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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 authorized	100,000	100,000
Shares of beneficial interest, shares issued	66,066	65,870
Shares of beneficial interest, shares outstanding	66,066	65,870

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The valuation allowance as of the balance sheet date to reduce the gross amount of receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet.

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Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

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