,000 $ 335,116,000
Common Shares, par value $ 0.01 $ 0.01
Common Shares, shares authorized 75,000,000 75,000,000
Common Shares, shares issued 48,286,473 48,062,593
Preferred Shares, par value $ 0.01 $ 0.01
Preferred Shares, shares authorized 25,000,000 25,000,000
Treasury Shares, common shares 1,445,434 1,335,879
Series C Preferred Shares [Member]
   
Preferred Shares, shares issued 5,400,000 5,400,000
Preferred Shares, liquidation preference 135,000,000 135,000,000
Series D Preferred Shares [Member]
   
Preferred Shares, shares issued 4,600,000 4,600,000
Preferred Shares, liquidation preference 115,000,000 115,000,000
Series E Preferred Shares [Member]
   
Preferred Shares, shares issued 3,450,000 3,450,000
Preferred Shares, liquidation preference $ 86,250,000 $ 86,250,000