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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data
Sep. 30, 2011
Dec. 31, 2010
Consolidated Balance Sheets [Abstract]  
Rents and other receivables, allowance for doubtful accounts$ 8,122$ 7,422
Shares of beneficial interest, par value$ 0.01$ 0.01
Shares of beneficial interest, shares authorized100,000100,000
Shares of beneficial interest, shares issued66,06665,870
Shares of beneficial interest, shares outstanding66,06665,870